Studio and Graph

Introduction

Mesh Morpher builds and reshapes meshes with a node graph. You place nodes, wire them together, and each one does a single job: load a file, decimate, unwrap, sculpt, bake, write an FBX. The graph ...

Mesh Morpher builds and reshapes meshes with a node graph. You place nodes, wire them together, and each one does a single job: load a file, decimate, unwrap, sculpt, bake, write an FBX. The graph is the recipe, so the same sequence runs again tomorrow on a different asset without you repeating a single click.

This section documents the node library, node by node. There are over 300 of them across 41 categories, and every page here describes the pins, the settings and what the node actually does with them.

Two products, one node library

They are the same tool wearing two coats. The node library, the graph editor, the sculpt brushes, the Python stage and the .mmgraph file format are shared, so a graph built in one opens in the other. That is why one reference covers both.

Mesh Morpher Classic is a separate product: the original morph-target toolkit for Unreal Engine, with its own runtime module. It is not a node graph and it is not documented in this section.

What a graph is, and what it is not

A node is one operation. It has input pins on the left, output pins on the right, and a settings list you edit in the Details panel. Wires carry meshes, weight maps, textures, transforms, landmarks, deltas and plain numbers between them.

What surprises people coming from other node editors is that a graph is not a timeline and nothing runs continuously. There are two kinds of node and it is worth knowing which you are looking at:

Three more habits are worth forming early:

• Select a node to look at it. The viewport shows the output of whatever node is selected, so clicking your way down the chain is how you find the step that went wrong.
• Every node carries its own documentation. The book icon on a node opens View node documentation without leaving the app. These pages are the same material, indexed and cross-linked.
• Undo covers the whole graph. Wiring, node settings, sculpt strokes and paint are all one transactional history.

Finding your way around

The sidebar lists every category. If you know what you want to do but not which node does it, start here.

What you need to run it

Mesh Morpher checks your graphics device on startup and tells you plainly if something will hold it back - an integrated card sharing system memory, a driver on the known-problem list, or a driver old enough to have shader-compilation bugs. Sculpting and the GPU deformers need real graphics hardware; the rest of the library does not.

Next

Studio and Graph

Getting Started

Studio is a standalone Windows application. Nothing else has to be installed first.

Install and activate

The window

Five panels, arranged however you like. Window switches them; drag a tab to redock it.

Above them sit four menus - File, Edit, Window and Help - and the toolbar's New, Open, Save and Settings buttons.

Build your first graph

This one needs no files at all: Primitive arrives already carrying a mesh, so there is something to look at from the first click.

1. 1

   Start a new graph

   File > New Graph, or pick New empty graph in the welcome dialog.

2. 2

   Add a Primitive node

   Right-click anywhere on the canvas. The Add Node menu opens with the search box already focused - type primitive, then click Primitive.

   Select it and pick a shape in Details. The viewport fills in immediately, because Primitive is a reactive node: there is no button to press.

3. 3

   Wire a Sculpt Mesh node onto it

   Drag from Primitive's Mesh output pin and let go over empty canvas. The same menu opens, now filtered to Compatible with Mesh - so only nodes that can actually accept a mesh are offered. Choose Sculpt Mesh and it is placed and wired in one gesture.

4. 4

   Sculpt

   Select the Sculpt Mesh node, pick a brush from the tool column, and pull the geometry around in the viewport. Press Accept when you are happy - that is what commits the strokes to the node's output.

5. 5

   Write it out

   Drag from Sculpt Mesh's output, add Write FBX, then press its action button in Details and choose a destination. Export nodes never fire on their own - a graph should not write files while you are still editing it.

Three things that save an afternoon

Start from an example instead

The welcome dialog's Start from an example opens a set of complete, wired graphs that each solve one real job. Every one carries a note across the canvas telling you which button to press next, in order.

Saving and reopening

Graphs are .mmgraph files. File > Save writes one, File > Open reads one back, and File > Recent Files reopens the last few. The welcome dialog lists the same recents, so the graph you were working on yesterday is one click from launch.

Where to go next

Studio and Graph

Animation

• Delta Mush Animation (Experimental): Runs Delta Mush over every frame of an animation and bakes what it cleaned up into corrective morph targets the animation itself drives.
• Apply Animation Frame: Poses a skinned mesh at one moment in an animation and hands back that pose as a mesh.
• Load Animation (FBX): Imports an animation take out of an FBX file. The keys are stored in the graph itself, so the FBX can move or disappear afterwards and the graph still plays.
• Pose Animation Sequence: Scrub to a frame, pose the skeleton with the gizmo, and the edit is blended over neighbouring frames and cached on the Animation output until Save Animation Sequence writes it into an asset.
• Retarget Animation: Moves a whole animation take onto a different rig's bones, chain by chain, one retarget per frame of the take.

Studio and Graph › Animation

Delta Mush Animation (Experimental)

Editor-only node. Runs only in Mesh Morpher Graph inside the Unreal Editor, because it reads or writes Unreal Engine assets. Not available in the standalone Mesh Morpher Studio app.

When to use it

Editor only. Runs Delta Mush on every frame of an animation and bakes the corrections into morph targets driven by that animation, so the skinning fix ships with the asset instead of costing a deformer at runtime.

How to use it

1. 1

   Connect a rest-pose mesh and an Animation input (from a Load Animation node)

2. 2

   Configure Delta Mush settings

3. 3

   Click "Apply" to process the animation and create corrective morph targets

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Studio and Graph › Animation

Apply Animation Frame

Samples an animation at one moment, in seconds, and hands you the mesh deformed into that pose. From there it is an ordinary mesh: measure it, sculpt on it, bake it, compare it against another pose.

When to use it

Samples an animation at one moment, in seconds, and hands you the mesh deformed into that pose. From there it is an ordinary mesh: measure it, sculpt on it, bake it, compare it against another pose.

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Studio and Graph › Animation

Load Animation (FBX)

Imports an FBX animation take via the runtime-safe FBX wrapper.

Imports an FBX animation take via the runtime-safe FBX wrapper.

Additionally, in the editor, the node builds a transient Animation Sequence (+ its skeleton asset) from the keyframes and carries its path inside the same "Animation" struct for Delta Mush Animation Corrective.

How to use it

1. 1

   Set the FBX file path + axis/coordinate options on the details panel

2. 2

   The node imports + bakes the animation into the output pin

3. 3

   Wire "Animation" into an "Apply Animation Frame" node or a Delta Mush Animation Corrective node

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Studio and Graph › Animation

Pose Animation Sequence

Poses the skeleton at a chosen frame of an animation and writes the edit back into the bone keys, blended over Falloff Frames on each side of the posed frame and fading with distance. The selected ...

When to use it

Poses the skeleton at a chosen frame of an animation and writes the edit back into the bone keys, blended over Falloff Frames on each side of the posed frame and fading with distance. The selected range is a hard boundary the edit never crosses - narrow it to protect a section of the take regardless of how large the falloff is.

How to use it

1. 1

   Connect an Animation input (from a Load Animation node) and the rest rigged mesh the animation plays on

2. 2

   Select the node, scrub to a frame, pose the skeleton with the gizmo, Accept

3. 3

   Wire the Animation output into Save Animation Sequence to write it back into an asset

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Studio and Graph › Animation

Retarget Animation

Moves a whole animation take onto a different rig's bones, chain by chain - one retarget per frame of the source take.

When to use it

Moves a whole animation take onto a different rig's bones, chain by chain - one retarget per frame of the source take.

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Studio and Graph

Deltas

• Apply Deltas: Copies a shape change from one mesh onto another, even when the two meshes are built differently.
• Apply Deltas (Topo Match): Adds a stored set of vertex movements straight onto a mesh that has the same vertices in the same order.
• Get Deltas: Measures how far every vertex moved between two versions of the same mesh.
• Transfer Pose: Makes one character take another's pose from point and curve landmarks. Splines are limbs; points are joints. Rotation only - the source keeps its own lengths.

Studio and Graph › Deltas

Apply Deltas

You sculpted a change into one mesh and want that same change on a second mesh built from different geometry. Feed the second mesh into Mesh, the unsculpted reference into Target, and the sculpted ...

When to use it

You sculpted a change into one mesh and want that same change on a second mesh built from different geometry. Feed the second mesh into Mesh, the unsculpted reference into Target, and the sculpted one into Morphed Target.

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Studio and Graph › Deltas

Apply Deltas (Topo Match)

Adds a delta set straight onto a mesh, vertex for vertex. When the delta source and the target share vertex count and order, this is the one to use. It is exact, it costs nothing, and there is no c...

When to use it

Adds a delta set straight onto a mesh, vertex for vertex. When the delta source and the target share vertex count and order, this is the one to use. It is exact, it costs nothing, and there is no correspondence search to get wrong.

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Studio and Graph › Deltas

Get Deltas

Subtracts a base mesh from a sculpted one and hands you the per-vertex offsets. Apply Deltas (Topo Match) is the other half of the pair: this lifts a shape change off one mesh, that replays it on a...

When to use it

Subtracts a base mesh from a sculpted one and hands you the per-vertex offsets. Apply Deltas (Topo Match) is the other half of the pair: this lifts a shape change off one mesh, that replays it on another.

Wire the untouched mesh into Mesh and the sculpted one into Target. Both inputs need the same vertex count and the same vertex order.

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Studio and Graph › Deltas

Transfer Pose

Makes one character take another's pose from point and curve landmarks. Mesh is the source that gets posed, and its vertex count and layout survive. Target is the character whose pose you are match...

When to use it

Makes one character take another's pose from point and curve landmarks. Mesh is the source that gets posed, and its vertex count and layout survive. Target is the character whose pose you are matching; different topology is the whole point. Landmarks carry the correspondence: point pairs for joints, spline pairs for limbs, drawn on each mesh as it currently sits.

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Studio and Graph

Importers

• Load File Mesh: Reads a mesh off disk: FBX, OBJ, GLB, glTF, STL or PLY. Textures the file points at come in with it.
• Load Skeletal Mesh: Brings a Skeletal Mesh asset from your project into the graph, bones and skin weights included.
• Load Static Mesh: A Static Mesh asset out of your project, ready to edit. No bones come with it, so a rigged character wants Load Skeletal Mesh instead.
• Load Animation Sequence: Pick an Animation Sequence out of the project and its keyframes land on the Animation output, copied into the graph so the graph keeps working without the asset around.
• Load Geometry Cache: Pulls a Geometry Cache asset out of the project so the graph can read its frames.
• Load Alembic File: Opens an Alembic (.abc) cache from disk. Frames are read as you ask for them, so a long cache never has to sit in memory all at once.
• Load USD File: Opens a USD file (.usd, .usda or .usdc) and streams its frames in. You can point it at one branch of a big scene instead of pulling in the lot.

Studio and Graph › Importers

Load File Mesh

Available in Mesh Morpher Graph and Mesh Morpher Studio.

How to use it

1. 1

   Set the file path and import settings on the node's details panel

2. 2

   Downstream consumers (sculpt / repair / exporter) read that struct

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Studio and Graph › Importers

Load Skeletal Mesh

Editor-only node. Runs only in Mesh Morpher Graph inside the Unreal Editor, because it reads or writes Unreal Engine assets. Not available in the standalone Mesh Morpher Studio app.

When to use it

The skeletal half of Load Static Mesh, editor only for the same reason. It brings a project Skeletal Mesh in with its bones and skin weights attached, which is what Pose Mesh, Paint Skin Weights and every skeleton node need before they will do anything at all.

How to use it

1. 1

   Pick a skeletal mesh asset

2. 2

   Set LOD index / import-vs-render data

3. 3

   Output is the mesh with skeleton data

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Studio and Graph › Importers

Load Static Mesh

Editor-only node. Runs only in Mesh Morpher Graph inside the Unreal Editor, because it reads or writes Unreal Engine assets. Not available in the standalone Mesh Morpher Studio app.

When to use it

Editor only. Pulls a Static Mesh that is already in your project into the graph as an ordinary mesh wire. Nothing gets decoded again, and the asset path travels along with the mesh, so Bake Mesh can write your edits back into that same asset later.

Use Import Data decides how the round trip ends. On, you get the original imported geometry, which is what a bake needs. Off, you get the built render data for the LOD you picked, already welded and optimised, which is what the engine actually draws.

How to use it

1. 1

   Pick a static mesh asset

2. 2

   Set LOD index / import-vs-render data

3. 3

   Output is the mesh data

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Studio and Graph › Importers

Load Animation Sequence

Editor-only node. Runs only in Mesh Morpher Graph inside the Unreal Editor, because it reads or writes Unreal Engine assets. Not available in the standalone Mesh Morpher Studio app.

Editor-only authoring node that picks a project Animation Sequence asset.

Additive sequences are not supported.

1. 1

   Pick an animation sequence asset in the details panel

2. 2

   Wire the Animation output into Apply Animation Frame or Delta Mush Animation Corrective

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Studio and Graph › Importers

Load Geometry Cache

Editor-only node. Runs only in Mesh Morpher Graph inside the Unreal Editor, because it reads or writes Unreal Engine assets. Not available in the standalone Mesh Morpher Studio app.

When to use it

Reads a Geometry Cache asset already in your project as a streaming pin. This is the project-asset counterpart to Load Alembic File and Load USD File, and its frames arrive already oriented for MeshMorpher, so there is nothing to convert.

How to use it

1. 1

   Pick a geometry cache asset

2. 2

   Wire the StreamingCache output onward

   Into Geometry Cache Sculpt, Get Streaming Geometry Cache Frame, or an export node.

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Studio and Graph › Importers

Load Alembic File

The way an animated cache from Maya, Houdini or 3ds Max gets into a graph. It streams: frames come off disk as something downstream asks for them, so a thousand-frame cache costs about what one fra...

When to use it

The way an animated cache from Maya, Houdini or 3ds Max gets into a graph. It streams: frames come off disk as something downstream asks for them, so a thousand-frame cache costs about what one frame costs.

There is no Load button. Pick a file and it reads, and it reads again the moment you change any setting below, so getting the orientation right is a matter of nudging Preset or Rotation and looking at the result.

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Studio and Graph › Importers

Load USD File

The USD counterpart to Load Alembic File. It streams a stage's frames in as something downstream asks for them, so scene length costs you nothing up front.

When to use it

The USD counterpart to Load Alembic File. It streams a stage's frames in as something downstream asks for them, so scene length costs you nothing up front.

What it adds over the Alembic loader is Prim Filter Path and the purpose switches. A production stage carries far more than the one character you want, in several detail levels at once, and those settings are how you take the branch you need and leave the rest on disk.

There is no Load button. Pick a file and it reads, and it reads again the moment you change any setting below.

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Studio and Graph

Exporters

• Write OBJ: Writes the mesh out as an OBJ with a matching .mtl beside it. It can pair the triangles back into quads on the way out.
• Write DNA: Saves the incoming MetaHuman DNA out to a .dna file, for backup or for handing to another character.
• Export To Skeletal Mesh: Makes a new Skeletal Mesh asset in your project from the incoming mesh. Hand it no skeleton and it builds one from the mesh's own bones.
• Export DNA To Skeletal Mesh: Turns MetaHuman DNA into a Skeletal Mesh asset with its joints, skin weights, morph targets and physics set up. Needs the MetaHuman Character plugin enabled in the project.
• Bake Mesh: Writes your edits back into the asset the mesh came from, along with its skeleton, DNA, other LODs and bound grooms. The mesh has to have come in through Load Skeletal Mesh or Load Static Mesh.
• Write FBX: Saves the incoming mesh as an FBX. Its textures land in a folder next to the file and get wired into the materials, so move the FBX and you have to take that folder with it.
• Write GLB: Packs the mesh, its bones and its base colour textures into one .glb you can hand straight to a web or realtime viewer. Normal and roughness maps do not make the trip.
• Export Geometry Cache to Alembic: Writes an animated cache out to an .abc file one frame at a time, so a long cache costs no more memory than a short one.
• Export Geometry Cache to USD: Sends an animated cache to a USD file, a frame at a time. Save as .usdc for the compact binary, .usda if you want to be able to open it in a text editor.
• Export to Geometry Cache: Bakes an animated cache, sculpt included, into a Geometry Cache asset in your project. The vertex count has to hold steady across every frame.
• Export to Texture Asset: Saves the texture on its input pin into a real project asset, so a map you baked here survives after you close the app.
• Write Alembic: Writes one still shape to an .abc with every UV set, which is what a modelling handoff to Maya, Houdini or ZBrush wants. For a moving sequence use Export Geometry Cache to Alembic instead.
• Write IMG: Writes the connected texture out as an image file. You pick the location and the format each time.
• Write PLY: Binary PLY carrying positions, normals and vertex colours. This is the format scanning and point-cloud tools trade in.
• Write STL: Shape only, in the binary STL that 3D printers and CAD tools read. UVs, colours, materials and skeleton all get dropped on the way out.
• Write USD: Writes one still shape to a USD file with every UV set, its vertex colours and shaded materials. For a moving sequence use Export Geometry Cache to USD instead.
• Save Animation Sequence: Writes the Animation pin's bone keys into a live Animation Sequence asset - the pin only ever caches edits, this is what materializes them. Editor only.
• Write Animation FBX: Saves the incoming animation's skeleton and its bone keyframes as an FBX - including any in-graph pose edits already baked into the wire.

Studio and Graph › Exporters

Write OBJ

OBJ out, optionally with a sibling MTL, and with quads preserved if the mesh has them.

When to use it

OBJ out, optionally with a sibling MTL, and with quads preserved if the mesh has them.

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Studio and Graph › Exporters

Write DNA

Saves the upstream DNA payload to a .dna file on disk. Snapshot a DNA partway through a chain, hand one to another tool, or keep a backup before a Bake DNA Geometry.

When to use it

Saves the upstream DNA payload to a .dna file on disk. Snapshot a DNA partway through a chain, hand one to another tool, or keep a backup before a Bake DNA Geometry.

It writes what is on the wire and nothing else. If the DNA needed fixing, that had to happen upstream; this node has no opinion about the contents.

How to use it

1. 1

   Connect the DNA input

2. 2

   Click Write DNA and choose a destination

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Studio and Graph › Exporters

Export To Skeletal Mesh

Editor-only node. Runs only in Mesh Morpher Graph inside the Unreal Editor, because it reads or writes Unreal Engine assets. Not available in the standalone Mesh Morpher Studio app.

When to use it

A new Skeletal Mesh asset out of a mesh that carries bone attributes, plus a skeleton asset too if you do not supply one.

For a rig built inside the graph by Auto-Rig, Skeleton Edit or Auto-Skin, with no source asset to bake back into, this is the way out. When there is a source asset, use Bake Mesh.

How to use it

1. 1

   Connect a mesh with bone data

2. 2

   Optionally set a skeleton in the settings

3. 3

   Click Export and choose the asset path

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Studio and Graph › Exporters

Export DNA To Skeletal Mesh

Editor-only node. Runs only in Mesh Morpher Graph inside the Unreal Editor, because it reads or writes Unreal Engine assets. Not available in the standalone Mesh Morpher Studio app.

When to use it

Turns a DNA into a fully set-up MetaHuman Skeletal Mesh asset: joints, base mesh, skin weights, morph targets, plus the archetype's physics, LOD settings and post-process anim blueprint. This is what makes a DNA usable in a level. Editor only.

How to use it

1. 1

   Connect DNA data

2. 2

   Select export type (Face/Body/Combined)

3. 3

   Click Export and choose the asset path

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Studio and Graph › Exporters

Bake Mesh

Editor-only node. Runs only in Mesh Morpher Graph inside the Unreal Editor, because it reads or writes Unreal Engine assets. Not available in the standalone Mesh Morpher Studio app.

When to use it

Editor only. Writes the edited geometry back into the project asset it came from, closing a Load Skeletal Mesh or Load Static Mesh round trip. It can take the reference skeleton, the skeleton asset, an attached DNA, re-projected morph targets, higher LODs and bound grooms along with it.

The Mesh input has to originate from one of those loader nodes, because that is where the asset path comes from. A mesh that came from a file import has nowhere to bake to, and the node will say so.

For a new asset instead of overwriting the source, Export Dynamic Mesh To Skeletal Mesh.

How to use it

1. 1

   Connect the modified mesh, tracing back to an asset loader

2. 2

   Choose what the bake should write

3. 3

   Click Bake Mesh

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Studio and Graph › Exporters

Write FBX

For a handoff to a DCC package where the rig has to survive, FBX is the format and this is the node. It goes out through the bundled FBX SDK.

When to use it

For a handoff to a DCC package where the rig has to survive, FBX is the format and this is the node. It goes out through the bundled FBX SDK.

How to use it

1. 1

   Connect a mesh to the Mesh input pin

2. 2

   Tweak axis / scale / ASCII settings on the details panel

3. 3

   Click Write FBX — choose a destination, file is written

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Studio and Graph › Exporters

Write GLB

One self-contained .glb: geometry, materials and textures all embedded. That is what a web viewer or a runtime asset pipeline wants.

When to use it

One self-contained .glb: geometry, materials and textures all embedded. That is what a web viewer or a runtime asset pipeline wants.

Against FBX, glTF wins when the destination is an engine or a browser and loses when it is a DCC package.

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Studio and Graph › Exporters

Export Geometry Cache to Alembic

Streams a whole geometry cache out to an .abc file, one frame at a time, so peak memory equals a single frame no matter how long the cache runs.

When to use it

Streams a whole geometry cache out to an .abc file, one frame at a time, so peak memory equals a single frame no matter how long the cache runs.

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Studio and Graph › Exporters

Export Geometry Cache to USD

The USD side of Export Geometry Cache to Alembic. A deforming cache streamed out to a USD file, one frame at a time.

When to use it

The USD side of Export Geometry Cache to Alembic. A deforming cache streamed out to a USD file, one frame at a time.

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Studio and Graph › Exporters

Export to Geometry Cache

Editor-only node. Runs only in Mesh Morpher Graph inside the Unreal Editor, because it reads or writes Unreal Engine assets. Not available in the standalone Mesh Morpher Studio app.

When to use it

Editor only. Bakes a streaming cache, with whatever sculpt or morph deltas are already riding on the pin, into a Geometry Cache asset in your project. Point it at an existing asset to replace its tracks in place, or leave the target empty and it asks where to put a new one.

This is the in-project counterpart to the Alembic and USD exports: those write a loose file for another application, this one leaves you an asset you can drop straight into a level or a sequence.

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Studio and Graph › Exporters

Export to Texture Asset

Editor-only node. Runs only in Mesh Morpher Graph inside the Unreal Editor, because it reads or writes Unreal Engine assets. Not available in the standalone Mesh Morpher Studio app.

When to use it

Saves the incoming texture into a project texture asset, either a new one at a path you pick or an existing one overwritten in place.

Every texture made inside the graph is transient and dies with the session: Load Texture, Transfer Texture, Tension Map. This is how one becomes real content that works outside the graph. For a loose file on disk instead, use Write Image.

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Studio and Graph › Exporters

Write Alembic

A single-sample poly mesh in an .abc archive, with every UV set. Alembic is at its best as a modelling handoff to Maya, Houdini or ZBrush.

When to use it

A single-sample poly mesh in an .abc archive, with every UV set. Alembic is at its best as a modelling handoff to Maya, Houdini or ZBrush.

This is the static-asset counterpart to Export Geometry Cache to Alembic: that node bakes a deforming sequence, this one writes one shape.

How to use it

1. 1

   Connect a mesh to the Mesh input pin

2. 2

   Tweak the axis and scale settings

3. 3

   Click Write Alembic and choose a destination

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Studio and Graph › Exporters

Write IMG

Pops a save dialog and writes the connected texture to disk. The format follows the extension you type: PNG, JPEG, BMP, EXR.

When to use it

Pops a save dialog and writes the connected texture to disk. The format follows the extension you type: PNG, JPEG, BMP, EXR.

Getting a generated map out of the app as a file is what it is for: a bake, a projection, a tension map, a UV layout. If the image should become persistent project content instead, use Export to Texture Asset.

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Studio and Graph › Exporters

Write PLY

Binary little-endian PLY, the scan pipeline's interchange format. Positions, per-vertex normals, and per-vertex colours when the mesh has them.

When to use it

Binary little-endian PLY, the scan pipeline's interchange format. Positions, per-vertex normals, and per-vertex colours when the mesh has them.

Colour is the reason to pick PLY over OBJ or STL. It is the simplest format that round-trips vertex colour, which is how photogrammetry albedo travels before it becomes a texture.

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Studio and Graph › Exporters

Write STL

Binary STL, for 3D printing and CAD.

When to use it

Binary STL, for 3D printing and CAD.

Geometry only. No UVs, colours, materials or skeleton, and no vertex sharing either, so the file comes out large and the mesh arrives as loose triangles. If the destination is not a printer or a CAD tool, Write OBJ, Write PLY or Write GLB will serve you better.

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Studio and Graph › Exporters

Write USD

A static USD layer with every UV set, vertex colours and UsdPreviewSurface materials, which is what a USD-native pipeline expects to receive for a prop or a character.

When to use it

A static USD layer with every UV set, vertex colours and UsdPreviewSurface materials, which is what a USD-native pipeline expects to receive for a prop or a character.

One shape is all this writes. A deforming sequence out of a streaming cache goes through Export Geometry Cache to USD instead.

How to use it

1. 1

   Connect a mesh to the Mesh input pin

2. 2

   Tweak the axis, scale and material settings

3. 3

   Click Write USD and choose a destination

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Studio and Graph › Exporters

Save Animation Sequence

Editor-only node. Runs only in Mesh Morpher Graph inside the Unreal Editor, because it reads or writes Unreal Engine assets. Not available in the standalone Mesh Morpher Studio app.

When to use it

Writes the bone keys on an Animation pin into a live Animation Sequence asset. Editor only. This is the materialize step for Pose Animation Sequence, whose Accept only ever caches the edit on the wire.

How to use it

1. 1

   Wire the Animation pin

2. 2

   Leave Target Sequence empty to write back into the sequence the animation came from (or create one), or pick a specific asset

3. 3

   Click Save Animation Sequence

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Studio and Graph › Exporters

Write Animation FBX

Write FBX exports a mesh. This exports the animation instead - the skeleton plus its bone keyframes, read straight off the Animation wire, so whatever a Pose Animation Sequence node baked into thos...

When to use it

Write FBX exports a mesh. This exports the animation instead - the skeleton plus its bone keyframes, read straight off the Animation wire, so whatever a Pose Animation Sequence node baked into those keyframes upstream comes along with it. Use this when the take itself is the deliverable; use Write FBX when you need geometry.

There is no file-path pin - the Write FBX button pops the save dialog itself, same as the mesh exporter.

How to use it

1. 1

   Connect an animation to the Animation input pin

2. 2

   Tweak axis / scale / ASCII settings on the details panel

3. 3

   Click Write FBX — choose a destination, file is written

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Studio and Graph

Cage Deformer

• Generate Cage: Builds a coarse cage that wraps the input mesh, ready to hand to the Cage Deformer.
• Cage Deformer: Reshapes a dense mesh by dragging the points of a coarse cage that surrounds it.

Studio and Graph › Cage Deformer

Generate Cage

Press Generate Cage, then feed the result into the Cage Deformer's Cage input. Density and the two smoothing settings are what you tune. It runs on the GPU and needs one that supports compute shaders.

Press Generate Cage, then feed the result into the Cage Deformer's Cage input. Density and the two smoothing settings are what you tune. It runs on the GPU and needs one that supports compute shaders.

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Studio and Graph › Cage Deformer

Cage Deformer

Reshapes a dense mesh by dragging the points of a coarse cage around it.

Reshapes a dense mesh by dragging the points of a coarse cage around it.

Select the node and the cage appears in the viewport with the mesh inside it. Move a cage point and the mesh follows smoothly. This is the tool for broad proportion work like head size or limb length, the kind of change that turns into lumps when you push a high-resolution surface around by hand.

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Studio and Graph

MetaHuman DNA

• Load DNA File: Reads a .dna file off disk so the other DNA nodes can work on it.
• Load DNA: Pulls the MetaHuman DNA out of a skeletal mesh so the other DNA nodes can read it.
• DNA To Mesh: Builds the mesh a DNA file describes, with its skeleton and skin weights, at the LOD you pick.
• Get DNA Blendshape: Applies one of the DNA's blendshape targets to a mesh so you can see the shape it makes.
• Get DNA Expression: Poses the DNA's mesh at one named expression and tells you which bones that expression moves.
• Set DNA Expression: Records a mesh you re-posed by hand back into the DNA as one of its expressions.
• Set DNA Blendshape: Writes a sculpted shape back into the DNA as one of its blendshape targets, and optionally onto the coarser LODs too.
• Bake DNA Geometry: Makes your sculpted mesh the DNA's new neutral shape, so every expression in the file then runs on top of your sculpt.
• Get DNA RBF Pose: Isolates a single pose from one of the DNA's RBF solvers, so you can see what that corrective does and which joints it drives.
• Set DNA On Skeletal Mesh: Attaches a DNA onto a Skeletal Mesh asset. Works with the legacy DNA storage below engine 5.8 and the new DNA asset format on 5.8 and above. Editor only.
• Set DNA RBF Pose: Records a corrective back into one of the DNA's RBF poses: the trigger rotations, the solver's RBF parameters and the corrected joint pose.
• Validate DNA: Checks a MetaHuman DNA for the damage that makes a rig deform wrongly without ever throwing an error. The DNA passes through untouched and the verdict comes out on pins.
• Create DNA: Builds a new MetaHuman-shaped DNA from a mesh - create, author a rig from scratch for a head, face or body.
• Create DNA From Skeletal Mesh: Builds a new MetaHuman-shaped DNA directly from a Skeletal Mesh asset - create, author a rig from scratch for a head, face or body.
• Edit DNA Animated Map: Adds, renames, sets LOD membership on, appends a driving row to, or removes an animated map - RigLogic's own conditional-table shape, authoring side.
• Edit DNA Blendshape Channel: Adds, renames, edits LOD membership, wires or removes a blend shape channel, or drops one target row - the identity/wiring authoring counterpart to Set DNA Blendshape.
• Edit DNA Expression: Adds, renames, wires or removes raw controls (expressions) - the DNA entities joint groups, blend shape channels, animated maps and RBF solvers drive from.
• Edit DNA GUI Control: Adds, edits, renames or removes a GUI control's raw-control mapping rows - RigLogic's own conditional table, authoring side only.
• Edit DNA LODs: Drops a DNA down to a subset of its LODs, or appends new LODs cloned from an existing one - edit, keep, add, remove, drop LOD.
• Edit DNA ML: Adds or removes ML controls and removes neural networks - a network's own weights/layers are authored only by the Python verb add_neural_network.
• Edit DNA PSD: Adds, replaces or removes PSD correctives - controls computed as the weighted product of their own factor controls.
• Edit DNA RBF Pose: Adds or removes RBF poses and RBF pose controls on a DNA's corrective layer - the trigger/output structure, not the corrected joint pose itself.
• Edit DNA RBF Solver: Adds or removes whole RBF solvers on a DNA - drivers, settings and LOD membership; pads stay hidden and are managed automatically.
• Edit DNA Twist Swing: Adds, edits or removes twist/swing parameter-group setups - the quaternion-driven joint corrective tables RigLogic evaluates, authoring side only.
• Get DNA GUI Controls: Lists a DNA's GUI controls and evaluates one control's effect on the rig controls it drives, the same way RigLogic computes it.
• Merge DNA: Combines a body DNA and a head/face DNA into one DNA - merge, combine body and head/face into a single rig.
• Pose DNA Controls: Poses a DNA's mesh from a sparse set of GUI control values, evaluated through the DNA's own RigLogic rig - the same slider values a MetaHuman face/body board would drive.
• Transfer DNA Rig: Transfers a rig - face expressions, RBF, twist/swing, joint behavior - from a template DNA onto a target DNA that already has its own geometry and skeleton, via a hand-editable bone mapping.

Studio and Graph › MetaHuman DNA

Load DNA File

This is how you get at a DNA that is not sitting inside a skeletal mesh yet.

When to use it

This is how you get at a DNA that is not sitting inside a skeletal mesh yet.

How to use it

1. 1

   Browse to a .dna file

2. 2

   Wire the DNA output onward

   Into DNA To Mesh, Get DNA Expression, Bake DNA Geometry, or any other DNA node.

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Studio and Graph › MetaHuman DNA

Load DNA

Editor-only node. Runs only in Mesh Morpher Graph inside the Unreal Editor, because it reads or writes Unreal Engine assets. Not available in the standalone Mesh Morpher Studio app.

When to use it

Pulls the MetaHuman DNA out of a skeletal mesh so the rest of the DNA nodes can read it. Handles both the newer MetaHuman Character storage and the older one, so you do not have to know which your character was made with.

How to use it

1. 1

   Pick a skeletal mesh that carries DNA

2. 2

   Wire the DNA output onward

   Into DNA To Mesh, Get DNA Expression, Bake DNA Geometry, or any other DNA node.

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Studio and Graph › MetaHuman DNA

DNA To Mesh

Builds the mesh a DNA file describes, in its neutral shape, with the DNA's own skeleton and skin weights on it. This is the mesh you sculpt on before baking anything back.

When to use it

Builds the mesh a DNA file describes, in its neutral shape, with the DNA's own skeleton and skin weights on it. This is the mesh you sculpt on before baking anything back.

How to use it

1. 1

   Wire a DNA in

2. 2

   Pick the LOD you want

   0 is the densest.

3. 3

   The Mesh output is the mesh, ready to edit

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Studio and Graph › MetaHuman DNA

Get DNA Blendshape

One named blendshape target out of a DNA, as a mesh, optionally filtered to the expression that uses it. Good for inspecting or re-sculpting a single shape. For the combined result an animator woul...

When to use it

One named blendshape target out of a DNA, as a mesh, optionally filtered to the expression that uses it. Good for inspecting or re-sculpting a single shape. For the combined result an animator would actually see, Get DNA Expression.

Use the expression filter. A DNA carries hundreds of blendshapes, and without it the dropdown is a wall of names you have to read end to end.

How to use it

1. 1

   Wire a DNA in, and the mesh from DNA To Mesh into Mesh

2. 2

   Pick a blendshape

   Filter by expression first if the list is unwieldy.

3. 3

   The Mesh output is the same mesh with that shape on it

   The mesh you feed in has to be the same mesh at the same LOD, with the same vertex count. Anything else and the node stops with a count mismatch.

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Studio and Graph › MetaHuman DNA

Get DNA Expression

One named expression, evaluated out of a DNA with all its blendshapes combined and the skeleton deformation applied, handed back to you as a mesh. Turned all the way on, so you can see what a contr...

When to use it

One named expression, evaluated out of a DNA with all its blendshapes combined and the skeleton deformation applied, handed back to you as a mesh. Turned all the way on, so you can see what a control actually does before you change it.

Seeing, sculpting on or comparing an expression is what it is for. For one shape in isolation rather than the combined result, use Get DNA Blendshape.

Set DNA Expression closes the loop.

How to use it

1. 1

   Wire a DNA in

2. 2

   Pick an expression and an LOD

3. 3

   Mesh is the posed mesh

   Bones tells you which joints that expression drives.

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Studio and Graph › MetaHuman DNA

Set DNA Expression

Bakes a modified expression mesh back into the DNA by solving what per-joint deltas would produce it. The write half of Get DNA Expression.

When to use it

Bakes a modified expression mesh back into the DNA by solving what per-joint deltas would produce it. The write half of Get DNA Expression.

The pairing is strict. Edit the mesh that Get DNA Expression produced, at the same LOD, without changing its vertex count or order, or the solve has nothing to correspond against.

When you meant to change one named shape rather than a whole expression, Set DNA Blendshape.

How to use it

1. 1

   Pose the expression with Get DNA Expression, then move its bones

2. 2

   Wire that mesh into Mesh and the same DNA into DNA

3. 3

   Pick the expression to overwrite and press Set Expression

   The mesh must still carry the DNA's own bone names. If the skeletons do not line up, nothing is written.

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Studio and Graph › MetaHuman DNA

Set DNA Blendshape

Replaces or adds one blendshape target in a DNA from a mesh you supply, and can propagate it down the LOD chain. Pair it with Get DNA Blendshape, keeping vertex layout and LOD identical between the...

When to use it

Replaces or adds one blendshape target in a DNA from a mesh you supply, and can propagate it down the LOD chain. Pair it with Get DNA Blendshape, keeping vertex layout and LOD identical between the two, or the deltas come out against the wrong base.

How to use it

1. 1

   Wire the DNA in

   Put the unsculpted mesh on Mesh and your sculpted copy on Target.

2. 2

   Pick the blendshape to overwrite

3. 3

   Press Set Blendshape

   The DNA output carries the new deltas. Mesh and Target must have the same vertex count and order, and both must match the DNA's own mesh at that LOD. Sculpt on a copy of DNA To Mesh, do not retopologise it.

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Studio and Graph › MetaHuman DNA

Bake DNA Geometry

Writes edited mesh and skeleton data back into a DNA, optionally propagating the change to higher LODs and carrying morph targets along. This ends the round trip that DNA To Mesh starts, the way Ba...

When to use it

Writes edited mesh and skeleton data back into a DNA, optionally propagating the change to higher LODs and carrying morph targets along. This ends the round trip that DNA To Mesh starts, the way Bake Mesh ends a mesh round trip.

How to use it

1. 1

   Build the mesh with DNA To Mesh, sculpt it, wire it into Mesh

2. 2

   Set LOD Index to the LOD you built from and pick what to write

3. 3

   Press Bake DNA

   Keep the vertex count the same and the bake is exact. Change it and the DNA meshes are rebuilt from scratch, which is when Transfer Morph Targets and Quad Export start to matter and LOD propagation stops working. Rename or add bones and the bake refuses outright: the joint names on your mesh have to be the ones the DNA already knows.

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Studio and Graph › MetaHuman DNA

Get DNA RBF Pose

One pose of one RBF solver inside a DNA, evaluated on its own, with the mesh and the bones that pose drives.

When to use it

One pose of one RBF solver inside a DNA, evaluated on its own, with the mesh and the bones that pose drives.

How to use it

1. 1

   Wire a DNA in

2. 2

   Pick a solver

   The pose list refills to match it.

3. 3

   Read the three outputs

   Mesh is the fire pose plus this pose's joint-group column, the same conversion Get DNA Expression uses. Trigger is the fire pose only, ready to wire into Set DNA RBF Pose's Trigger. Bones tells you which joints the pose's column drives.

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Studio and Graph › MetaHuman DNA

Set DNA On Skeletal Mesh

Editor-only node. Runs only in Mesh Morpher Graph inside the Unreal Editor, because it reads or writes Unreal Engine assets. Not available in the standalone Mesh Morpher Studio app.

When to use it

Writes a DNA onto a Skeletal Mesh asset, the same slot Load DNA reads back out. Feed it from Load DNA File, Bake DNA Geometry, or any DNA chain, pick the Skeletal Mesh to write into, and press Set DNA On Skeletal Mesh.

It replaces whatever DNA the mesh had. On newer engines the DNA is stored as the mesh's MetaHuman DNA Data; on older ones it uses the legacy storage, and you do not have to know which. The mesh is marked changed so a save keeps it.

How to use it

1. 1

   Wire a DNA in

2. 2

   Pick the Skeletal Mesh asset to write into

3. 3

   Press Set DNA On Skeletal Mesh

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Studio and Graph › MetaHuman DNA

Set DNA RBF Pose

Re-records one RBF pose of a DNA: the joint rotations that trigger it, the solver's RBF parameters, the pose's scale and name, and the corrected joint pose it applies. The write half of Get DNA RBF...

When to use it

Re-records one RBF pose of a DNA: the joint rotations that trigger it, the solver's RBF parameters, the pose's scale and name, and the corrected joint pose it applies. The write half of Get DNA RBF Pose.

How to use it

1. 1

   Isolate the pose with Get DNA RBF Pose, move its joints, wire that mesh into Mesh and the same DNA into DNA

2. 2

   Optionally wire a second mesh into Trigger to re-record which driver rotations fire the corrective. Unwired reads those drivers from Mesh

3. 3

   Pick the solver, then the pose

   The solver settings and pose scale load from the DNA when you pick, so what you see is what is stored.

4. 4

   Adjust anything you want changed and press Set RBF Pose

   This is bone work, not sculpting: it reads where the joints ended up, not where the vertices ended up. The mesh must still carry the DNA's own bone names — joints that do not line up are left untouched.

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Studio and Graph › MetaHuman DNA

Validate DNA

Inspects a MetaHuman DNA for structural defects, passes the DNA straight through, and publishes the verdict on pins. LOD index tables, joint hierarchy, RigLogic behaviour matrices, skin weights, ve...

When to use it

Inspects a MetaHuman DNA for structural defects, passes the DNA straight through, and publishes the verdict on pins. LOD index tables, joint hierarchy, RigLogic behaviour matrices, skin weights, vertex layouts, blendshape targets.

How to use it

1. 1

   Drop it anywhere in a DNA chain

   DNA in, DNA out, nothing is changed.

2. 2

   Read the findings in the details panel, worst first

   Each one says what breaks and where.

3. 3

   Branch on Is Sound to keep a broken DNA out of an export

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Studio and Graph › MetaHuman DNA

Create DNA

Builds a brand new MetaHuman-shaped DNA from a mesh: skeleton, skin weights and geometry, plus a structurally complete but functionally identity behavior layer underneath - no controls, no blendsha...

When to use it

Builds a brand new MetaHuman-shaped DNA from a mesh: skeleton, skin weights and geometry, plus a structurally complete but functionally identity behavior layer underneath - no controls, no blendshapes, so RigLogic evaluates it and nothing moves. This is a geometry-and-skeleton round trip, not a rig round trip. To edit an existing DNA and keep its rig, use Bake DNA Geometry instead.

How to use it

1. 1

   Wire your base mesh (bones + skin weights already on it, e.g. from a DNA To Mesh sculpt or an Auto Rig) into Mesh. It becomes LOD 0

2. 2

   Optionally wire coarser LODs into Additional LODs, element i becoming LOD i+1

3. 3

   Pick Body Part - it decides the db-name convention and the default mesh name, nothing geometric

4. 4

   Press Create DNA

   This is a geometry-and-skeleton round trip, not a rig round trip: the file this produces has no GUI controls and no blendshapes. Chain Create DNA → Set DNA Blendshape to author shapes on top of it.

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Studio and Graph › MetaHuman DNA

Create DNA From Skeletal Mesh

Editor-only node. Runs only in Mesh Morpher Graph inside the Unreal Editor, because it reads or writes Unreal Engine assets. Not available in the standalone Mesh Morpher Studio app.

When to use it

Create DNA's asset-picker-sourced sibling: the same build - skeleton, skin weights, geometry, plus a structurally complete but functionally identity behavior layer, and the same optional Scaffold Rig - built directly from a project Skeletal Mesh asset instead of a mesh pin. Editor only, the same reason Load Skeletal Mesh is: it reads the asset's mesh description, which a packaged build strips.

How to use it

1. 1

   Pick a Skeletal Mesh asset

2. 2

   Optionally list Keep LODs (empty imports every LOD the asset has; asset LOD i becomes DNA LOD i)

3. 3

   Pick Body Part - it decides the db-name convention and the default mesh name, nothing geometric

4. 4

   Optionally turn on Scaffold Rig to donate generic expressions/RBF/twist- swing from a template DNA - see the property's own tooltip

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Studio and Graph › MetaHuman DNA

Edit DNA Animated Map

Adds, renames, sets LOD membership on, appends a driving row to, replaces the rows of, or removes animated maps on a DNA - MetaHuman's eyeBlink / eyeLidTightener-style values, each driven by a raw ...

When to use it

Adds, renames, sets LOD membership on, appends a driving row to, replaces the rows of, or removes animated maps on a DNA - MetaHuman's eyeBlink / eyeLidTightener-style values, each driven by a raw control through the same [From, To] interval and Slope*x+Cut line a GUI control's own rows use - as an ordered list of operations applied atomically.

How to use it

1. 1

   Wire a DNA in

2. 2

   Build an ordered list of operations in the Operations panel below the properties

   Each entry picks Add / Rename / Set LODs / Add Row / Set Rows / Remove, a target/new name, and whichever of the LOD checkbox row / raw-control picker + From-To-Slope-Cut fields / rows table its own Op uses. Picking a map shows that map's own current rows (read-only) so Add Row's own "appends after this" is never a guess, and on a Set Rows entry also loads those rows into the rows table to edit (Load Rows From DNA does the same at any time). Untick an entry to keep it staged without running it.

3. 3

   Press Apply Animated Map

   Every enabled entry runs in order against the result of every earlier one - rename a map then Add Row on it in the very next entry and the row lands on the map under its new name. The whole batch is atomic: the first refusal publishes nothing at all, not even the operations before it.

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Studio and Graph › MetaHuman DNA

Edit DNA Blendshape Channel

Adds, renames, edits LOD membership, wires an expression to, removes outright, or drops one target row of a blend shape channel, as an ordered list of operations applied atomically - the identity/w...

When to use it

Adds, renames, edits LOD membership, wires an expression to, removes outright, or drops one target row of a blend shape channel, as an ordered list of operations applied atomically - the identity/wiring/removal authoring counterpart to Set DNA Blendshape, which only ever creates the inert channel from a sculpted mesh and writes its targets.

How to use it

1. 1

   Wire a DNA in

2. 2

   Build an ordered list of operations in the Operations panel below the properties

   Each entry picks Add / Rename / Set Lods / Wire Expression / Remove Channel / Remove Target, a target (Channel Name, or Mesh Name + Target Index for Remove Target), and whichever of New Name / the LOD checkboxes / Control Name apply to it. Untick an entry to keep it staged without running it.

3. 3

   Press Apply Blendshape Channel

   Every enabled entry runs in order against the result of every earlier one - rename a channel then wire it in the very next entry and the wire finds it under the new name. The whole batch is atomic: the first refusal publishes nothing at all, not even the operations before it.

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Studio and Graph › MetaHuman DNA

Edit DNA Expression

Adds, renames, wires or removes raw controls (expressions) on a DNA, as an ordered list of operations applied atomically - the authoring counterpart to whatever reads them (PSDs, joint groups, blen...

When to use it

Adds, renames, wires or removes raw controls (expressions) on a DNA, as an ordered list of operations applied atomically - the authoring counterpart to whatever reads them (PSDs, joint groups, blend shape channels, animated maps, RBF solvers, and Get DNA GUI Controls' own raw-control table).

How to use it

1. 1

   Wire a DNA in

2. 2

   Build an ordered list of operations in the Operations panel below the properties

   Each entry picks Add / Rename / Wire / Remove / Set Wiring / Unwire, a target, and whatever fields that op needs. Untick an entry to keep it staged without running it.

3. 3

   Press Apply Expressions

   Every enabled entry runs in order against the result of every earlier one - add a raw control then wire it in the very next entry and the wire finds it under its new name. The whole batch is atomic: the first refusal publishes nothing at all, not even the operations before it.

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Studio and Graph › MetaHuman DNA

Edit DNA GUI Control

Adds, edits, renames or removes GUI controls (MetaHuman face-board sliders) on a DNA, as an ordered list of operations applied atomically - the authoring counterpart to Get DNA GUI Controls, which ...

When to use it

Adds, edits, renames or removes GUI controls (MetaHuman face-board sliders) on a DNA, as an ordered list of operations applied atomically - the authoring counterpart to Get DNA GUI Controls, which only reads and evaluates.

How to use it

1. 1

   Wire a DNA in

2. 2

   Build an ordered list of operations in the Operations panel below the properties

   Each entry picks Add / Edit Rows / Rename / Remove, a target/new name, and (for Add / Edit Rows) a Mapping Rows table, the same [From, To] interval / Slope*x+Cut line RigLogic evaluates inside it. Picking a control on an Edit Rows entry replaces that entry's rows with what is currently on the DNA; Load Rows From DNA does the same at any time. Untick an entry to keep it staged without running it.

3. 3

   Press Apply GUI Control

   Every enabled entry runs in order against the result of every earlier one - rename a control then edit its rows in the very next entry and the edit finds it under the new name. The whole batch is atomic: the first refusal publishes nothing at all, not even the operations before it.

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Studio and Graph › MetaHuman DNA

Edit DNA LODs

Drops a DNA down to a subset of its own LODs, appends new LODs cloned from an existing one, or both in the same pass.

When to use it

Drops a DNA down to a subset of its own LODs, appends new LODs cloned from an existing one, or both in the same pass.

How to use it

1. 1

   Wire a DNA in

2. 2

   Keep LODs: list the LODs to keep, ascending, e.g. [0, 2] to keep only LOD 0 and LOD 2 (renumbered 0 and 1). Leave empty to keep every LOD

3. 3

   Add Cloned LODs: how many new LODs to append, each a byte-identical copy of Clone From LOD - "immediately valid, evaluates identically". Clone From LOD indexes the mesh after the keep-filter above, so -1 (the default) always means "the last LOD that survived the filter"

4. 4

   Press Apply LODs

   A dropped LOD's own meshes, blendshape targets and LOD-only behavior rows are gone - re-adding it later starts from whatever the DNA looks like then, not from what was dropped.

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Studio and Graph › MetaHuman DNA

Edit DNA ML

Adds or removes ML controls, and removes neural networks, on a DNA, as an ordered list of operations applied atomically - the wave-3 authoring counterpart to whatever a Get/Create DNA node can only...

When to use it

Adds or removes ML controls, and removes neural networks, on a DNA, as an ordered list of operations applied atomically - the wave-3 authoring counterpart to whatever a Get/Create DNA node can only read. A network's own weights and layers are authored only by the Python verb add_neural_network (a real layer needs its full weight/bias matrices, not a handful of Slate fields), so this node never adds one - do not go looking for that option here.

Operations is a list edited in the Operations panel below the properties: Add Operation appends an entry, and each entry has an enabled tick, an Op (Add ML Control / Remove ML Control / Remove Neural Network), a New Name box (Add ML Control), an ML control target (Remove ML Control, picked from a plain-name list), a Network target (Remove Neural Network, picked from a list labelled "net <i>: <in> in → <out> out, <layers> layer(s), LODs <list>" - a read-only info line under the card repeats it) and a Force Cascade tick (Remove ML Control), Up/Down/Remove. An unticked entry is skipped entirely (never validated) and reported as "skipped".

Apply ML runs every enabled entry in order, each resolved against the result of every earlier one - an ML control is targeted by its name, which stays correct across the batch even after an earlier entry adds or removes other controls (unlike a PSD's positional index); a network is targeted by its plain index, renumbered down by an earlier Remove Neural Network in the same batch exactly like a PSD's own Remove. This is atomic: the first entry that refuses publishes nothing at all, not even the operations before it, and Summary names exactly which entry and why. A pin change only updates Summary (ML control/network counts and one preview block per operation, including a live reference-cascade preview for Remove ML Control) without touching the DNA, the same pattern as Edit DNA PSD.

An ML control no neural network writes stays 0 at evaluation time - harmless, exactly like an unused raw control. Removing a referenced ML control (a PSD factor, a neural network's own input or output) refuses without Force Cascade; Summary lists every kind found before you press anything. Removing a neural network renumbers every later network's own index, its per-LOD membership lists and every mesh-region row that named it; Summary surfaces that renumbering plus, when this DNA carries the plugin's own mlbe op-graph section, whatever the cascade dropped from it.

How to use it

1. 1

   Wire a DNA in

2. 2

   Build an ordered list of operations in the Operations panel below the properties

   Each entry picks Add ML Control / Remove ML Control / Remove Neural Network, a New Name box (Add ML Control), an ML control picker (Remove ML Control), a Network picker (Remove Neural Network) and a Force Cascade tick (Remove ML Control). Untick an entry to keep it staged without running it.

3. 3

   Press Apply ML

   Every enabled entry runs in order against the result of every earlier one. The whole batch is atomic: the first refusal publishes nothing at all, not even the operations before it.

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Studio and Graph › MetaHuman DNA

Edit DNA PSD

Adds, replaces or removes PSD correctives on a DNA, as an ordered list of operations applied atomically - a PSD is a control computed as the weighted product of its own factor controls, the missing...

When to use it

Adds, replaces or removes PSD correctives on a DNA, as an ordered list of operations applied atomically - a PSD is a control computed as the weighted product of its own factor controls, the missing authoring counterpart to every PSD a Get/Create DNA node can only read.

How to use it

1. 1

   Wire a DNA in

2. 2

   Build an ordered list of operations in the Operations panel below the properties

   Each entry picks Add / Replace Factors / Remove, a Factors table (control + weight rows, Add / Replace) and, for Replace / Remove, a PSD target and a Force Cascade tick. Untick an entry to keep it staged without running it.

3. 3

   Press Apply PSD

   Every enabled entry runs in order against the result of every earlier one. The whole batch is atomic: the first refusal publishes nothing at all, not even the operations before it.

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Studio and Graph › MetaHuman DNA

Edit DNA RBF Pose

Adds or removes RBF poses and RBF pose controls on a DNA's corrective layer - the structural authoring counterpart to Get DNA RBF Pose, as an ordered list of operations applied atomically.

When to use it

Adds or removes RBF poses and RBF pose controls on a DNA's corrective layer - the structural authoring counterpart to Get DNA RBF Pose, as an ordered list of operations applied atomically.

How to use it

1. 1

   Wire a DNA in

2. 2

   Build an ordered list of operations in the Operations panel below the properties

   Each entry picks Add Pose / Remove Pose / Add Pose Control / Remove Pose Control. Add Pose needs a solver, a new name, a driver value per that solver's own driver control (sized automatically once you pick the solver) and, usually, at least one output. Untick an entry to keep it staged without running it.

3. 3

   Press Apply RBF Pose

   Every enabled entry runs in order against the result of every earlier one - add a pose control then wire a new pose's own Outputs at it in the very next entry and it resolves under the name that entry just created. The whole batch is atomic: the first refusal publishes nothing at all, not even the operations before it.

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Studio and Graph › MetaHuman DNA

Edit DNA RBF Solver

Adds or removes whole RBF solvers on a DNA, as an ordered list of operations applied atomically - drivers, the wire-format settings and LOD membership for Add; a poses policy (remove/keep) plus an ...

When to use it

Adds or removes whole RBF solvers on a DNA, as an ordered list of operations applied atomically - drivers, the wire-format settings and LOD membership for Add; a poses policy (remove/keep) plus an optional force cascade for Remove. Editing an existing solver's own 12 fields stays on Set DNA RBF Pose; this node only adds whole solvers or removes them.

How to use it

1. 1

   Wire a DNA in

2. 2

   Build an ordered list of operations in the Operations panel below the properties

   Each entry picks Add / Remove. Add needs a New Name, a Driver Controls table (raw controls, in order - the panel shows a live quartet badge next to it) and the solver settings; Remove needs a Solver picker (pads are hidden - they are never a valid target) plus Keep Poses / Force Cascade. Untick an entry to keep it staged without running it.

3. 3

   Press Apply RBF Solver

   Every enabled entry runs in order against the result of every earlier one - adding a solver then removing it again in the very next entry works. The whole batch is atomic: the first refusal publishes nothing at all, not even the operations before it.

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Studio and Graph › MetaHuman DNA

Edit DNA Twist Swing

Adds, edits (Set) or removes twist/swing parameter-group setups - the quaternion-driven joint corrective tables RigLogic evaluates - as an ordered list of operations applied atomically.

When to use it

Adds, edits (Set) or removes twist/swing parameter-group setups - the quaternion-driven joint corrective tables RigLogic evaluates - as an ordered list of operations applied atomically.

How to use it

1. 1

   Wire a DNA in

2. 2

   Build an ordered list of operations in the Operations panel below the properties

   Each entry picks Add / Set / Remove, Twist or Swing, and (Set / Remove) a Setup picked from the per-kind cache below it. Add and a flagged Set need the driver quaternion (exactly 4 raw controls, x/y/z/w), an Axis, and at least one output joint with a blend weight. Set only writes the fields ticked Set Axis / Set Inputs / Set Outputs - an untouched field keeps the setup's current value. Untick an entry to keep it staged without running it.

3. 3

   Press Apply Twist Swing

   Every enabled entry runs in order against the result of every earlier one. The whole batch is atomic: the first refusal publishes nothing at all, not even the operations before it - Summary names the failing entry.

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Studio and Graph › MetaHuman DNA

Get DNA GUI Controls

Lists every GUI control (slider) a DNA exposes and, for the one you pick, evaluates exactly what a chosen value on it drives - which raw controls, and at what values - computed the same way RigLogi...

When to use it

Lists every GUI control (slider) a DNA exposes and, for the one you pick, evaluates exactly what a chosen value on it drives - which raw controls, and at what values - computed the same way RigLogic's own conditional table would compute it.

How to use it

1. 1

   Wire a DNA in

2. 2

   Pick a control from the dropdown (lists every one, in DNA order, regardless of the pick)

3. 3

   Set Control Value and read Inspection (in the details panel) to see exactly what that control drives and how far

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Studio and Graph › MetaHuman DNA

Merge DNA

Combines a body DNA and a head/face DNA into one DNA: every joint, control, mesh and behavior table renumbered into a single index space, with the shared-by-name joints (head, neck01, neck02 and th...

When to use it

Combines a body DNA and a head/face DNA into one DNA: every joint, control, mesh and behavior table renumbered into a single index space, with the shared-by-name joints (head, neck_01, neck_02 and the rest of the chain they hang off) collapsed to one entry each. This is index-space concatenation, not a geometric re-fit - a MetaHuman-family pair is already authored pre-aligned in one world space, so nothing needs to move.

How to use it

1. 1

   Wire a body DNA into Body DNA and a head/face DNA into Head DNA

2. 2

   Read Report and Shared Joints in the details panel - they update on every pin change without running the merge itself

3. 3

   Press Merge Now

   A precondition refusal leaves DNA empty; Report says exactly why.

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Studio and Graph › MetaHuman DNA

Pose DNA Controls

Poses a DNA's mesh from a sparse set of GUI control values - only the ones you have moved off zero - evaluated through the DNA's own RigLogic rig: GUI-to-raw mapping, corrective and machine-learned...

When to use it

Poses a DNA's mesh from a sparse set of GUI control values - only the ones you have moved off zero - evaluated through the DNA's own RigLogic rig: GUI-to-raw mapping, corrective and machine-learned behaviour, joints, blendshapes and animated maps, exactly as the rig would compute them, then publishes the posed mesh.

How to use it

1. 1

   Wire a DNA in

2. 2

   Open the details panel and move sliders

   Releasing one (or pressing Enter) reposes; dragging does not, so a fast pose stays fast.

3. 3

   Mesh is the result; Bones and Pose Summary (in the details panel) say what actually moved

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Studio and Graph › MetaHuman DNA

Transfer DNA Rig

Donates a rig - generic face expressions, RBF, twist/swing, joint behavior - from a template DNA onto a target DNA that already has its own geometry, skeleton and identity behavior, without rebuild...

When to use it

Donates a rig - generic face expressions, RBF, twist/swing, joint behavior - from a template DNA onto a target DNA that already has its own geometry, skeleton and identity behavior, without rebuilding it from a mesh. The same transfer Create DNA's own Scaffold Rig option runs, as its own node - use this to (re-)donate a rig onto a DNA you already have.

How to use it

1. 1

   Wire the DNA that should receive the rig into Target DNA (it keeps its own geometry/skeleton/neutrals - only rig layers are donated onto it)

2. 2

   Wire the rig donor into Template DNA

3. 3

   Optionally turn on Retarget Values to also convert the donated values so a target joint sitting in a different local frame than its template counterpart still gets a correct rig - off is the existence-only transfer, byte-identical to what Create DNA's own Scaffold Rig has always shipped

4. 4

   Edit Bone Mapping if the target's bone names do not match the template's (prefilled automatically; Auto-Map / Clear force a full re-map / empty it)

5. 5

   Press Transfer Now

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Studio and Graph

Geometry

• Append Geometry: Merges a second mesh into the first and brings its material slots along, with a choice of how the added geometry picks up skin weights.
• Remove Geometry: Deletes the masked triangles and cleans up after itself, tidying the skin weights.
• Subdivide: Adds density by splitting triangles, curving the new points to follow the surface. Paint a weight map to only split part of the mesh.
• OpenSubdiv: Smooths a mesh by subdividing it, the same way a subdivision surface works in a modelling package.
• Remesh: Rebuilds the surface out of evenly sized triangles at a length you pick. Reach for it when a sculpt or a scan has left stretched, tangled geometry that fights every deformer you put after it.
• Stitch: Pulls the open border of one mesh onto the open border of another so the two meet with no gap between them. Only the first mesh moves.
• Blend: Slides a mesh part way toward a second shape, with an optional weight map to limit where it happens. Both meshes need the same vertex count.
• Weld: Stitches open edges back together wherever two vertices sit almost on top of each other, closing splits and seams left by an import or a cut.
• Recompute Normals: Rebuilds the normals from the shape the mesh is in now. Drop it in after anything that moved vertices, when the shading has stopped matching the surface.
• Replace Geometry: Swaps everything on one material slot for a different piece of geometry, then re-weights the new part off the mesh it landed in. Change a head, a hand or a plate of armour without touching the rest.
• Delta Mush (Experimental): Cleans up the crumpling and volume loss that skinning leaves around joints, then puts the sculpted surface detail back by reading it off the rest pose.
• Change Attribute Domain (Vertex ↔ Triangle): Moves a stored value between per-vertex and per-triangle, combining values by average, area-weighted average, minimum or maximum.
• Convert To Static Mesh: Builds a static mesh out of the incoming mesh so nodes that expect one can take it. The result is rebuilt each time the graph loads rather than saved to disk.
• Fix Intersections: Pushes vertices apart until the mesh stops passing through itself, or through a collision surface you wire in.
• Generate LODs: Builds a whole LOD chain from one mesh in a single step, keeping UV islands, material sections and polygroups intact at every level.
• Get Attribute: Pulls a named value stored on the mesh back out as a weight map, so masks, blends and weight-map math can get at it. The dropdown lists whatever the connected mesh is actually carrying.
• Guided Delta Mush: Relax the noisy parts of a scan and leave everything else bit-for-bit alone.
• Primitive: Builds a box, sphere, plane, disc, cylinder, cone, capsule or torus from numbers alone, with UVs and normals already set up. Nothing to wire in, and sizes are in world units.
• Retopologize: Rebuild a dense scan or sculpt as clean quads. Draw strokes on the surface to say which way the edge loops should run, let the field settle, then press Accept.
• Set Attribute: Stores a named number on every vertex or triangle: one constant, or per-vertex values from the Weights input.
• Simplify: Cuts a dense mesh down to a triangle or vertex count you pick, leaving its UV islands, material sections and polygroups where they are. Press Simplify to run it.
• Transfer Attribute: Copies a stored value from the Source mesh onto the Target mesh, matching vertex for vertex when the counts agree and by proximity when they do not. The node tells you which of the two it used.
• Wrangle: The escape hatch. Write a short program and it runs once per vertex, per triangle, per corner, per texel, or once for the whole mesh. When no node does the thing you want, this does.
• Language and control flow: Statements, operators, types, loops and your own functions.
• Channels and attributes: P, N, uv, Cd and the rest, per domain, plus the @attributes you name yourself and the mesh-wide constants.
• Parameters: The inputs you declare on the node: floats, vectors, weight maps, ramps, transforms and deltas.
• Scalar and vector functions: Maths on numbers and on vectors, plus the integer and debug helpers.
• Noise: Deterministic simplex noise: the same input gives the same value on every run and every machine.
• Neighbours, transforms and distance: Walking the one-ring, moving points and frames around, and geodesic distance across the surface.
• Donor mesh pins: Reading a second mesh by pin name: positions, normals, attributes, nearest points and ray hits.
• Textures and landmarks: Sampling a Texture pin, and reading or writing a Landmarks pin.
• MetaHuman DNA: Reading a MetaHuman DNA by pin name from the expression: joints, meshes, blend shapes, controls and skin weights.
• Run modes: Texel and Corner: What one run corresponds to in the two per-element modes that are not Vertex or Triangle, and what each one may touch.
• Run mode: Detail: The mode that runs once for the whole mesh, and the only one that may add or remove geometry.
• Arrays: Growable lists of floats or vectors, local to one run of the expression.
• Skin weights and viewport: Reading and writing the mesh's real skin weights, and drawing debug geometry in the viewport.
• Python stage: The #@python blocks in the code editor: when they run, what they can reach, and how they hand values to the expression.
• Python API: Everything on the mm object, plus the mm.ui buttons and labels a script can declare.
• Examples: The ready-made recipes the code editor's own Examples menu inserts, expression and Python side by side.

Studio and Graph › Geometry

Append Geometry

Clothing, a prop, a repaired patch. This merges a second mesh into the first and handles the awkward parts on the way: skin weights, skeleton merging, material slot remapping.

When to use it

Clothing, a prop, a repaired patch. This merges a second mesh into the first and handles the awkward parts on the way: skin weights, skeleton merging, material slot remapping.

How to use it

1. 1

   Connect the base mesh and the mesh to append

2. 2

   Pick how the added geometry gets its weights

3. 3

   The output is the combined mesh

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Studio and Graph › Geometry

Remove Geometry

Deletes the triangles the connected selection marks, rebuilding skin weights and material slots so what is left is still a usable asset. Cropping a scan, dropping an unwanted accessory, cutting a r...

When to use it

Deletes the triangles the connected selection marks, rebuilding skin weights and material slots so what is left is still a usable asset. Cropping a scan, dropping an unwanted accessory, cutting a region out before a replacement gets appended.

Holes where you wanted a clean edge are normal. Follow with Fill Holes or Stitch Mesh.

How to use it

1. 1

   Connect the mesh and a triangle selection

2. 2

   Click Apply to remove the selected geometry

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Studio and Graph › Geometry

Subdivide

Splits every triangle to raise resolution, with optional smoothing and reprojection back onto the original surface so the detail does not get rounded off. Good when you need more vertices for a def...

When to use it

Splits every triangle to raise resolution, with optional smoothing and reprojection back onto the original surface so the detail does not get rounded off. Good when you need more vertices for a deformation or a bake and want to keep the existing vertex layout, skin weights and morph targets.

For proper Catmull-Clark smoothing of a low-poly cage, that is OpenSubdiv. For even triangle sizes rather than more of the same triangles, Remesh.

Levels multiply. Each one quadruples the triangle count, so level 3 on a 500k mesh is 32 million triangles and no amount of patience will save you.

How to use it

1. 1

   Connect the source mesh

2. 2

   Set the subdivision level and the smoothing options

3. 3

   Click Subdivide Mesh

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Studio and Graph › Geometry

OpenSubdiv

Subdivides mesh geometry with Pixar's OpenSubdiv, producing a smoother surface at a higher polygon count. This is the node for proper Catmull-Clark smoothing of a low-poly cage.

When to use it

Subdivides mesh geometry with Pixar's OpenSubdiv, producing a smoother surface at a higher polygon count. This is the node for proper Catmull-Clark smoothing of a low-poly cage.

For more triangles without the smoothing, use Subdivide. For even triangle sizes rather than more of the same triangles, use Remesh.

How to use it

1. 1

   Connect the input mesh

2. 2

   Set the subdivision level

   Higher means more polygons.

3. 3

   Click Apply to subdivide

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Studio and Graph › Geometry

Remesh

Rebuilds the surface with evenly sized triangles at a target edge length. When a mesh has to deform well under a sculpt, a wrap or delta mush, and its triangles are wildly uneven, this is the fix.

When to use it

Rebuilds the surface with evenly sized triangles at a target edge length. When a mesh has to deform well under a sculpt, a wrap or delta mush, and its triangles are wildly uneven, this is the fix.

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