Studio and Graph › Sculpt Tools
Brush Settings
Size, strength, falloff and the rest of the shared brush controls, including how brush radius is actually computed.
The Brush pill in the viewport toolbar holds the settings every brush shares, in three groups: Size, Stroke and Advanced. They apply no matter which brush is active.
Size
| Setting | What it does | Default | Range |
|---|---|---|---|
| Size | "Brush radius in world units." | 0.25 | min 0, no max |
| Specify Radius | "Use the explicit radius instead of the auto-fit size." | off | - |
| Radius | "Half-extent of the affected region in world units." | 10 | min 0, deliberately no max |
Size is a fraction until you turn Specify Radius on. With Specify Radius off, Size is not a world-space number - it is a 0 to 1 fraction remapped against the mesh's own bounding box: radius = 0.5 * lerp(MaxDim * 0.01, MaxDim, Size), where MaxDim is the mesh's largest bounding-box dimension. At Size 0 that is half of 1% of MaxDim, at Size 1 it is half of MaxDim itself. That is why the same Size value gives you a small brush on a small prop and a huge one on a building - it scales with whatever you are sculpting. Turn Specify Radius on and the Radius field is used exactly as typed, in world units, so it stays comparable between meshes.
Stroke
| Setting | What it does | Default | Range |
|---|---|---|---|
| Step Size | "Minimum spacing between brush samples along a stroke." | 0.001 | min 0 |
| Strength | "Effect intensity applied per pass." | 0.5 | min 0, UI max 5 |
| Smooth Strength | "Strength of the smoothing applied while holding Shift (and by the Smooth tool)." | 0.6 | 0-1 |
| Smooth Iterations | "Number of smoothing passes applied per Shift stamp (and by the Smooth tool)." | 3 | 1-8 |
| Depth | "How far below the surface the brush pushes." | 0.0 | unbounded |
| Falloff | "Curve controlling brush strength from center to edge." | 0.5 | 0-1 |
| Falloff Type | "Falloff type." | Smooth | see below |
| Spacing | "Distance between brush stamps along a stroke, as a fraction of brush size - the "Spacing" control in Photoshop / Krita / Blender. 0 = continuous: the brush applies every frame, so holding it still keeps building up at the same spot (default). Higher values lay a discrete, frame-rate-independent stamp trail with gaps between stamps." | 0.0 | clamp 0-2, UI 0-1 |
| Lazy Mouse | "Stabilize the stroke: the brush trails the cursor on a string and only advances when the cursor moves beyond the lazy radius." | off | - |
| Lazy Mouse Radius | "Lazy-mouse string length as a fraction of brush size." Shown only when Lazy Mouse is on. | 0.5 | clamp 0-4, UI 0-2 |
| Update Vertex Selection | "When ON, the brush's affected region re-collects under the cursor as you drag, so the working set follows the stroke. When OFF, the region is fixed at the point where the stroke started and every stamp keeps re-applying to that same spot. Drag-style brushes (Move/Grab) always translate their captured set by the live cursor, so this flag only changes how stamp-style brushes (Sculpt/Inflate/Smooth/Pinch/Flatten/...) behave." | on | - |
Depth is only used by a couple of tools - it acts as an inward crease bias on Pinch, and it sinks the capture centre below the surface for Grab and Move. Other brushes ignore it.
Advanced
| Setting | What it does | Default | Range |
|---|---|---|---|
| Only Facing Camera | "Only affect vertices that face the camera." Hidden when Only Connected is on. | off | - |
| Only Connected | "Only affect vertices reachable from the brush center." | off | - |
| Angle Threshold | "Maximum angle between neighbours allowed when walking." 180 means the walk never stops. Shown only when Only Connected is on. | 180.0 | - |
| Walk Stops At UV Seams | "Stop the connectivity walk at UV seams. OFF by default: most meshes have UV seams everywhere, and a seam cutting through the middle of the brush pins one side while the other moves - visible spikes/tears. Opt in when you genuinely want UV islands isolated." Shown only when Only Connected is on. | off | - |
| Walk Stops At Normal Seams | "Stop the connectivity walk at hard normal seams (same caveat as UV seams)." Shown only when Only Connected is on. | off | - |
Falloff types
The Falloff Type dropdown offers eight shapes: Smooth, Linear, Inverse, Round, Box Smooth, Box Linear, Box Inverse, Box Round.
The four round falloffs share one shape: everything within (1 - Falloff) * Radius of the brush centre is at full strength, then a ramp to the edge:
| Falloff Type | Profile from the full-strength core to the edge |
|---|---|
| Smooth | cubic ease (w^3) |
| Linear | straight ramp (w) |
| Inverse | cubic of the linear weight |
| Round | circular ease (1 - t^2) |
Box falloffs measure distance to an axis-aligned box in a surface-oriented frame instead of to the brush centre, so the footprint reads square rather than round. That box is still clipped to the brush sphere, so a Box brush has its eight corners sliced off and shows a hard step where the cut happens. Both are deliberate, not a bug.
Indicator pill
| Setting | What it does | Default |
|---|---|---|
| Indicator Thickness | "Outline thickness for the brush indicator." | 0.5 |
| Indicator Color | "Outline color for the brush indicator." | Black |
| Show Indicator Sphere | "Show the filled sphere around the brush center." | on |
| Indicator Sphere Color | "Color of the filled brush indicator sphere." | cyan |
| Indicator Sphere Alpha | "Transparency of the brush indicator sphere." | 1.0 |
The indicator only shows on a real mesh hit - it hides as soon as the cursor leaves the surface, and in marquee mode.
Material pill
General preview settings, grouped into Wireframe and Material.
| Setting | What it does | Default |
|---|---|---|
| Enable Wireframe | "Show the mesh wireframe over the surface." | off |
| Material Mode | "Preview material style used for the sculpt mesh." Values: Focus, Tension, Transparent, Mesh. | Mesh |
| Focus Color Mode | "How Focus mode colours the surface - Flat clay, per-section colours, or the mesh's own baked vertex colours. Shown only in Focus mode. Section Colors forces section boundaries even on meshes that carry vertex colours (which Vertex Colors would otherwise display)." Values: Flat (Clay), Section Colors, Vertex Colors. Shown only when Material Mode is Focus. | Flat (Clay) |
| Tension Compress Color | "Color shown where the surface is compressed." Tension mode only. | Red |
| Tension Stretch Color | "Color shown where the surface is stretched." Tension mode only. | Green |
| Tension Neutral Color | "Color shown where the surface is undeformed." Tension mode only. | Black |
| Transparent Color | "Tint used in transparent preview mode." Transparent mode only. | blue |
| Opacity | "Surface transparency, where 1 is fully opaque." Transparent mode only. | 0.65 (0-1) |
| Two Sided | "Render both faces of the preview material." Transparent mode only. | off |
Tension mode is live while you sculpt - the preview recomputes the tension colour after every deform. Focus and Tension modes also turn shadow casting off on the preview mesh.