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Fill Holes

Closes open boundaries. The method matters more than anything else here. A triangle fan is instant and fine on a small flat hole. Ear clipping copes with a concave outline. Minimal produces the few...

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Fill Holes node

The Fill Holes node

When to use it

Closes open boundaries. The method matters more than anything else here. A triangle fan is instant and fine on a small flat hole. Ear clipping copes with a concave outline. Minimal produces the fewest triangles. Smooth fill reconstructs a curved surface that carries on from the shape around it, and on an organic form it is the only one that looks right.

Run it after a crop, a Remove Geometry or a scan cleanup, then check with Mesh Health that the boundary count actually reached zero.

A hole that refuses to fill is usually not one loop. Two boundaries that touch at a pinch vertex read as a figure eight, so weld first. Press Fill Holes.

How to use it

  1. 1

    Wire the mesh into Mesh

  2. 2

    Pick a fill method

    Minimal handles most things; use Smooth on a large opening across a curved surface.

  3. 3

    Press Fill Holes

    Every patch gets flat face normals and a flat UV projection, so it will read as a facet against the surface around it until you recompute normals and lay its UVs out properly.

Pins

Pin Type Description
Mesh Mesh The mesh with holes in it.
Pin Type Description
Mesh Mesh The mesh with its boundary loops closed. Each patch inherits the material of the triangles around it.

Settings

Setting Type Description
Fill Method Choice How the patch gets triangulated.
Filter By Size True/False Skip holes with more boundary edges than Max Hole Edges. Off, a scan's whole open back gets sealed over along with the pinholes you were after.
Max Hole Edges Whole number Holes with more boundary edges than this are left open.
Constrain To Hole Interior True/False Keep the fill from touching any triangle outside the hole. Protects the surrounding mesh, at the cost of a patch that meets it more abruptly.
Interior Smoothness Number Trades smoothness inside the patch against staying close to the shape the first fill produced.
Remeshing Exterior Region Width Whole number How many rings of surrounding triangles get remeshed along with the patch. Only does anything when the fill is not constrained to the hole interior.
Smoothing Exterior Region Width Whole number How many rings outside the patch get smoothed too. Raise it to soften the seam where the patch meets the mesh.
Smoothing Interior Region Width Whole number How far in from the patch border the smoothing constraint fades out.
Fill Density Scalar Number Sets the patch's triangle size: the average edge length around the hole, divided by this. Higher gives you a denser patch.
Project During Remesh True/False Pull vertices back onto the fill surface while the patch is remeshed.

Available in Mesh Morpher Graph and Mesh Morpher Studio.