Dispose MorphTargets

[arpu]

Hey,

is there a way to list MorphTargets and dispose this?

[donmccurdy]

Morph targets are associated with mesh primitives, so you can remove them like this:

import { prune } from '@gltf-transform/functions';

for (const mesh of document.getRoot().listMeshes()) {
  for (const prim of mesh.listPrimitives()) {
    prim.listTargets().forEach((target) => target.dispose());
  }
}

await document.transform(prune());

The prune() step will clean up any unused resources (e.g. vertex attributes) left behind by the removed morph targets.

You may additionally want to clean up any weights or names associated with the morph targets. Not all models will have these, but it doesn't hurt to check:

document.getRoot().listNodes().forEach((node) => node.setWeights([]));

document.getRoot().listMeshes().forEach((mesh) => {
  mesh.setWeights([])
  const extras = mesh.getExtras();
  delete extras.targetNames;
  mesh.setExtras(extras);
});

[arpu]

this works fantastic!

only problem i see now is the gltf Validation shows me:

MESH_INVALID_WEIGHTS_COUNT | The length of weights array (249) does not match the number of morph targets (0).

[donmccurdy]

Good point! I've added a few more notes to the previous answer. 👍

[arpu]

Thanks!

[arpu]

to fix this i use

for (const mesh of doc.getRoot().listMeshes()) {
                 if (mesh.getWeights().length > 0 )
                    mesh.setWeights([])
}