SimplifyModifier not working, breaking the geometry and removing the materials

Questions
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1

Hello everyone.

I’m trying to apply A SimplifyModifier to an object, but when I applied the mesh goes crazy and gets all the materials removed.

Plus it does not apply any modifier to the mesh.

Pink avatar = Original
Black avatars = SimplifyModifier applied

image
image959×893 84.1 KB

This is how I’m trying to do it:

gltfLoader.load("avatar.gltf",(obj)=>{
    const model = obj.scene;
    model.traverse(  ( child )=>{
        if ( child.isMesh ) {
            const modifier = new SimplifyModifier();
            const count = Math.floor(child.geometry.attributes.position.count * 0.7);
            child.geometry = modifier.modify(child.geometry, count);
            child.material.envMap = envTexture;
        }
    });
});

What else have I tried?

  • To create a new THREE.Mesh() with the simplified geometry, instead of replacing it and assigned it to the original structure. But same behaviour happens, it does not get modified and it becomes material-less.
  • I tried to apply this same modifier to a much simpler mesh, because I thought that it could be a problem using a SkinnedMesh. But same behaviour happens, it does not get modified and it becomes material-less.

What could I be doing wrong? Am I missing something?

Thank you in advance.

1 Like
2

Where are you getting the SimplifyModifier from? My guess is that it’s outdated, and it’s expecting a legacy Geometry object, but GLTFLoader outputs a BufferGeometry object.

3

Nope. I’m using the SimplifyModifier from the latest release. Which is already using BufferGeometry.

Here is the link: https://threejs.org/examples/jsm/modifiers/SimplifyModifier.js

4

I added

child.material.flatShading = true;

And now I can tell that the Modifier is working, but it does not keep the Materials, nor weights.

image
image662×696 51.8 KB

I’m reading how the SimplifyModifier works and it seems it only works for the position attribute of the vertexes?

// this modifier can only process indexed and non-indexed geomtries with a position attribute
for ( const name in attributes ) {
     if ( name !== 'position' ) geometry.deleteAttribute( name );
}

So it basically removes all data information about: normal, uv, color, skinIndex, skinWeight

Is this due a constraint issue? or just lack of time to add full-support to the modifier?

1 Like