How to color only a part of a gltf model?

Questions
1

I have a gltf model of a skeleton. I want to only color the arm of skeleton how can i achieve that?

2

By either:

  1. applying proper UV mapping in Blender / other 3D software, then modifying the texture in three (ex. by using CanvasTexture.)
  2. applying vertex colors (low precision colouring, but easier than modifying textures.)
  3. applying proper UV mapping, then creating a custom shader than applies colors based on a separate mask texture.
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3

@mjurczyk , would you happen to have an example for methods 2 and 3. I am unable to understand what exactly is the method ?

4

Just adding one more option:

  1. If the meshes of the body parts in the GLTF model are individual subobjects, it is sufficient just to change the .color of the corresponding materials.
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5

Thank you ! I managed to get a similar solution to work. But had to look for a skeleton model which was made with individual subobjects and did something like this -

gltf.scene.traverse((node) => {
                    if (node.isMesh) {   
                        if (node.name == 'left_arm') {
                            applyVertexColors(node.geometry, new THREE.Color(0xff0000));
                            node.material = new THREE.MeshStandardMaterial({
                                vertexColors: true,
                                side: THREE.DoubleSide
                            });
                        }
}
}