Material mix with vertex color: "_COLOR0" is added everytime you import the model

Describe the bug If you import the model which use vertex color, you’ll get that annoying “_COLOR0” - everytime you import it! So if you export/import it multiple times, you’ll end with something like

MyMaterialName_COLOR0_COLOR0

And don’t forget about material name limit in Blender…

MyMaterialName_COLOR0_COLOR0_<...>_COLO

And what if material name is very long initially?

Looooooooooooooooooooooooooo<...>oongName_CO

Is this a normal behavior? Why do we need that “_COLOR0” in material name?

[scurest]

Okay, cool. Patch is just

--- a/addons/io_scene_gltf2/blender/imp/gltf2_blender_material.py
+++ b/addons/io_scene_gltf2/blender/imp/gltf2_blender_material.py
@@ -33,8 +33,6 @@ class BlenderMaterial():
         name = pymaterial.name
         if name is None:
             name = "Material_" + str(material_idx)
-        if vertex_color is not None:
-            name += "_" + vertex_color
 
         mat = bpy.data.materials.new(name)
         pymaterial.blender_material[vertex_color] = mat.name

[scurest]

Is that the only reason we have to duplicate materials in Blender import?

Yes. (It sounds like in Three.js a material corresponds to a unique shader/pipeline.)

Let’s ask @julienduroure’s opinion. This got added as part of the initial fix for materials not being duplicated in #30.