Unity imports .obj with extra material

I’m working in Blender and exporting an OBJ into Unity. I have one mesh with two different materials applied to it. However, when I import the OBJ into Unity, it creates a third material which is assigned to the first face of the mesh. This happens even when material generation is turned to ‘off’ (it still makes three slots for materials). Opening the OBJ and MTL files in Notepad confirms that Blender exports everything properly, with only two materials. I’m using all other default settings in the importer.

I haven’t even the slightest idea why this is happening beyond it being an importer bug. Has anyone seen/dealt with this before?

I have seen this type of thing. I simply stopped using OBJ and just use the .blend files, it seems to digest them well.

Hello,

I would like to reopen this issue with a similar problem.
I imported 2 separate OBJ files in blender that originated in Maya.
I saved them both in the same .blend file, rigged, applied material and animations.
Unity is still showing:

Materials

Size: 2

Element 0: Default-Material

Element 1: Default-Material

Attached are images of Blender’s materials panel and Vertex Groups panel.
It shows that I have only one (1) material and one (1) UVmap.
I even went as far as to remodel the weapon (second OBJ file) from a single vertex of the body of the character and delete the old "join"ed weapon.
It still shows 2 materials in Unity.

Is it possible that this was something that carried over from Maya and I can’t get rid of?

thanks,
Pete

As a possible workaround but by no means a solution, go into the UV/Image editor, and shift+x (un-link) all textures.

For some reason, and with no consistency textures linked here are sometimes associated with one or multiple meshes, then when Unity re-imports it creates a new slot for that texture as a material. These textures don’t need to be linked to a material in blender and need only exist and linked to the .blend file.

It can get annoying, which is why I’m here right now, trying to find a permanent solution!