Mudbox > Blender > Unity = Workflow Issue ( Ghosted Materials )

cody.rauh

Hey guys,

Another day another issue, lol.

So I am building out my models, texturing them in mudbox, exporting them to blender to merge and re-unwrap uv's, then sending the asset into unity for testing.

Here is my issue. If you look to the left you see I have selected a single mesh, on a modulated 4 mesh tower. But you will also see it has 7 materials assigned to it.



You will however see in the next image there is in face a single material assigned to each mesh. All other materials have been removed from the properties of the object.



I am using the texturing method used by Brian Burell, with his helicopter tutorial. Everything in mudbox must be modulated for painting.

I use blender to then take all my pieces and make them into a single mesh object on a single texture.

Anyone know why there are ghosted materials? It seems they carry into mudbox to, as if i go back to generate normals or ambient maps with my new merged low poly model it will spit out multiple of the same texture, named with a heiarchy of..

material1_uv1
material1_uv2
material1_uv3
and so on...

Yet I have also merged my uvs, and deleted all other uv properties from my object. Extremely confused, there is only a single set of uv's per mesh now, but still receiving this ghost effect.

Any help is appreciated, cheers!

cody.rauh

Additionally just reducing the material size for each mesh in Unity. where is shows the 7 materials, causes parts of the mesh to go invisible from the scene.

cody.rauh

[Resolved]

Due to the way blender exports.. you cannot export the model after the merge, and re-import it to remove the extra materials without the materials ghosting.

mAlkAv!An

Blender creates additional materials on export when using multiple textures. Before export, select all faces of each material and assign the same texture in the UV/Image editor, this should fix it.

cody.rauh

I found that out right before I went to post about it in the thread. cause ran into the same issue again today with another mesh. Wish I would have seen your post last night, lol.

Thank you Malkav!an

SkyWay

I feel like this needs to be clarified a bit, sorry if not.
Blender creates materials for every texture applied into a mesh within the UV/Image editor during export. It also exports the actual materials applied to a mesh, in Blenders Material tab. Personally I use the materials as then I can preview stuff nicely with the GLSL shading, I just have to remember that whenever I edit UVs with a texture applied to the editing window I need to unlink the texture there after I'm done. You can also select every polygon in the mesh, apply a texture in the UV editor and then unlink that. This ensures that there are no additional materials created during export/import.