# How does Blender deal with partially textured .obj object?

I have a .obj file that specifies a partially textured object. More specifically, not all vertices have UV coordinates (that is, I have more v entries than vt entries in my .obj).

The face entries f look like this.

f 2045/631 2164/742 2119/700
f 2119/700 2164/742 2165/743
f 2259/834 2120/701 2165/743
f 2165/743 2120/701 2119/700
f 2260 2261 2259
f 2259 2261 2120
f 2205 2262 2124


As you can see, some faces are textured, while others are not.

My model looks reasonable in MeshLab -- it has some faces with texture and some textureless faces.

However, when I import the .obj file into Blender, the faces that are supposed to be textureless have a texture, which is the entire texture map. Why is this happening, and how can I stop this behavior?

• I think that is blender's way of "resetting" a uv map. I would grab all the untextured faces and set their uvs to be collapsed on a single point on whatever software you used to make the mesh. I can't think of any simple solution since the blender obj importer is fairly simple with not many options. – Sebastián Mestre Mar 28 '17 at 0:57
• @SebastiánMestre Thanks! I see. Probably I will just set the untextured face's UV to (0, 0)? Let me try it now. – Sibbs Gambling Mar 28 '17 at 1:00
• @SebastiánMestre This kinda works in the sense that the untextured faces are uniform now, but they are of a certain color, the color of the point where I set their UV to... It would be wonderful if there is a better solution, but your solution is really handy. Thanks mate! – Sibbs Gambling Mar 28 '17 at 1:12
• No problem! i had the same problem a few months ago. A dirty fix for that new problem would be to have a few white pixels on your image and place the UVs there. Not very elegant and it adds some extra work but it's better than having half of your mesh be red (or whatever color the point where the uvs are is). I tend to keep the background of WiP textures white so it is not an extra step for me but "your mileage might vary" – Sebastián Mestre Mar 28 '17 at 1:24
• @SebastiánMestre Maybe you could write a quick answer that I can mark accepted? Would love to help more people. :-D – Sibbs Gambling Mar 28 '17 at 1:28