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I have a .OBJ file with vertex colors like:

g Model
o Cubo.005
mtllib temp.mtl
usemtl 12212233866733520400
v 28.0000 -4.0000 -66.0000 0.007 0.039 0.560
v 28.0000 -4.0000 -65.0000 0.007 0.039 0.560
v 28.0000 -3.0000 -65.0000 0.007 0.039 0.560
...

and a .MTL file with

newmtl 12212233866733520400
Ka 1.000000 1.000000 1.000000
Kd 1.000000 1.000000 1.000000
Ks 0.000000 0.000000 0.000000
Tr 1.000000
illum 1
Ns 0.000000
map_Kd temp12212233866733520400.png

Here map_Kd references a PNG texture which when the .OBJ is imported results in:

enter image description here

I can confirm that the vertex colors are there inside the Color Attributes tab within the Object Data Properties section, but they are not used in the defined material. How do I edit the .MTL so the material will reference those vertex colors after importing? Currently I have to manually replace the Texture Node with the Color Attribute node.

enter image description here

I tried removing the line map_Kd temp12212233866733520400.png but then nothing is plugged into the BSDF when importing the obj.

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1 Answer 1

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You can't. OBJ vertex colors have no effect on MTLs or materials.

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  • 1
    $\begingroup$ i feared that was the case. well that means i will just write a python script that will create my needed setup after object import. thank you! $\endgroup$
    – Harry McKenzie ♦
    Commented Jan 28 at 23:51

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