Bug report on importing mesh.

[sparse-mvs-2]

I'm trying to bring in a mesh into kaolin, but I've discovered an issue with the kaolin.io.obj.import_mesh function. Specifically, import_mesh doesn't currently support OBJ files that include color information. If the OBJ file includes x, y, z, r, g, b values, the vertices in kaolin will contain RGB values.

[Caenorst]

Hi @sparse-mvs-2 , thank you for your interest in Kaolin. I quickly searched online and couldn’t find anything about per-vertex color in obj file format. Are those obj from a dataset?

[sparse-mvs-2]

Yes. I use my own obj data.

[Caenorst]

Did you use a specific tool to generate those obj? this doesn’t seem to be part of the file format

[sparse-mvs-2]

Usually it looks like this:

3dScannerApp.com

mtllib textured_output.mtl
usemtl material_0
v -0.076 0.029 0.105
v -0.075 0.029 0.106
v -0.075 0.029 0.105
v -0.079 0.032 0.111.

But sometimes we can save the vertex color in each vertex (meshlab for example), then it looks like this:

mtllib test.mtl
usemtl test
v -56.695043 -8.185406 60.642260 0.082353 0.070588 0.039216
v -56.715019 -8.233994 60.633708 0.054902 0.047059 0.027451
v -56.706481 -8.231190 60.617203 0.121569 0.098039 0.054902
v -56.709433 -8.236841 60.670990 0.054902 0.047059 0.027451
v -56.716883 -8.263700 60.642537 0.066667 0.058824 0.031373
v -56.771020 -8.515039 60.600675 0.149020 0.117647 0.066667
v -56.795522 -8.522240 60.615212 0.086275 0.074510 0.043137
v -56.726744 -8.326732 60.678377 0.066667 0.058824 0.035294
v -56.724959 -8.364430 60.640271 0.070588 0.058824 0.035294.

The first three are the coordinate and the last three are rbg values.

[Caenorst]

I think that's an interesting property to support, to be noted that this is not part of .obj standard. I'll have a look to add support if that's important for the community.