get color information from mesh imported as .OBJ

The color information is present as a material - shows correctly in Rhino render mode. Is there a method to retrieve the color information at a location (i.e. vertex)? I tried saving the .OBJ with per vertex color. Importing still has the color as material, in this case there is per vertex color information but the values are always (255,255,255).

There must be a way (it renders) but I have not found anything in either this forum or the discourse.

hope someone can help

Replies to This Discussion

Permalink Reply by David Rutten on December 20, 2016 at 6:20am

Grasshopper doesn't understand textures or materials or UV-mapping. So if that's how the data is stored, you either can't extract it or you need some plugin.

Permalink Reply by Mark Bronson on December 20, 2016 at 8:05am

I was hoping to find how I might accomplish from python: is there a method from either rhinoscript or rhinocommon? Especially for rhinocommon I am only just beginning to find my way.

Permalink Reply by Andrew Heumann on December 24, 2016 at 3:28pm

You should be able to write a script to get the UV texture coordinates of the mesh vertices - and then map that back to the texture image being used. If you upload your OBJ (and associated materials/textures) I can try to write a sample.

Permalink Reply by Mark Bronson on December 25, 2016 at 3:55pm

Last week I stumbled across mention of "ComputeVertexColors" which seems to do the trick of loading the per vertex information. However, if you have time and know the incantation I would much like to know what the method of getting the texture mapping directly. The two files attached are (I believe) the complete .obj. (The .3dm with it imported is >5M so I cant upload)

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