Render Mesh + gradient with Vray

Hey,
another day, another problem, some more questions! :)

I want to render a mesh with Vray. Therefore I will use Giulios Piacentinos
bake attributes tool
But if I link my geometry to the component it doesn't work, the gradient out of 4 colors won't be mapped on the mesh, only one color. I also decomposed the mesh and rebuild it again. No solution!

If I use another method to map a gradient on the mesh (think it is done by TAZ) it works like the one overhere:But rendering the above one with Vray ends in a completele white object. If I render it with the Rhino or Raytraced Neon Plugin renderer it gives a good result. Ok why not doing it with them?! Because I want it to do with Vray, I prefer it.

Next step I tried, I made me some gradient colors as texture in the Vray Materials and want them to assign to the baked object. Rendering with Vray gives me the same result! only one color is on it.

Ok, last I tried was I took a rhino object and converted it to a mesh assigned the Vray gradient material on it and rendered it for testing and voilà it worked. In the pic below you can see the attempts. The two objects on the left use the same gradient as texture but only the cube is rendered like it should be, both are meshs voronoi is a GH mesh, cube is a Rhino mesh.

So my question, whyyyyyyy??? What is the difference between the baked mesh out of GH in compare to the one I did in Rhino? Do I have to do some further adjustements like mapping in rhino before doing it or, aah I don't know, ... it might be a little stupid thing but I would be thankfull for any answer cause it took me half the night and a bottle of wine trying to understand the problem.

And please a easy solution I got a headache don't know why! ;)

Thanks for any help!!! :)

I use Rhino 5 and a demoversion of the new Vray but the same problems exist in rhino 4 an the older Vray.

Replies to This Discussion

Permalink Reply by Sebastian L. on May 18, 2012 at 8:11am

Any news / ideas / solutions about this problem?

Permalink Reply by Michael Pryor on May 18, 2012 at 8:32am

as Hannes states, V-ray doesn't support mesh vertex color info, However I think that Brazil does. maybe?

Permalink Reply by Hannes Löschke on May 18, 2012 at 8:18am

Baking materials/Attributes only allows for one material. This will be a standard rhino material with Giulios'. Scarab bakes Maxwell Render materials. Both are currently limited to simple colors per object. mapped colors would require texture maps. Both current solutions don't support that.

Per vertex coloring of meshes is a viewport/Rhino/OpenGL feature, that is not supported by any 3rd party render engine, I'm aware of. (Maxwell will render default gray for colored meshes, which was one of my incentives to develop Scarab and somewhere in the future be able to bake my own texture maps) To render the colored meshes, the plugins would have to create a texture map for each mesh and convert this to a valid render material.

Permalink Reply by Gui Talarico on November 13, 2013 at 10:09pm

Hi Hannes,

Has there been any developments on this issue?

I am trying to render a color mesh in maxwell...

Thanks!

Permalink Reply by Hannes Löschke on November 14, 2013 at 2:27am

I had some downtime from coding and am migrating everything to Win8, .Net4 and VisualStudio 2013. So it might take soem time until I'm fully operational on that project again.

meanwhile there is some interesting code around by Vincente Soler (see here)

Permalink Reply by Gui Talarico on November 14, 2013 at 7:40am

Thanks for the link!

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