[HELP] - PTex rendering gray in VRay

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Old 07 July 2013   #1
[HELP] - PTex rendering gray in VRay

Im not sure if this is an issue on the Mudbox side or Maya/vray side. Here's the workflow:

Exported mesh from maya 2013 as obj with no UVs
Converted and painted PTex paint layer in Mudbox 2014
exported as 8 bit ptex
applied vray_Ptex shader
Default vray render settings

the ptex renders fine but with no color. Manually changing the RGB channel values in the ptex shader has an effect but i have no idea which values are correct.

Am I missing a step somewhere?
 
Old 07 July 2013   #2
you say ptex is rendering fine..?
whats the problem now..?
is only the displacement map working..?
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Old 07 July 2013   #3
Theres no displacment map at the moment. Its just a simple teapot with some scribbles on it to get a feel for how it all works. The problem is there is no color, its as if its only rendering the luminance.
 
Old 07 July 2013   #4
Below is a side by side of the vray render on the left and the mudbox viewport on the right:



As you can see only the luminance information is shown, no rgb.
 
Old 07 July 2013   #5
try to set the alpha channel to 3 in the vray ptex node...
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Old 07 July 2013   #6
changing alpha channel doesnt seem to have an effect either
 
Old 07 July 2013   #7
you should ask on the chaosgroup forum...
i have no idea whats wrong...
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Old 09 September 2013   #8
Solved

I hate to dig up an old thread but I wanted to post the answer to my original problem.

This video solved it for me
HTML Code:
http://www.youtube.com/watch?v=xKBJDxM5jus


All you have to do is manually set the color channels on the ptex node to:

Red = 0
Green = 1
Blue = 2

The colors on the ptex file should then render as they should.
 
Old 09 September 2013   #9
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