Why can't Contrast Node in Maya Hypershade connect to Roughness slot in Vray material

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Old 06 June 2013   #1
Why can't Contrast Node in Maya Hypershade connect to Roughness slot in Vray material

Hello there,

I got a roughness map for my shader, which I am generally happy with, but I want to increase the contrast of the texture, so I plug it into a Constrast Node as value. This Contrast Node I am trying to MMB drag to Roughness on the VRay Material... but to no avail. When I try to do it via the connection manager, roughness is greyed out.

Am I missing something painfully obvious, and are there better ways to increase contrast on a texture in Hypershade?
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Marque Pierre Søndergaard
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Old 06 June 2013   #2
While I've never used vray, I assume the roughness value still uses luminance only as it is a single channel value rather than rgb.

So maybe in the connection editor instead of connecting the contrast output to the roughness value, see if you can expand the contrast output and reveal its x,y and z values and just connect one of those to the roughness. Provided the input is grayscale those 3 channels should all be the same so it doesn't matter which one you pick.
 
Old 06 June 2013   #3
Good point Pap! Seems to work.
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Marque Pierre Søndergaard
Texture Artist!
- Blog - IMDb
 
Old 06 June 2013   #4
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