Tweet
I am revisiting an old project that was done 4-5 years ago with whatever version of Vray was current at the time. I'm getting a completely different result with a shader that was set up to sample a ramp using Random by ID.
I'm shading random bits of geo generated from MASH with an ID, sampling a simple four-color ramp to assign diffuse color randomly. The Random by ID attr. is plugged into the V Coord attr of the ramp (see attached grab). Previously this worked absolutely fine, with each piece of geo getting assigned one of the four shades of gray in the ramp permanently.
Now, the exact same scene file randomly reassigns one of the colors on each frame, causing unacceptable flickering through an animation. At first I thought it was perhaps a MASH issue, but baking my instancer to geo did not solve the problem so this seems to suggest it's the sampler info, especially as removing the connection and giving all the geo the same color removes the problem.
Has something about the way the Sampler Info works changed, or is there otherwise a different way I need to set this (very simple) shading network up in order to get color values to "stick". This is the second time in about a year I've gone back to an old project to find that a fundamental feature of a shading network has been broken by a new version of Vray, very disappointing.
I'm shading random bits of geo generated from MASH with an ID, sampling a simple four-color ramp to assign diffuse color randomly. The Random by ID attr. is plugged into the V Coord attr of the ramp (see attached grab). Previously this worked absolutely fine, with each piece of geo getting assigned one of the four shades of gray in the ramp permanently.
Now, the exact same scene file randomly reassigns one of the colors on each frame, causing unacceptable flickering through an animation. At first I thought it was perhaps a MASH issue, but baking my instancer to geo did not solve the problem so this seems to suggest it's the sampler info, especially as removing the connection and giving all the geo the same color removes the problem.
Has something about the way the Sampler Info works changed, or is there otherwise a different way I need to set this (very simple) shading network up in order to get color values to "stick". This is the second time in about a year I've gone back to an old project to find that a fundamental feature of a shading network has been broken by a new version of Vray, very disappointing.
Attached Files
Comment