3ds Max 20222 / V-Ray 5 Update 3
Dear community and V-Ray developers,
I guess I'm facing a roughness issue when using the VrayMtl with metallic and pure black specular color. This is not about a physically or non-physically behavior, this is about a strange behavior when changing a color value of specular.
edit:
This issue is only visible in the CPU renderer, for GPU it seems to be as expected.
![spec.png Click image for larger version Name: spec.png Views: 12 Size: 299.0 KB ID: 1141114](filedata/fetch?id=1141114&d=1645732689)
Behavior when decreasing the roughness - nothing is changing in the material probe sphere. (same if I use roughness in the BRDF section).
![spec_gloss.png Click image for larger version Name: spec_gloss.png Views: 11 Size: 97.7 KB ID: 1141115](filedata/fetch?id=1141115&d=1645732973)
Now i increase the specular color a little bit:
![spec_gloss_decrease.png Click image for larger version Name: spec_gloss_decrease.png Views: 11 Size: 338.7 KB ID: 1141116](filedata/fetch?id=1141116&d=1645733146)
With a specular color more than pure black the behavior of glossiness or roughness behaves as expected in my point of view.
Is this an issue or is this a regular behavior of VrayMtl? In general I would not use the specular color when using metallic property in a physically manner, but from an artistic point it can be useful to have a kind of specular layer on top of the metallic surface. What do you think?
Thanks Guido
Dear community and V-Ray developers,
I guess I'm facing a roughness issue when using the VrayMtl with metallic and pure black specular color. This is not about a physically or non-physically behavior, this is about a strange behavior when changing a color value of specular.
edit:
This issue is only visible in the CPU renderer, for GPU it seems to be as expected.
Behavior when decreasing the roughness - nothing is changing in the material probe sphere. (same if I use roughness in the BRDF section).
Now i increase the specular color a little bit:
With a specular color more than pure black the behavior of glossiness or roughness behaves as expected in my point of view.
Is this an issue or is this a regular behavior of VrayMtl? In general I would not use the specular color when using metallic property in a physically manner, but from an artistic point it can be useful to have a kind of specular layer on top of the metallic surface. What do you think?
Thanks Guido
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