VRay 2.0 - Still a Fog Problem with non-correct Geometry

[rs3d]

I hoped this was fixed but VRayMtl Fog still doesn't work correctly on interpenetrating geometry.

It still creates black parts where the geometry normal is flipped... because everything is
raytraced I hoped a correct "render normal" would be evaluated...

Thanks, Rob

fog-color-problem_vray2.zip

[Dariusz Makowski (Dadal)]

How many trace u use? Maybe u need more...

[rs3d]

I think it's not a problem of the number of traces, please try the example...

[rs3d]

Has anybody solved this with a different shader maybe?

[vlado]

It still creates black parts where the geometry normal is flipped... because everything is
raytraced I hoped a correct "render normal" would be evaluated...

It would rather be the other way round - because everything is raytraced, you must use correct normals. V-Ray heavily relies on normals being correct in many places, and there is no fast way to guess them.

Best regards,
Vlado

[rs3d]

Thanks, but is there a way to create correct distance fog / depth effect
for non-correct meshes?

Would be great to have a transparency based on the actual thickness of the
object along the ray? Or a scanline solution maybe?

Thanks in advance, Rob

[vlado]

Thanks, but is there a way to create correct distance fog / depth effect
for non-correct meshes?

Not sure; in any case it will likely be quite slow.

Would be great to have a transparency based on the actual thickness of the
object along the ray? Or a scanline solution maybe?

Nope, scanline rendering has nothing to do with it.

Best regards,
Vlado

[rs3d]

Mental Ray handles it easily with Parti Volume... and it isn't slow... just the wrong renderer

Please check the scene Vlado...

Thanks in advance, Rob

[vlado]

<shrug> mental ray is mental ray, V-Ray is V-Ray. There is no way to get this effect with V-Ray at the moment. VRayEnvironmentFog can be made to work in such cases, but not VRayMtl.

Best regards,
Vlado

[rs3d]

But VRayEnvironmentFog also relies on the normal of the object, so there would be black spots as well...

Thanks, Rob

[vlado]

Right now, yes; what I meant was that it can be reworked a bit.

Best regards,
Vlado