VRayFur does not like Primary Visibility OFF

[alainfx]

Hi,


This is in Maya2011 SP1, VRay for maya 2.00.04 stable build 15820 (june 21th 2011), Windows 7 64 bit.

VRayFur works really well, but we see a bug when we do this :

Create a sphere, attach VRayFur to it (reduce the thickness, increase the "Per Face" attribute to 100).
Select the VRayFurPreview1 , switch the Primary Visibility to OFF.

Render, you should only see the sphere.
But in fact you get a sphere with stange artifacts (see picture below).


Everything is default value, there isn't even a VRayMtl (but adding it don't fixes the problem).
I use DMC sampler.

Of course our problem is in a real production scene (with settings set to high quality), but it is also visible in this simple sphere scene.
I attach the scene here :
furVisibilityBug_05.zip

Cheers.

[vlado]

You need to increase the max. transparency levels in the V-Ray global switches rollout. V-Ray treats invisible geometry as fully transparent, and if there are too many transparent layers, it will give up tracing a ray.

Best regards,
Vlado

[alainfx]

You need to increase the max. transparency levels in the V-Ray global switches rollout.

It solves the artifacts problem, thanks Vlado !
But the render is a lot slower now...

V-Ray treats invisible geometry as fully transparent, and if there are too many transparent layers, it will give up tracing a ray.

Is it something that could change in the future (it could speed our VRayFur renders a lot) ?

Cheers.

[vlado]

Is it something that could change in the future (it could speed our VRayFur renders a lot)?

Yes, I realize the transparency approach is far from perfect and we are thinking of possible optimizations for this case.

Best regards,
Vlado

[alainfx]

Thanks Vlado.