Primary Visibility OFF and Max Transparency Levels

[Adbk]

With Primary Visibility turned OFF on a detailed object with overlapping faces ( ie, a wrinkled up tissue), you need to have max transparency levels turned up in the globals (VRay/Materials/Max Transparency Levels) high enough such that the number of folds needed to "see through" is accomodated, otherwise you'll have black artifacts in your alpha. Not what you want if you are doing shadow passes etc.

Solution of course is to turn up the max transparency levels, but it seems odd since primary visibility usually acts as an "all or nothing" flag.

is this able to be addressed so max transparency levels do not need to be turned up and prim vis will act as it should?

Adam

[vlado]

We can improve this for some cases (i.e. proxies and other types of dynamic geometry), but probably not for everything.

Best regards,
Vlado

[Adbk]

Thanks For the reply Vlado

[KyronVFX]

We had a lot of issues with this, when rendering fur as well.

[vlado]

For the next major V-Ray version, this should be better for Maya hair, Yeti and Shave and Haircut; not sure about VRayFur yet.

Best regards,
Vlado

[Rhodri]

I'm having the same issue with VRay fur using 3.05.01 and Maya 2014, upping the max transparency does work but adds hugely to render time so not the ideal solution - are there any plans to look at this again?

Cheers,

Rhodri.

[vlado]

Yes, it is still on the "to do" list and we'll get to it soon.

Best regards,
Vlado

[Rhodri]

Great to know, thanks Vlado.

[pizzaia]

I'm actually getting to a point that even trying with max transparency levels at 1000 (test purpose) the black holes in the alpha are still there, and they are worst in the deep.
There's any other way to fix this? The material is just a vrayMaterial with and opacity map attached, and the geometry has tons of overlapping faces, but is not something that we can change.
Thanks!
Gianluca Pizzaia

[vlado]

You could try increasing the "secondary rays bias" a little bit, f.e. to 0.001 or something like that.

Best regards,
Vlado