VRayAlpha

[piotrus3333]

will VRayAlpha support on GPU make it into official 6 release?

[matanov]

Can you elaborate a little? You don't need to add a separate element to have an alpha channel if you are rendering with the VFB.

[piotrus3333]

it is about alpha behind refractions on GPU.

[matanov]

Have you tested this scenario with the beta?

[piotrus3333]

nope. I would like to know before I jump on board. release notes mention “gpu alpha rendering the same as cpu alpha” but it is pretty vague. what I am waiting for is basically this turning green, full support:

[matanov]

The list you are referring to has nothing to do with the refraction issue that's been fixed in V-Ray 6.

The separate VRayAlpha element is needed only when rendering without VFB. If you are using VFB, there's always an alpha channel included.

[fixeighted]

It appears to be working ok now, which is great!

Oddly, the white values where the refraction would earlier be messed up are not 1.0 as you'd expect....in a simple test it went from 0.994 to 1.009.
Totally negligible obviously...just thought to mention it

[fixeighted]

Actually, sorry to report that I broke it again...a bit. See attached. There was something funny going on with the windows in that Cosmos model, so I rebuilt the side window, which is a box with Turbosmooth,
and the problem reoccurrs.

[piotrus3333]

The list you are referring to has nothing to do with the refraction issue that's been fixed in V-Ray 6.

The separate VRayAlpha element is needed only when rendering without VFB. If you are using VFB, there's always an alpha channel included.

heh, sorry, ignorance on my part. I appreciate the explanation and thank you for update.
great news.

[piotrus3333]

fixeighted I think that looks correct.

[^Lele^]

Oddly, the white values where the refraction would earlier be messed up are not 1.0 as you'd expect....in a simple test it went from 0.994 to 1.009.
Totally negligible obviously...just thought to mention it

Negligible as it may be, i can't wrap my head around refraction being higher than 1.0.

[fixeighted]

Hmm...don't think it is...look what happens if I move the window inside the car...and for comparison I added a box with a bend modifier which reacts as expected.

[fixeighted]

Hehe, yes Lele it is a bit odd. Here is the image so you can see for yourself https://www.dropbox.com/s/cr2w1nzgo6...PHA.vrimg?dl=0

[fixeighted]

I forgot this comparison image, with a box with a bend on it.
That is fine, but as soon as the edges are smoothed or chamfered for instance, then it breaks.

[fixeighted]

So I tried a simple setup as seen. To me this is wrong but what is strange is that it's the same whether CPU or GPU.

My brain is saying that if the glass is occluded by the ground, then it should not see through to the bkg...