VRayMtlWrapper: How to make character shadow pick up tint from the baseMtl?

[TheRazorsEdge]

Hi all,

I have a scene with the following setup: animated character, VraySun&Sky, GI enabled (BF/LC), a ground object with VRayMtlWrapper set to Generate GI/Receive GI:On, Generate caustics/Receive caustics:Off, Matte surface:enabled, Alpha contribution:-1, Shadows/Affect Alpha:On, with a red-dirt-ish VrayMtl appllied in the Base material slot.

Now, I'm trying to catch the character with a proper shadow/alpha, which works fine more or less except the shadow and alpha-"halo" pick up the tint(gray/blue-ish) from the VraySky texture, which is not really what I want.

How do I make the VRayMtlWrapper shadow pick up the tint (red-ish) from baseMtl instead,where the character is "over" the ground, ideally without altering the environment?

Cheers!

[tashko.zashev]

Hi,

Would it be possible to attach a simple scene representing the issue you have?
Also which V-Ray version you are using?

[ricoholmes]

Hello, did we get a resolution to this problem ?
Have been having the same problem here quite a lot, always when using VRayMtlWrapper (not using sun or sky, so that's not where the tint is coming from).
We're getting halo's, or more accurately described: dropout in the darker areas of shadow.


illustration of problem

[Svetlozar Draganov]

Would it be possible to send us maya scene along with the final composition?
Let us also know the exact version of V-Ray and Maya that you are using.

Thank you very much in advance.

[ricoholmes]

Svetlozar Draganov - you can ignore the email I just sent.

I located the problem -- it was because the light (VRayRect) shadow color was set to black. if it's set to (value) 0.001 almost black it works fine

[ricoholmes]

That was stable release 3.00.01
Just got nightlies access last night so will install now and confirm closure of the problem

edit - lastest nightly 141113 still has the problem, but at least we know the cause for now.

[Svetlozar Draganov]

It is still a good idea to send us the scene for investigation since the issue could turn out to be a bug.

[Svetlozar Draganov]

There is something wrong with V-Ray Light in the scene, if I replace it with new light with the same settings it works as it should.

[ricoholmes]

Hmm yes I can confirm that - I replaced it with a new light with the same settings and that one worked fine.

Could it be because it created in an older version ov Vray ? (Beta) I've seen this problem turn up a number of times on other scenes. At least I know the fix now.

[Svetlozar Draganov]

Yes it could be because the light is created with beta version and for some reason it doesn't work well in the official one.

[ricoholmes]

Well, we agree to potential problems when we sign up for Beta programs, so things like that can only be expected.
Beta was exceptionally stable and useable all those months, so I can only be thankful really

Again, we're aware of the source of the problem now, and the fix. Thank you for the outstanding support as always here.