VrayLight Alpha bug?

[ben_hamburg]

Hi there,

I have a weird Issue: I just started reworking an older scene and I noticed that my VrayLights were rendering black with Alpha -1.
I never had that issue before, any Idea what might be causing it?
We´re on 3.004.

[svetlozar.draganov]

Where is that Alpha -1? In the WrapperMtl/Matte Properties?
Would it be possible to attach sample scene?

[ben_hamburg]

Lights don´t have matte properties, so I really don´t know why I can see it in the rendered alpha channel...

I can´t attach the scene right now, I ´ll try to find the time to do that. I just wanted to know if anybody experienced something like this before. Only light I know that can affect alpha is domelight...

[svetlozar.draganov]

Is Invisible checkbox activated? What about Embree?
May you update to the latest official 3.00.07 and see if there is any improvement on that regard?

[ben_hamburg]

I just merged the scene into a clean scene and voila - Problem solved.
It´s a bit like tech supports standard answer and running gag: "Have you tried turning it on and off again?"

Then I saved the render preset from the original and loaded it into the fresh one and the problem was back...
So I checked the render settings and found the problem:
In the original scene (the one this one was based upon) I had tons of refractive elements and was playing around with render settings to optimize render speed (something I´m still struggling with...), for one I set maximum transparency levels from 50 to 3...
Once I set this back to its default value the vraylight no longer was rendering black with alpha -1...

[svetlozar.draganov]

Glad to hear you sorted it out.
This however looks like a bug which I cannot reproduce here - probably the setup I am using is different.
Would it be possible to prepare a simplified version of the scene which still holds the issue and send it for investigation?

[ben_hamburg]

I just noticed the same problem in a different scene, I´ll try to send a simplified scene to support!

[ben_hamburg]

Sent it to support! Happy bug hunting....