spot light doesn't work in progressive mode vray3.6

[Inbal]

HI,
Im working on version 3.6 with the spot light.
in the manual its says:
"The Cone Angle & Penumbra Angle parameters are not supported when rendered in GPU mode."

I tried every option- none of them work when Im on the Progressive mode. does it mean I cant do a good quality render with the spot light?

I did a basic scene with only 1 spot in the room-
I tried all the options and the only one which works is the interactive one...

How can I work with the progressive with vray3.6 when I have spot light in my model?

[Inbal]

Anyone? I can sure use some help.

[konstantin_chaos]

Hi Inbal,

I tested a similar scenario and the Spot Light was rendered as expected.
It works in both CPU and GPU modes.
The Interactive toggle did not change anything for me. All results were identical.

If you share your test scene I'll experiment some more and possibly find the reason for this inconsistency.

Regards,
Konstantin

[Peter.Chaushev]

Actually, in v3.6 Spotlight's penumbra/cone angles and Rectangle light's directionality are both supported in GPU.
When you mentioned it doesn't work in Progressive, do you actually get a different result in Bucket mode (Progressive and Interactive turned off, available on CPU only)?
Could you please send a sample scene to support@chaosgroup.com?

Kind regards,
Peter

[Inbal]

then what does that mean? it's from the vray manual.
here is my test room
test room.zip

[Peter.Chaushev]

Thank you for pointing this out and for providing the scene. We have edited our documentation.
The render output you managed to produce is actually correct. It is the resulting combination of daylight, Global Illumination, a colored spotlight, and a room with completely white walls. The time it takes to calculate the Light cache is expected.
Add a material to the walls and you should get a more realistic result. Simply choosing a slightly "dirtier" white, or any of the wall selection in the preset library https://docs.chaosgroup.com/display/...rials+Category would do.

Kind regards,
Peter

[Inbal]

Please look at the first image I sent you-
how come when Im in Cpu and Interactive the walls are much darker?
and the link you attached is broken, I would love to know where the preset library is.

[Peter.Chaushev]

I edited the link in my previous post. The Preset Library is accessed through the Asset Editor's Material List by expanding the left-side panel (https://docs.chaosgroup.com/display/...terial+Library).

In Interactive mode only Brute Force is used for GI. In Production, secondary rays are set to Light Cache which contributes to a lot more light bounces (if comparing default values), and thus a brighter image is achieved. For further info, see https://docs.chaosgroup.com/display/...ation+Settings .

Kind regards,
Peter

[Inbal]

can you please explain?
does it mean if I use the interactive the scene will always be darker if I use the spot light?
if so, how can I check my scene?

[Peter.Chaushev]

can you please explain?
does it mean if I use the interactive the scene will always be darker if I use the spot light?
if so, how can I check my scene?

Your scene is an exception due to the setup of lights + perfectly white walls. This is why when using Light Cache for the Global Illumination calculation you get a brighter image than in Interactive (which uses Brute Force only). Also, keep in mind perfectly white (and perfectly black) materials don't really exist in nature.
If you apply any material (e.g. https://docs.chaosgroup.com/display/...rials+Category) to your walls you'll notice the difference between Production and Interactive render modes will be gone.

For more info how Indirect Illumination works in V-Ray, visit
https://docs.chaosgroup.com/display/...Brute+Force+GI
https://docs.chaosgroup.com/display/...Light+Cache+GI

Kind regards,
Peter