Vray gpu 5.1 adaptive lights in optimizations

[luisgamino2]

Hi Muhhamed

I'm doing some tests about adaptive lights in optimizations

I did a test with out adaptive lights and it looks really Bad if You switch it off.

It needs to be on to render a better artificial lights... The question is i have a proyect with 32 lights omnilights. In the adaptive lights You can change the number, 8 is the default, what happend if i increase this number to 32 or 16 or in the other way i select 4 lights???

Right now i'm doing some test with adaptive lights on, but with 32... It seems a little bit cleaner if i increase the number of lights.

In vray says..." When enabled, vray choose at random the specified number of lights and evaluates only those for rendering, this speeding up render time.

" This option can introduce a visible degree of additional noise, but it makes it possible to render images that would otherwise take very long time"

What does it mean???!!! This is a question for so long!!!

I don't want to use vray gpu or vray as a prescrption i want to learn how does it work each parámeter.

Thanks in advance

[Muhammed_Hamed]

Hi Luis,

In the adaptive lights You can change the number, 8 is the default, what happend if i increase this number to 32 or 16 or in the other way i select 4 lights???

Lets say you have 50 lights in your scene, this parameter should be always smaller than 50 in this case.. you could use 8 to 32 in this case
If you leave it at 8, you should be fine as well, this number is kind of the sweet spot for most architectural scenes(unless you are dealing with hundreds of lights)

Right now i'm doing some test with adaptive lights on, but with 32... It seems a little bit cleaner if i increase the number of lights

How many lights do you have in your scene?
the higher number you use, the more lights will be taken into consideration for evaluation. The image will be cleaner yes, but it might be a bit slow to render
The main purpose for adaptive lights is speed, V-Ray is smart enough to know which lights are more important for the final image, and allocates samples accordingly. This is called scene adaptivity, it speeds up scenes that use a lot of lights. Please take a look at this testing here,

https://www.chaos.com/blog/understan...daptive-lights

The more lights you have, the more speed up you get from Adaptive lights

You can test with different number of lights, but don't turn off Adaptive lights completely

Best,
Muhammed

[luisgamino2]

Hi Muhhamed

Yes i did some test and i found that between 6 or 10 lights are the Best settings. If i increase it omni lights seems a little bit darker and dome light looks more like a raw light it doesnt have any kind of adaptative but if i decrease the lights like 6 i get more intensity on omnilights and dome light looks more like blurry versión kind of adaptative.

And if seems that if You increase the lights vray take more time to render.

I'm using right now 6, always My proyects are on 20 or 40 lights not that much.

Thanks for the explanation Muhammed, i think is important some times to do some tests to understand how vray works.

8 by default is great but 6 or 10 looks Nice too.

Best regards