DiffuseFilter with Vray Dirt in material is affected by Vray Light

[dsolod]

Hi,
I hope the picture is self explanatory.
If it's a bug would it be possible to fix it?
What would be workaround for now if I can not exclude the VrayLight in the VRayDirt Exclude list?
Thank you!

[benb32]

Without seeing the light setup, can't say for sure. Best guess is the light plane is casting gi shadows - which is physically correct, the direct illumination is excluded. Create a vraycolor and give it a colour, but set the alpha to 0, which will allow the gi samples to pass through. Then assign the vraycolor to your light.

[Dave_Wortley]

You'll be able to exclude the VRayLight using maxscript, it's a limitation of 3dsmax that Lights can't be in an include/exclude list dialog as they were originally implemented only for lights... and thus therefore exclude themselves.

But making my own test it does look like it's the Shadow Casting as Benb32 says.

[Dave_Wortley]

Can't find a work-around....

[Dave_Wortley]

Ah no got it, you need to use the Result Affect not the Exclude list, you can simply include all the geo in and it will ignore the lights... or you can use maxscript to exclude the lights.

$.material.texmap_diffuse.resultAffectExcludeList = #($VRayLight001)

for example.

[dsolod]

Thank you Dave!
I will try.
Hi Benb32, it's VrayLight with default settings in Invisible mode and we are talking about DiffuseFilter which is not affected by GI.
I'd like to consider that behavior as a bug and asking Chaos team to make a note on it.
Thanks!
Dmitry

PS. 3ds max 2016 with Vray 3.40.01