Light leak issue - GI related??

[Warifus]

Hello,

Has anyone seen this issue before?


There is an IES light with a profile inside the housing. It seems that the rim becomes illuminated no matter where I place the light.

BF/LC
leak prevention 0.8

Any help would be greatly appreciated.

[Alex_M]

Does this go away if you add a shell modifier to your ceiling? Make sure it's not just an infinitely thin plane, add some thickness to it. Usually this fixes all light leak problems.

[Svetlozar Draganov]

Would it be possible to attach that scene along its assets for investigation?
Does the leak goes away if GI is disabled?

[Warifus]

My issue seems to be resolved. I closed the box which makes up the ceiling thus avoiding the paper thin geometry.

@Alex_M, your shell modifier suggestion would also have worked. Thanks

I have another project that had this issue as well. I'll try to use this fix.

[cmjohncheng]

i hv this problem too, but previous vray(maybe 2.x) look like dont hv this problem.

[vlado]

i hv this problem too, but previous vray(maybe 2.x) look like dont hv this problem.

Sometimes Embree causes such issues. You could try turning Embree off, but in that case rendering will also be (a lot) slower.

Best regards,
Vlado

[Warifus]

I also struggle to get the light to render as an object.

I sometimes model the bulb and shade it with a vraylightmtl. I then drop the IES light just below the bulb. This gives me a bright point that I can add bloom and flare to in the VFB.

I never felt this was the correct method. Would be nice to hear some other tips and tricks.

[vlado]

It's an ok method, just make sure to turn off "generate GI" for the part that has a vraylightmtl material.

Best regards,
Vlado

[cmjohncheng]

I also struggle to get the light to render as an object.

I sometimes model the bulb and shade it with a vraylightmtl. I then drop the IES light just below the bulb. This gives me a bright point that I can add bloom and flare to in the VFB.

I never felt this was the correct method. Would be nice to hear some other tips and tricks.

i using similar method, but use small sphere vray light. looking for better way too.

[Warifus]

It's an ok method, just make sure to turn off "generate GI" for the part that has a vraylightmtl material.

Best regards,
Vlado

Great tip. I never thought to do that.

What would be a physically accurate value for the vraylightmtl? I ask because I want it to react accurately to the bloom and glare in the VFB the same way a camera would.

I use a web profile on the IES and a value of 800-1500 lumens. My thinking is that the values will be physically accurate in relation to the vraysun and sky coming through the window.


Thanks!