VRayLightMtl not casting with IRMap

[CXStudios]

Okay guys, this might be an easy answer, I did a search but didn't come across my problem. I have an object with a pure white VRayLightMtl applied to it; if I render using QMC there's plenty of glow on a nearby surface, enough to want to turn down the amount. If I switch to IRMap no Light is being cast by the material. What would cause this?

... Actually looking at the image a bit more, it almost seems that the QMC glow is actually just noise from the sampler... hmmm Does this sound familiar to anyone?

[Candelero]

Can you show some renders, they will tell more. Thank you !
and the VRayLightMtl setup as well.


Best regards,
nikki Candelero

[CXStudios]

I figured out the problem, the scene is so large that no samples are being placed beind the sign with the VRayLight Material. If I turn up the samples the image gets worse due to more correct samples being placed, but the 'glow' starts coming into effect.