Overlapping V-Ray Light Reflections are not additive?

[mattclinch]

Been a long while since I was here. Hello again.

 

Got a pain of a problem.

 

2 V-Ray light planes are kicking off a reflective surface with 'Affect Reflections' only. The reflections overlap. I would expect the 'planes' themselves to be additive, so that the reflection of the area where both lights overlap is brighter, but instead the nearer light occludes the further one.

 

Anyone got a fix? Seems like odd behaviour.

[Ismael]

Does not seem odd but if you do get a "fix" please post it.

[notamondayfan]

Is it happening because 1 vray light is casting a shadow from the other light? Try ticking "invisible" on the lights?

 

Dean

[Tommy L]

You are trying to use the vray light planes as highlights? The planes act like geometry, so yes, one would occlude the other. hinky fix micht be to put planes where your lights are and then paint an ilummination texture. Put that texture into a VrayLight material. You could then check the 'use map as opacity' and your lights should, in theory, 'boost' each other. Bit wierd though, the math gets odd. I think if you post a render I could provide a better solution. I do a fair amount of car work and this is one of those things I have to solve all the time when lighting cars for a 'studio' look

[mattclinch]

You are trying to use the vray light planes as highlights? The planes act like geometry, so yes, one would occlude the other. hinky fix micht be to put planes where your lights are and then paint an ilummination texture. Put that texture into a VrayLight material. You could then check the 'use map as opacity' and your lights should, in theory, 'boost' each other. Bit wierd though, the math gets odd. I think if you post a render I could provide a better solution. I do a fair amount of car work and this is one of those things I have to solve all the time when lighting cars for a 'studio' look

 

Yes, that's exactly what i'm trying to do. I think it may act this way by design. Looks like we'll have to try this route or comp it all in post.