True lighting objects

[Fabrice]

Im a (Very) new VRay user :

What's the way to turn an object into a lighting object ?
I wan't to do a colored neon, red at one end and green at the other...
I tried :
- turning the material self-illum
- increasing RGB output of the self-illuminated diffuse
- increasing "generate GI" in VrayMtlWrapper's mat.

No way, the objet does not really generate light but only transmit it.

Thanx to all.

[twinxel]

Re: True lighting objects

Im a (Very) new VRay user :

What's the way to turn an object into a lighting object ?
I wan't to do a colored neon, red at one end and green at the other...
I tried :
- turning the material self-illum
- increasing RGB output of the self-illuminated diffuse
- increasing "generate GI" in VrayMtlWrapper's mat.

No way, the objet does not really generate light but only transmit it.

Thanx to all.

Well, it's the way, I think, but:
Try to REALLY increase output value to, say, 50, and you will start to see the difference...
And render the image with GI turned one, of course.
Regards,
Joao.

[J_Bug]

Don't forget to check the box beside the self-illum color swatch at the top.

--Jon

[sketch]

i think the size of the object also affects the light. i remember putting an output of 50 on a small light bulb in a room, and it lit the equivalent of maybe 3 feet in each direction. i had to add another GI bounce and increase the output value to like 100, but then i got a burning hot spot where the light bulb met the wall. in the end i had to fake it with an omni light and turning the light bulb's shadow casting off.
but then when i applied the original light material (with output = 50) to the ceiling of the room, everything was well lit.

[sunny]

Did you try putting an actual "output" map in the self-illum rollout? Not just adjusting the self-illum level.

SunnyC

[Da_elf]

just like egz i should point out that this is not the place for this post.

[Fabrice]

Thanx everyone for the advices.
You're right, it seems objects can behave like lights using one of those two ways :
- Increasing "output amount" of diff material
- Adding VRayMtlWrapper with increased "Generate GI"
Results are the same...

Fabrice

[Fabrice]

2 techniques for lighting objects...

Precising my last post ...

The 2 techniques don't act the same,
Here's a image of 2 teapot :
on the left auto-illum gradient ramp with output amount on 30,
on the right a VRayMtlWrapper with the "Generate GI" on 15.

The 2nd seems to act more real...

Fabrice

[R2J2]

interesting results, I woner witch one acts more like a neon light? I'd be guessing the right, the way the light overlaps each other.