How can I make a material emit light

[Synthesizer]

Well, one way of doing it is to use final gathering and make a plane with a surface shader on it with the value set to larger then 1. You could do the same with other materials too, but if its just for a lighting card, the suface shader would be the simplist.

[e'lan]

Download ctrl_geoshader. There's a thread in this forum itself on the details of the shader.

[vintagetone]

I didn't see a "serface shader", so I assigned a material, set the Diffuse value to 2, and it is not imitting light. Is there a way to make an object a light, something that illumins the scene?

[vintagetone]

can't find ctrl_geoshader either, but saw a thread where it was mentioned.

[McWolfe]

Couldn't you use the materials Incandesence-channel for that? I have used it when doing FG-renderings, and it works just fine.

McWolfe

[Chris-TC]

Incandescence doesn't make a material emit light. It brightens it as if it was glowing but it doesn't emit light.

Using the Geoshader is probably your best bet if you don't want to rely completely on FG. For a square shape you could also use a square area light.

[McWolfe]

Incandescence doesn't make a material emit light. It brightens it as if it was glowing but it doesn't emit light.

Using the Geoshader is probably your best bet if you don't want to rely completely on FG. For a square shape you could also use a square area light.

I think we both are right. It doesn't emit light or photons, but it does give light in conjunction with Final Gather.

http://67.15.36.49/team/tutorials/profaneray/profaneray3.asp

" The incandescence color will provide a big amount of light spread all over the scene.so remember when yoy wanna lit something with Fg you need to assign a shader with a bright color in the incandescence field."

McWolfe

[brendan_orr]

I've a question: what is wrong with using a simple area light? I'd think it would be less expensive than FG... my $0.02...

[vintagetone]

You are right, it would be less expensive as well as easier to manage, but I have not found that I have control of the highlight produced by such a light. It lights a large area, but I do not seem to be able to produce a reflection of the light. Also, I need a soft, not a hard edge on the reflection.

[beau]

You can download ctrl_geoshader from yashu's site, yashu.go.ro

[vintagetone]

Nice looking site. Hope some samples can be added soon.

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