Incandescence and transparency help please

[joebun]

how can I combine incandescence and transparency? For example, I want to create a cylinder, with say a checkerboard pattern, where the middle of it glows but the edges fade until they're totally transparent.

thanks...

[gasman00]

just map two different ramp nodes to the trans and incand. the transparency ramp should be white - black - white. and the incandecense should be the oposite. Both linear V-ramps.
Let me know if you have any quesitons.

[joebun]

Yeah, I tried that, and it works as long as I use a ramp for the incandescence. But what if I'm trying to use a texture for incandescence? Whenever I try and use a texture for incandescence and a ramp for transparency, the parts that are supposed to be invisible still light up...

[gasman00]

That's because the texture file you mapped to the incand has a value (is not 0 / black) where you want it to be transparent.
It's still invisible but giving off light.
Just paint the parts of the texture you want completely hidden true black and you're good.

Remember that the trans and incand don't work on each other, they are independent, they only work on the material / surface.