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View Full Version : How to use emit/glow map images?

eMysfit
03-15-2009, 03:03 AM
I've spent all day looking for emit map tutorials and anything glow map-esque and just can't seem to find anything. So forgive me if there are any and I'd appreciate being directed to them. :banghead:

My question is basically..how do I make glow maps in blender? I've messed with the emit map settings as much as I could and couldn't get it to work right. When I mapped an image to it it would just affect the whole mesh.

I'm not looking for particle effects or anything like that. It's mainly for game art type things where certain things on the model will look like they are glowing.

Any help is greatly appreciated. If I need to explain further I can try also.
DanielWray
03-15-2009, 03:24 PM
You are using a black and white image with a UV map and it's set to Emit right?

Also blender doesnt havent any features that can produce the Glow, you'd need to be able too write a small GLSL shader that would use the texture map to create a light glow.
eMysfit
03-15-2009, 05:09 PM
Ya I've tried black and white, color, transparency images set to emit in everyway I could think of.

I know nothing about GLSL heh. Guess I'm probably out of luck. I wonder if there's a way to kind of fake it.

This is kinda what I'm talking about, if it helps. I'm not sure but you might have to be logged in the gameatrisans site to see the image, but you'll see his maps to the side, the bottom one being all black except the red eye glow. And that showing up over the model's eye.
Click here to see what I mean. (http://www.gameartisans.org/contests/minis/finals_gameartisans_3d_1800.html)

The image is Marco Puricelli's I had nothing to do with it, I'm just using it as an example because it shows what I mean.

Thanks for the response! I'm gonna just keep messing with all the different settings and maybe some other maps, I was messing with specular color maps and it had a kind of neat effect to it. Or maybe look into GLSL shader writing!
Ian Jones
03-15-2009, 05:56 PM
Do you need to show an in-game render? or can you fake some of the effects such as this in post-processing (compositing in photoshop) ?

The glow effect in game engines is achieved using different techniques, but all basically render as a final layer an additive blend of this type of map.

Oh btw, in regular renders setting a textures map-to blend mode to 'Add' achieves this effect.
eMysfit
03-15-2009, 06:55 PM
I think I'll try the add blend mode thing. Thanks alot!

I'm pretty new to all of this so I'm not too sure what I'm aloud and not. Mostly just toying with everything. I don't know why I didn't already think about that though it seems pretty obvious now. Thanks again.
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03-15-2009, 06:55 PM
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