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So I have this racing game I'm trying to modify that uses lightmaps that fade to transparency for light sources. An example from the game:

enter image description here

I've been trying to produce a similar effect but with no luck. I've tried blender but that doesn't support transparency off of light sources, if anyone has any program ideas I'd greatly appreciate it!

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Not sure what sort of lightmaps are produced by blender. Perhaps if you can get it to render a non-transparent lightmap (for example one that has all the colours you want but on a black background), you could then use a program to remove all of the black. I believe GIMP and Photoshop both have a colour to alpha tool. Be sure to pick a background colour that will not be the same colour as any of the lights.

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