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how to make an object glow

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hello, i was wondering how do you apply a colored glow effect to any object? what additional primitves are needed? where are they positioned? what textures do you apply to them? what blendmodes are used? thanks a lot!

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1) render what you want to glow into a texture (either the whole object or just a colour on black 'glow texture')
2) blur the texture, either use a shader, or you could down sample for a simple blur, or both
3) render the scene
4) render a fullscreen quad with the blur texture applied and additive blending enabled

use glBlendFunc(GL_ONE, GL_ONE) for additive blending.
Set quad alpha to 0 maybe?

[Edited by - JPulham on October 26, 2008 12:38:54 PM]

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