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roos

OpenGL Best way to add fog to 2D game

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Hi, I've used fog in OpenGL before for 3D stuff, but never thought about using it for 2D though. Would this work? I don't see why not but I just wanted to check if anyone thinks I'm running blind into a wall, or if there might be a more efficient way :) I think vertex based fog is pretty efficient though afaik, much more so than, say, alpha blending a quad over the entire screen. Of course the fog will be uniform over the screen since there's no depth information but that's fine, I'm just going for an overall thick fog effect. Thanks roos

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Yes, I think it would work fine. For more interesting effects, you could check out glFogCoord (available as an extension and in 1.4, if I recall correctly).
The less efficient way you mention (blending a quad over the screen) might be worth it if the quad has a nice texture. Like Perlin noise, for example.

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