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Byron

OpenGL fullscreen scanline effect

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I want to create a full screen scanline effect. My scene is mainly made up of wireframe renders and I want to introduce a 'fuzzy' scanline effect over the top of the whole scene to give it a kind of holographic feel (think the holograms in Star Wars). I thought about just a quad with a scanline texture and saturated alpha but it didn't really look good. This has to work on OpenGLES so I can't use shaders. Any ideas?

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Just a shot in the dark, why not draw the overlay texture with finer lines and complete opacity, then jitter it a bit with a much lower opacity? I'd say throw in a bloom, but you said no shaders =).

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That's essentially what I was doing but I need it to be a bit more dynamic to give that hologram feel. So what I am doing now is fill the screen with lines and vary the opacity of the lines each frame to give it a shimmer.

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