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Shader Help - How would I get pixels under current sprite?

@Trinith wrote:

Not sure if that makes sense, but I want to highlight a sprite's pixels if it's over top of something else. I'd imagine I'd need to test a pixel against the back buffer maybe?

Anyway, I'm not sure how to do this... anybody have any ideas? Or at least, any keywords I can try googling? Image may be NSFW.
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:smiley:

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