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How to subtract buffer from backbuffer

Honored Contributor II

Hi, I'm working on this for ages... but it hasn't sorted out at all. 


Here it goes, 


now I'm trying making a difference image between buffer nd backbuffer but it doesn't work well because I think the buffer is written after backbuffer. so I don't know how to solve this problem. 


Does anyone have the same problem with me? 


Hope give me a little hint.
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