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why my shader not work properly?


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it automatically calculates object bounds if you dont specify filterArea. It takes power-of-two size temporary render texture to draw container in, and then applies shader to a part that is corresponding to filter area..
However, if filterArea is whole screen, screen-size buffer is used and you can omit those coordinate-related tricks, like in pixi-v3 and most of 2d webgl renderers.

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