I try to set my screen in new windows by CORNER PIN option. So i made it like this, but we can see still a shape of original screen:
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When we use MASK now something strange is going one, becuse mask doesn't fit to the screen but to the "control points of original screen before using a CORNER PIN tool":
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I can only make PRE-COMPOSE with NULL OBJECT and mask it again, then works
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A question is: why we can't use a MASK on obcject modified by CORNER PIN?