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Question - Code Mask Backgrounds - showing through a mask the background behind

P

PedroKlein

Guest
Hello, I've being trying to create a way to make a certain area of my level to show the background bellow.
At the moment I have two layer of background, one with color (behind) and one without (front). my objective is to create a mask on the front background so i could see the behind background through a circle, square, etc.

I've tried using shader, drawing_layers, creating new surfaces and using bm_subtract. However i had problems with all of this options. I've done some similar in gm 1.4 to create line. But this time sems different I i really need help with it.

Thanks.
 
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