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By Lizard-13
#62288 Each collision mask has to be a convex polygon (any number of vertices), but you can have multiple collision masks, so you can simulate any complex shape (even concave ones) ;)
You can't do it:
Collision_Mask_0.png (41.19 KiB) Viewed 1814 times

But you can do it:
Collision_Mask_1.png (29.83 KiB) Viewed 1814 times

:!: Take into account that increasing the number of vertices and collision masks reduce the performace per collision test, specially in HTML5, but I have never tested it though...