Is there a way to add triangle collision mask?

How do I...?
1

I need triangular mask for my game (for slopes). If there isn’t way to do that, then I guess it’s a feature request.

2

Why you can’t locate one quadrilateral’s vertex between two others vertices, as you samples here?:

3

Because I then either get weird shape or “polygon must be convex” error.

4

Just remove a vertice and it should be ok.