Thanks for the answers!
I know "Shape" can draw only convex polyedra, as it does a triangle fan with a point at the center (which would glitch with some concave polygons)
Sorry about the GL_LINES thingy, I meant why not use GL_POLYGON, as I think it can color-fill concave shapes.
Maybe in a fuuuuuuuuuuuture version, polygons could have Delaunai triangulation (for texturized convex/concave polyedra)
The input of such function is coordinates relative to a specific window. The result depends on the size of this window, it won't be the same on two different windows.
You're right, I haven't thought about that :oops:
Well, good luck and keep it up!
-Martín