Polygon spawn problem

[Kilinich]

Recently, I faced with a problem that I can't spawn many-nodes polygon in correct position. It's because pos := [x,y] means position of mass center, not origin of vecs/surfaces points. So I need to calculate coordinates of mass center (in surfaces coordinates) and shift pos according it.

For triangle it's simple: [(x1+x2+x3) /3,( y1+y2+y3)/3] but for other polygons you need to use pretty complex formulas (but you always can split it in triangles, right ).

http://en.wikipedia.org/wiki/Center_of_mass

[Someone Else]

Do you always need to know where the center of mass is? I can think of one situation where you want to spawn the polygon at the center of mass, irrelevant of the surfaces. (when you know where you want the center of mass to be, but don't know what the surfaces are and the polygon is symmetrical)

Or maybe you could create a universal scene.my.math function for this problem.

AND WHAT HAVE YOU DONE TO YOUR AVATAR?!?!?
Where's the bunny?