assume i’ve got a 2d polygon and texture coordinates at all its vertices… and now i want to get a texture coordinates at some vertex inside the polygon. is it possible, plz… 
Divide your poly… you can’t assign texture coordinates to a point inside a poly because that point isn’t a vertex.
mmm
ehm… i know. but i don’t want to assign a texture coordinate. i acutally want to split polygon but i need to compute some reasonable texture coordinates for new vertices… 