is there a way to force the unwrapping to always be paralell to each polygon. By that i mean preventing that is turns the UVmapping into diagonals. I"m using a texture that has a lot of rectangular detail and i'd like those to always be aligned with the direction of the polygons / groups of polygons.

Thanks a bunch.

Cheers,

A.

If your mesh is rectangular, you could always use the longest edge of the primitive to align U axis, and a roughly perpendicular edge for V.