Calculate normal (directional) from polygons?

Is it possible to turn a polygon shape into a surface in Matlab to find it's normal direction? The input matrix I have for each polygon is in the following format:

[column 1: x-coordinates; column 2: y-coordinates; column3: z-coordinates]

The coordinates are already sorted in sequential order, so it's normal will go in one direction or the other. The polygons are all 2-dimensional, but can be rotated in any direction (which is what is sought).

Matlab version R2007a is being used, if that makes any difference in the response to this problem.

Thanks!

Answer 1

[bym]

why not use the cross product from 2 edges?

doc cross