Calc::GetPolygonArea

Returns the signed area of a polygon.

float GetPolygonArea(int32 vertexCount, const Point3D *vertex, const Vector3D& normal);

vertexCount	The number of vertices defining the boundary of the polygon. This must be at least 3.
vertex	An array containing the vertices of the polygon.
normal	The normal direction of the polygon.

The GetPolygonArea function returns the signed area of a polygon whose vertices are given by the vertexCount and vertex parameters. If the vertices are wound counterclockwise about the normal direction, then the returned area is positive. If the vertices are wound clockwise, then the returned area is negative. The polygon does not need to be convex.

Calc::ConvexPolygon

Calc::PointInConvexPolygon