/// <summary>
/// Calculates the surface normal normal of the polygon using the cross product
/// </summary>
/// <param name="poly"></param>
/// <param name="index"></param>
/// <returns></returns>
public static Vector3 CalcSurfaceNormal(this IPoly poly, int index)
{
return(-Vector3.Cross(poly.GetNormal(), poly.GetPoint((index + 1) % poly.Resolution) - poly.GetPoint(index)));
}
public static bool PointInPoly(this IPoly poly, Vector3 point)
{
return(poly.PointInPoly(point, poly.GetNormal()));
}