In the projection of points onto the sphere, some triangles maybe flipped, i.e. in the wrong orientation. This function determines which triangles are flipped by computing the vector pointing to the centre of each triangle and comparing this direction to vector product of two sides of the triangle.
flipped.triangles.cart(P, Tt, R)
Points in Cartesian coordinates
Triangulation of points
Radius of sphere
List containing:
flipped
Indices of in rows of Tt
of flipped triangles.
cents
Vectors of centres.
areas
Areas of triangles.