template<class T> void OEGeom3DPlanarCoord(T *dst, const T *center, const T *r1, const T *r2, T len)
Calculates cartesian coordinate point
dst that has a distance of
len from the
center, placed on the plane defined by the vectors \((center-r1)\)
and \((center-r2)\) and on the line bisecting these two vectors.