Internal utility that clips an rgl mesh3d by a plane defined as Ax + By + C*z + D = 0, returning the two resulting meshes.
meshClip(plyFile, A, B, C, D)A list with two elements:
meshAThe submesh on the side where A*x + B*y + C*z + D >= 0.
meshBThe complementary submesh (may be NULL if empty).
An rgl mesh3d object to be clipped.
Numeric coefficients of the clipping plane
(plane equation: A*x + B*y + C*z + D = 0).