Chessboard based on the geometry of the sphere [Echiquier basé sur la géométrie de la sphère].
Chessboard based on the geometry of the sphere [Echiquier basé sur la géométrie de la sphère].
= PA[FX[x,y],FY[x,y]]
FX[x,y] = A11.PX[x,y] + A12.PY[x,y] + A13.PZ[x,y]
FY[x,y] = A21.PX[x,y] + A22.PY[x,y] + A23.PZ[x,y]
(X and Y periodical)
(the 'X' pseudo-projection of the sphere)
(the 'Y' pseudo-projection of the sphere)
(the 'Z' pseudo-projection of the sphere)