- matrix3d( <affine function> [, variable] ).
- Description: returns the matrix of the <affine function>.By default, the <variable> is the letter $M$ (represents a 3Dpoint). That matrix is in the form :[f(0), Lf(vecI), Lf(vecJ), L(vecK)], where f is the affine map and Lf its linear part, (vecI, vecJ, vecK) is its canonical base.
- Exemple(s): matrix3d( sym3d(M, [Origin,vecK] ) ) returns [0,0,1,0,i,0,0,-1], representing the orthogonal symmetry with respect to the xOy plane.