3D Projective
m3_projective(a, b)
a
numeric, 3: translation
b
numeric, 12: all other coefficients
matrix 4x4
m3_projective(c(2, 3, 1), c(0.5, 0.2, 4, 2, 6, 3, 2, 5, 1, 6, 8, 9))