Multiplies two mat4s treating them as 3x3 rotation matrices. Only computes the upper-left 3x3 portion, sets the 4th column to [0,0,0,1]. More efficient than full mat4.multiply when working with pure rotations.
the receiving matrix
the first operand
the second operand
out
Multiplies two mat4s treating them as 3x3 rotation matrices. Only computes the upper-left 3x3 portion, sets the 4th column to [0,0,0,1]. More efficient than full mat4.multiply when working with pure rotations.