mul method
Implementation
MatrixD mul(MatrixD o) => .mat4(
m0*o.m0 + m1*o.m4 + m2*o.m8 + m3*o.m12,
m0*o.m1 + m1*o.m5 + m2*o.m9 + m3*o.m13,
m0*o.m2 + m1*o.m6 + m2*o.m10 + m3*o.m14,
m0*o.m3 + m1*o.m7 + m2*o.m11 + m3*o.m15,
m4*o.m0 + m5*o.m4 + m6*o.m8 + m7*o.m12,
m4*o.m1 + m5*o.m5 + m6*o.m9 + m7*o.m13,
m4*o.m2 + m5*o.m6 + m6*o.m10 + m7*o.m14,
m4*o.m3 + m5*o.m7 + m6*o.m11 + m7*o.m15,
m8*o.m0 + m9*o.m4 + m10*o.m8 + m11*o.m12,
m8*o.m1 + m9*o.m5 + m10*o.m9 + m11*o.m13,
m8*o.m2 + m9*o.m6 + m10*o.m10 + m11*o.m14,
m8*o.m3 + m9*o.m7 + m10*o.m11 + m11*o.m15,
m12*o.m0 + m13*o.m4 + m14*o.m8 + m15*o.m12,
m12*o.m1 + m13*o.m5 + m14*o.m9 + m15*o.m13,
m12*o.m2 + m13*o.m6 + m14*o.m10 + m15*o.m14,
m12*o.m3 + m13*o.m7 + m14*o.m11 + m15*o.m15,
);
