# Vector*Matrix

Preferred way to use vector * matrix

The vector * matrix multiplication operation has quite a reasonable cost, despite the number of calculations that need to happen.

However, optimisations such as taking advantage of knowing that `w`

is 1, do
not reduce the cost.

fragColor = t * m1;// 4x4 matrix, eight cycles{mov} {wdf} {sop, sop, sopmov} {sop, sop, sopmov} {sop, sop} {sop, sop, sopmov} {sop, sop, sopmov} {sop, sop} fragColor.xyz = t.xyz * m2;// 3x3 matrix, four cycles{sop, sop, sopmov} {sop, sop} {sop, sop, sopmov} {sop, sop}