public Mat4f mul(final Mat4f r) {
final Mat4f res = new Mat4f();
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 4; j++) {
res.set(
i,
j,
this.m[i][0] * r.get(0, j)
+ this.m[i][1] * r.get(1, j)
+ this.m[i][2] * r.get(2, j)
+ this.m[i][3] * r.get(3, j));
}
}
return res;
}
