v2.x = v1.x * bx.x + v1.y * by.x + v1.z * bz.x;
v2.y = v1.x * bx.y + v1.y * by.y + v1.z * bz.y;
v2.z = v1.x * bx.z + v1.y * by.z + v1.z * bz.z;
v2.x = v1.x * bx.x + v1.y * by.x + v1.z * bz.x;
v2.y = v1.x * bx.y + v1.y * by.y + v1.z * bz.y;
v2.z = v1.x * bx.z + v1.y * by.z + v1.z * bz.z;