Scale matrix.
Source
factory Matrix4.diagonal3(Vector3 scale) {
final m = new Matrix4.zero();
final mStorage = m._m4storage;
final scaleStorage = scale._v3storage;
mStorage[15] = 1.0;
mStorage[10] = scaleStorage[2];
mStorage[5] = scaleStorage[1];
mStorage[0] = scaleStorage[0];
return m;
}