When you specify a rotation for an object, you do something like this :

```
_earthNode.rotation = SCNVector4Make(1, 0, 0, M_PI/2);

```

What I am not getting is how to specify a specific rotation for each axis ? Because let's say that I wanted to rotate my node from PI on x, PI/2 on y, and PI/4 on z, how would I do that ? I thought that I could do something like this :

```
_earthNode.rotation = SCNVector4Make(1, 0.5, 0.25, M_PI);

```

But it doesn't change anything....  

**How does this property works ?**