# Why is a local rotate changing the global transform?

Attention Topic was automatically imported from the old Question2Answer platform.

I have setup a simple camera node and trying to rotate it by 90 degrees. As per the documentation:

`rotate` method “Rotates the local transformation around axis, a unit Vector3, by specified angle in radians.”

This is my code:

```func _ready():
print("Before rotate")
print(transform.basis)
print(global_transform.basis)
print("After rotate")
print(transform.basis)
print(global_transform.basis)
```

This is the output:

```Before rotate
((1, 0, 0), (0, 1, 0), (0, 0, 1))
((1, 0, 0), (0, 1, 0), (0, 0, 1))
After rotate
((-0, 0, 1), (0, 1, 0), (-1, 0, -0))
((-0, 0, 1), (0, 1, 0), (-1, 0, -0))
```

I am not sure if I understand the concept of global transforms and local transform clearly because as per the documentation they contain two different transforms.

This is the same behavior with `rotate_object_local` as well (but it shouldn’t matter because they both work with local transforms.

Because the global transform is not a totally independent transform, it is the combination of the local transform and its parent’s global transforms.

They represent the same “state”, sort of, just in two different reference frames.
`transform` is in local space, `global_transform` is in world space.

Can we get a code example or something to understand this more in detail? That would be great!

keshav | 2020-04-29 14:54

In other words, `transform` is relative to the parent.
`global_transform` is relative to the world.

Using a simplified analogy, you can see that like in a solar system where the Sun is the center of the world. The Earth is `100` units away from the sun, and the moon is `2` units away from the Earth. That means `2` is the local position of the moon relative to its parent (Earth). Then, `102` would be the global position of the moon (relative to the world’s center, the Sun).

The same happens with `transform` and `global_transform`. Depending on what you want to achieve, you might use one or the other if it suits your needs better.

Zylann | 2020-04-29 15:00