How do I get local space vectors?

Question

For example what is Godot's equivalent of Unity's Vector3.up?

EDIT : No, wait, shit, I meant the equivalent of transform.up, to get the direction of a rotated object's local up vector.

Answer 1

The Vector3's class constants are Godot's global (world) directions. Vector3.UP, Vector3.FORWARD, Vector3.LEFT, etc.
Note that Unity's forward direction is the position Z-axis while Godot's forward direction is the negative Z-axis. The back directions are also inverted.

The local space direction of a 3D node is called Basis and it can be accessed with global_transform.basis.

• global_transform.basis.x is the local right direction.
• global_transform.basis.y is the local up direction.
• global_transform.basis.z is the local back direction.

Comments

Ok thank you, this is what I needed.

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Why isn´t there a linearvelocity.basis? that would be too easy i guess... :D
OK no seriously. How to get a linearvelocity from basis?
I want a script like:

If linear_velocity.z <= -0.2:
<= $tracks...
<=...
<=...

But if the vehicle/object passes 90 degrees the velocity turns from - to + because its the 3d space z axis. Thats really disturbing. I hope somone can help me there.

Answer 2

I'm not familiar with Unity at all, but according to this it's just a shorthand notation? Godot's uses very similar ones, take a look here: it's Vector3.UP.

Not sure what this has to do with "local space" though...