Clarify relationship between basis and transform properties of Node3D

[marcospb19]

I'm confused about which Transform3D the Node3D.basis docs refer to:

• self.transform.basis, or
• self.global_transform.basis

This PR edits the Node3D.basis description to clarify this, although I'm not sure I guessed the right one.

[fire]

The Transform3D can be in more global space (it's not global to the root if it is outside the tree.) or can be in local space.

The global transform calculation does caching because the ordinary use requires going through all the parent Node3D global_transforms, getting their transforms and then concatenating them.

The 3x4 Transform3D matrix has an Vector3 origin and a 3x3 basis matrix.

[marcospb19]

@fire

The Transform3D can be in more global space (it's not global to the root if it is outside the tree.) or can be in local space.

The global transform calculation does caching because the ordinary use requires going through all the parent Node3D global_transforms, getting their transforms and then concatenating them.

The 3x4 Transform3D matrix has an Vector3 origin and a 3x3 basis matrix.

Thanks for the extra explanation on caching.

---

The doubt I had was: if .basis is a shorthand for a Transform3D property, and this class has two Transform3D properties, then the docs should be more specific about which one it points to.

godot/scene/3d/node_3d.cpp

Lines 295 to 298 in cc6a609

	Basis Node3D::get_basis() const {
	ERR_READ_THREAD_GUARD_V(Basis());
	return get_transform().basis;
	}

Found this code, so it's the non-global one.

@YuriSizov I applied the suggested change and force-pushed.

[YuriSizov]

Sorry, I should've mentioned it from the getgo, but can you please amend your commit message. It doesn't really follow our preferred style. You can use the current title of the PR, for instance.

[akien-mga]

Sorry, I should've mentioned it from the getgo, but can you please amend your commit message. It doesn't really follow our preferred style. You can use the current title of the PR, for instance.

Did the change myself in the end.

[akien-mga]

Thanks! And congrats for your first merged Godot contribution 🎉

[YuriSizov]

It's a nice clarification, but I'll skip it from cherry-picking so we don't invalidate existing translations.