Getting local point position in global space is confusing

[JohnTheCoolingFan]

I need to take a local vector from Transform::back for example and recalculate it to global space (rapier's ExternalForce applied at a point requires that). I found transform_point in Transform and GlobalTransform, but got confused by the documentation, I don't understand what these functions do and which one I should use for my task.

[tim-blackbird]

Transform::back is not a position but a normalized vector.
You can use global_transform.affine().transform_vector3(vector).normalize() to transform a local normalized vector to a global one.

GlobalTransform::transform_point is for positions and the docs on it are currently wrong and state the opposite of what it actually does (It actually transforms the point from local to global).

For Transform::back you can use GlobalTransform::back instead.

[JohnTheCoolingFan]

I got point position an vector confused because they are both Vec3... But anyways, I do need to convert local vector to global in a system. One system sets the local vector in a component, other uses that to get a global vector for thrust and torque. Thanks for your solution (global_transform.affine().transform_vector3(vector).normalize()), I'll try that.