It is useful for making other nodes follow a path, without coding the movement pattern. For that, the nodes must be children of this node. The descendant nodes will then move accordingly when setting the [member progress] in this node.
The points along the [Curve3D] of the [Path3D] are precomputed before use, for faster calculations. The point at the requested offset is then calculated interpolating between two adjacent cached points. This may present a problem if the curve makes sharp turns, as the cached points may not follow the curve closely enough.
There are two answers to this problem: either increase the number of cached points and increase memory consumption, or make a cubic interpolation between two points at the cost of (slightly) slower calculations.
The distance from the first vertex, considering 0.0 as the first vertex and 1.0 as the last. This is just another way of expressing the progress within the path, as the progress supplied is multiplied internally by the path's length.
It can be set or get only if the [PathFollow3D] is the child of a [Path3D] which is part of the scene tree, and that this [Path3D] has a [Curve3D] with a non-zero length. Otherwise, trying to set this field will print an error, and getting this field will return [code]0.0[/code].
If [code]true[/code], the node moves on the travel path with orienting the +Z axis as forward. See also [constant Vector3.FORWARD] and [constant Vector3.MODEL_FRONT].
Uses the up vector information in a [Curve3D] to enforce orientation. This rotation mode requires the [Path3D]'s [member Curve3D.up_vector_enabled] property to be set to [code]true[/code].
