PathFollow

PathFollow

Point sampler for a Path.

Description

This node takes its parent Path, and returns the coordinates of a point within it, given a distance from the first vertex.

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 an offset in this node.

Properties

bool	cubic_interp	`true`
float	h_offset	`0.0`
bool	loop	`true`
float	offset	`0.0`
RotationMode	rotation_mode	`3`
float	unit_offset	`0.0`
float	v_offset	`0.0`

Enumerations

enum RotationMode:

ROTATION_NONE = 0 —- Forbids the PathFollow to rotate.
ROTATION_Y = 1 —- Allows the PathFollow to rotate in the Y axis only.
ROTATION_XY = 2 —- Allows the PathFollow to rotate in both the X, and Y axes.
ROTATION_XYZ = 3 —- Allows the PathFollow to rotate in any axis.
ROTATION_ORIENTED = 4 —- Uses the up vector information in a Curve3D to enforce orientation. This rotation mode requires the Path‘s Curve3D.up_vector_enabled property to be set to true.

Property Descriptions

bool cubic_interp

Default	`true`
Setter	set_cubic_interpolation(value)
Getter	get_cubic_interpolation()

If true, the position between two cached points is interpolated cubically, and linearly otherwise.

The points along the Curve3D of the Path 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.

float h_offset

Default	`0.0`
Setter	set_h_offset(value)
Getter	get_h_offset()

The node’s offset along the curve.

bool loop

Default	`true`
Setter	set_loop(value)
Getter	has_loop()

If true, any offset outside the path’s length will wrap around, instead of stopping at the ends. Use it for cyclic paths.

float offset

Default	`0.0`
Setter	set_offset(value)
Getter	get_offset()

The distance from the first vertex, measured in 3D units along the path. This sets this node’s position to a point within the path.

RotationMode rotation_mode

Default	`3`
Setter	set_rotation_mode(value)
Getter	get_rotation_mode()

Allows or forbids rotation on one or more axes, depending on the RotationMode constants being used.

float unit_offset

Default	`0.0`
Setter	set_unit_offset(value)
Getter	get_unit_offset()

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 offset within the path, as the offset supplied is multiplied internally by the path’s length.

float v_offset

Default	`0.0`
Setter	set_v_offset(value)
Getter	get_v_offset()

The node’s offset perpendicular to the curve.