PathFollow3D

Inherits: Node3D < Node < Object

Point sampler for a Path3D.

Description

This node takes its parent Path3D, 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 the progress in this node.

Properties

bool

cubic_interp

true

float

h_offset

0.0

bool

loop

true

float

progress

0.0

float

progress_ratio

0.0

RotationMode

rotation_mode

3

bool

tilt_enabled

true

float

v_offset

0.0

Methods

Transform3D

correct_posture ( Transform3D transform, RotationMode rotation_mode ) static


Enumerations

enum RotationMode:

RotationMode ROTATION_NONE = 0

Forbids the PathFollow3D to rotate.

RotationMode ROTATION_Y = 1

Allows the PathFollow3D to rotate in the Y axis only.

RotationMode ROTATION_XY = 2

Allows the PathFollow3D to rotate in both the X, and Y axes.

RotationMode ROTATION_XYZ = 3

Allows the PathFollow3D to rotate in any axis.

RotationMode ROTATION_ORIENTED = 4

Uses the up vector information in a Curve3D to enforce orientation. This rotation mode requires the Path3D's Curve3D.up_vector_enabled property to be set to true.


Property Descriptions

bool cubic_interp = true

  • void set_cubic_interpolation ( bool value )

  • bool get_cubic_interpolation ( )

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

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.


float h_offset = 0.0

  • void set_h_offset ( float value )

  • float get_h_offset ( )

The node's offset along the curve.


bool loop = true

  • void set_loop ( bool value )

  • bool 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 progress = 0.0

  • void set_progress ( float value )

  • float get_progress ( )

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


float progress_ratio = 0.0

  • void set_progress_ratio ( float value )

  • float get_progress_ratio ( )

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.


RotationMode rotation_mode = 3

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


bool tilt_enabled = true

  • void set_tilt_enabled ( bool value )

  • bool is_tilt_enabled ( )

If true, the tilt property of Curve3D takes effect.


float v_offset = 0.0

  • void set_v_offset ( float value )

  • float get_v_offset ( )

The node's offset perpendicular to the curve.


Method Descriptions

Transform3D correct_posture ( Transform3D transform, RotationMode rotation_mode ) static

Correct the transform. rotation_mode implicitly specifies how posture (forward, up and sideway direction) is calculated.