Documentation

follow2d component

Pulls the node's body2d towards the pose of target every fixed step, with rapier's PD or PID controller. node.follow2d.reset_follow() forgets what a PID…

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Properties
Script functions

2d · physics · 12 properties · 2D

Pulls the node's body2d towards the pose of target every fixed step, with rapier's PD or PID controller. node.follow2d.reset_follow() forgets what a PID summed.

In a scene, follow2d is the node key that applies it. A script reaches each property below as a field on node.follow2d: reading one asks the running component, and assigning one leaves the rest alone. The whole table is node.follow2d.get() and node.follow2d.set(table).

Properties

property	type	default	description
`follow_rotation`	bool	`true`	Whether the body is turned to the target's rotation too
`integral_gain`	vec2	`[1,1]`	How hard the gap in position summed over time pulls, per axis, with `pid`
`kind`	enum	`pd`	Rapier's proportional-derivative controller, or the same with an integral that keeps pulling against a steady push One of `pd`, `pid`.
`position_gain`	vec2	`[60,60]`	How hard a gap in position pulls, per axis: about one over the fixed step closes it in one step
`rotation_gain`	float	`60`	How hard a gap in rotation pulls
`rotation_integral_gain`	float	`1`	How hard the gap in rotation summed over time pulls, with `pid`
`spin_gain`	float	`0.8`	How much of a gap in spin a step corrects
`target`	node	—	The node whose pose the body is pulled to; empty pulls nothing
`target_angular_velocity`	float	`0`	The spin the body is pulled to match, radians a second in the file
`target_linear_velocity`	vec2	`[0,0]`	The velocity the body is pulled to match, in world units per second
`translation_axes`	flags	`["x","y"]`	The axes the body is pulled along One of `x`, `y`.
`velocity_gain`	vec2	`[0.8,0.8]`	How much of a gap in velocity a step corrects, per axis: 0 none, 1 all of it

Script functions

Methods of node.follow2d, the handle a node carrying this component exposes. Every handle also has get(), set(table), patch(table), has() and remove().

From physics2d:

method	what it does
`reset_follow()`	Forget what a `pid` follow summed, so it pulls from now as if it had just started.