Documentation

wheel3d component

One wheel of the vehicle3d above it; the node's position on the chassis is where its ray starts. physics3d.set_engine_force, set_brake and set_steering…

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Properties
Script functions

3d · physics · 11 properties · 3D

One wheel of the vehicle3d above it; the node's position on the chassis is where its ray starts. physics3d.set_engine_force, set_brake and set_steering drive it.

In a scene, wheel3d is the node key that applies it. A script reaches each property below as a field on node.wheel3d: reading one asks the running component, and assigning one leaves the rest alone. The whole table is node.wheel3d.get() and node.wheel3d.set(table).

Properties

property	type	default	description
`axle`	vec3	`[-1,0,0]`	The axle the wheel turns about, in the chassis's own space
`damping_compression`	float	`0.82`	Damping while the suspension is being squashed At least 0.
`damping_relaxation`	float	`0.88`	Damping while the suspension is coming back At least 0.
`friction_slip`	float	`10.5`	Grip along the wheel's rolling direction; lower slides more At least 0.
`radius`	float	`0.4`	The wheel's radius, which is how far off the ground it holds the ray's end At least 0.01.
`rest_length`	float	`0.3`	How long the suspension is with no weight on it At least 0.
`side_friction`	float	`1`	Grip sideways: what stops the car sliding out of a corner At least 0.
`suspension_direction`	vec3	`[0,-1,0]`	Which way the suspension pushes, in the chassis's own space: down
`suspension_max_force`	float	`6000`	The most force this suspension may push the chassis with At least 0.
`suspension_stiffness`	float	`30`	Spring stiffness, scaled by the chassis's mass: higher is a stiffer, twitchier car At least 0.
`suspension_travel`	float	`5`	How far the suspension may move either side of its rest length At least 0.

Script functions

Methods of node.wheel3d, the handle a node carrying this component exposes. Every handle also has get(), set(table), patch(table), has() and remove().

From physics3d:

method	what it does
`set_brake(float)`	How hard this wheel brakes, as an impulse; ignored while its engine force is not 0.
`set_engine_force(float)`	How hard this wheel drives, in newtons; negative reverses.
`set_steering(float)`	Turn this wheel, in radians.
`set_wheel_rotation(float)`	Set how far the wheel has turned about its axle, in radians: the angle `wheel_state` reads as `rotation`.
`wheel_state() -> any`	What the last step did with this wheel: `#{ rotation, suspension_force, in_contact, engine_force, brake, steering, forward_impulse, side_impulse, contact_normal, contact_point, suspension_length, ray_origin, ground, center, suspension, axle }`. `suspension_force` is what the suspension pushed with, after `suspension_max_force`; the two impulses are the friction rapier applied along and across the wheel; the contact, the ray's start, the wheel's centre and its suspension and axle directions are world space, after steering; `ground` is the node the ray hit, or nil.