Add acceleration and friction to the Navigation Agent

[hidemat]

It would be nice to add this to the NavigationAgent so that when the safe_velocity is calculated, it also takes into account acceleration and friction so that the movement feels smoother and less snappy.

[Calinou]

Can this be accomplished by using NavigationAgent to move a target point, and having your character follow the target point using their given acceleration and friction?

[hidemat]

I tried before but got some weird behavior, but upon further inspection of my code I got it to work ... I think. For reference here is my code:

extends RigidDynamicBody3D

#Internal Dependencies
@onready var _navAgent:NavigationAgent3D = $NavAgent

#Configuration
@export var _speed:int = 10
@export_range(0,1) var _acceleration:float = 0.1
@export_range(0,1) var _friction:float = 0.01

var _target:Vector3

func _ready() -> void:
	_navAgent.set_target_location(global_transform.origin)

func SetTarget(pos:Vector3) -> void:
	_target = pos
	_navAgent.set_target_location(_target)

func _integrate_forces(state: PhysicsDirectBodyState3D) -> void:
	if _navAgent.is_target_reachable() and _navAgent.distance_to_target() > 2:
		var next = _navAgent.get_next_location()
		var direction = global_transform.origin.direction_to(next).normalized()
		var _velocity = direction * _speed
		_navAgent.set_velocity(_velocity)
	else:
		linear_velocity = linear_velocity.slerp(Vector3.ZERO, _friction)


func _on_nav_agent_velocity_computed(s: Vector3) -> void:
	linear_velocity = linear_velocity.slerp(Vector3(s.x, linear_velocity.y, s.z), _acceleration)

[hidemat]

How ever this gives me an error:

E 0:00:02:0244   _on_nav_agent_velocity_computed: The axis Vector3 must be normalized.
  <C++ Error>    Condition "!p_axis.is_normalized()" is true.
  <C++ Source>   core/math/basis.cpp:906 @ set_axis_angle()
  <Stack Trace>  AgentMover.gd:42 @ _on_nav_agent_velocity_computed()