Best way to create a bouncy 3d character controller?

[radiant burrow]

i'm trying to create a 3d character controller that will bounce on collision, getting the bounced velocity vector is easy because the Vector3.bounce function is built-in but i'm struggling with the implementation.
the code so far is this:

func _physics_process(delta: float) -> void:
  # Add the gravity.
  if not is_on_floor():
    velocity.y -= gravity * delta

  if Input.is_action_pressed("jump") and is_on_floor():
    velocity.y += JUMP_VELOCITY

  var input_dir := Input.get_vector("move_left", "move_right", "move_forward", "move_backward")
  var direction := (transform.basis * Vector3(input_dir.x, 0, input_dir.y)).normalized()
  
  velocity.x = decay(velocity, direction * MAX_SPEED, 3, delta).x
  velocity.z = decay(velocity, direction * MAX_SPEED, 3, delta).z

  var prev_velocity = velocity
  move_and_slide()
  
  if get_last_slide_collision():
    get_last_slide_collision().get_collision_count()
    velocity = prev_velocity.bounce(get_last_slide_collision().get_normal(0))

# exponential decay function
func decay(a, b, decay:float, dt:float):
  return b + ( a - b ) * exp(-decay * dt)

this works fine for approximately flat terrain where the normal of the collision points basically up but not for angled collisions, as far as i can tell this is because the bounced velocity is calculated at the end but only applied next physics call so it gets modified by gravity and the movement code. this results in a very weak bounce. how can i solve this?

[abstract sigil]

https://www.youtube.com/watch?v=174vFOCbONI&ab_channel=Arithmetic

this might help

[radiant burrow]

thanks but it does not :p
i know how to bounce the character, i just need to rework the code so it works with gravity and player input

[abstract sigil]

maybe try adjusting the walls?

[radiant burrow]

how?

[abstract sigil]

no idea

but maybe add a script to the walls saying if [player] collides then apply equal force back to it?

[nocturne kayak]

Just adding standard player input and gravity to a bouncing character like the one in that tutorial should work

[radiant burrow]

it does not, as can be seen by my code and explanation of what doesn't work

[nocturne kayak]

could it be that it is because you have the decay formula work with the "direction" and not the dir.x and dir.z now you reduce the speed in both directions by your full direction so as soon as it is angled like a angled collision you basically decay it twice.

[radiant burrow]

if nothing else that's bad code so i'll fix it

the movement decay interpolation does interpolate to 0 if no key is pressed, same as lerp. so it is part of the problem.

but i already knew that

the bounced velocity is calculated at the end but only applied next physics call so it gets modified by gravity and the movement code

what i'm asking here isn't new code necessarily, it's some new way to structure the code i already have to work better