Help with smoothing and blendspace

[m4th1eu]

Hellooo !

I’m currently trying to smoothly animate my character.
For this I’ve created an AnimPlayer as a NodeBlendTree and in there added a BlendSpace2D for my walking in all directions animations.

Everything works except the smooth animations, I’ve read on the following post that I should use lerp() to smooth the values I send to the blendspace2d but I’m having trouble with the lerp function and how it works.

Should BlendSpace2D smooth/transition values?

Attention Topic was automatically imported from the old Question2Answer platform. Asked By AdamActual Hi all, I’m currently converting a setup I had in Unity to Godot. And using the BlendSpace2D I’ve noticed that it doesn’t transition values applied to it. Meaning if x is -1 and I set it to 1, the character snaps to the animation at x=1, instead of smoothly transitioning to it. Is there a way to enable smoothing that transition? I can o…

In _physics_process, i have this :

var moving := Input.get_vector("left", "right", "forward", "backward")

if current_speed <= BASE_SPEED:
	animTree.set("parameters/MovType/transition_request", "walking")
	animTree.set("parameters/LocomotionWalking/blend_position", moving)

I can see that my values from input_dir are between -1 and 1 on both the x and y as the previous post talked about.

Could someone point me in the right direction to smooth those values ?
I tried that but ended with very strange results :

moving.x = lerp(0.0, moving.x, delta)
moving.y = lerp(0.0, moving.y, delta)

Any help would be greatly appreciated!
Thanks

[Monday]

i’m not sure i completely understand how you code works but you could try something like:
moving = lerp(moving, input_dir, delta)
this will make the moving variable smoothly follow input_dir
edit: moving needs to be declared outside of _physics_process, so it doesn’t “reset” every frame. you can multiply delta to make the transition faster.

[m4th1eu]

Thanks for the reply, sorry for the misunderstanding, the input_dir is actually the moving variable, I forgot to rename it in the example I posted here.
I will try what you said and report back.

[m4th1eu]

Okay, so I’ve tried to do what you proposed but can’t seem to get it right.

This is my code at the moment :

func _physics_process(delta: float) -> void:
	var input_dir := Input.get_vector("left", "right", "forward", "backward")

	# Only update state if playing can move, otherwise set to idle.
	if is_jumping_enabled or is_running_enabled or is_walking_enabled:	
		
		# Walking
		if current_speed <= BASE_SPEED:
			animTree.set("parameters/MovType/transition_request", "walking")
			animTree.set("parameters/LocomotionWalking/blend_position", input_dir)
		else: # Running
			animTree.set("parameters/MovType/transition_request", "running")
			animTree.set("parameters/LocomotionRunning/blend_position", input_dir)

The input_dir retrieves a vector based on my WASD keys and then passes it to the animation blend 2d in the animation tree, and then plays the right animations.

How would I move input_dir outside of physics process ? I’ve tried creating another variable based on the last state from input_dir and then lerping between the two but it doesn’t work…

Thanks for your help.

[Monday]

is this how you tried it? input_dir doesn’t have to be outside of _physics_process, the variable that is being lerped does, and that should be used to set the animations.

var anim_blend := Vector2.ZERO

func _physics_process(delta: float) -> void:
	var input_dir := Input.get_vector("left", "right", "forward", "backward")

    anim_blend = lerp(anim_blend, input_dir, delta * 5)

	# Only update state if playing can move, otherwise set to idle.
	if is_jumping_enabled or is_running_enabled or is_walking_enabled:	
		
		# Walking
		if current_speed <= BASE_SPEED:
			animTree.set("parameters/MovType/transition_request", "walking")
			animTree.set("parameters/LocomotionWalking/blend_position", anim_blend)
		else: # Running
			animTree.set("parameters/MovType/transition_request", "running")
			animTree.set("parameters/LocomotionRunning/blend_position", anim_blend)

[m4th1eu]

This works! Thanks a lot, I’ll try to understand in more details for the near future.

Have a great day, thank you