Get the current frame position

timoraes

How to get the frame position, not the time position, in AnimationPlayer for 3D animations?

godot 4.2

xyz

timoraes AnimationPlayer doesn't measure time in frames. If you want to convert time to frames multiply it by current framerate. Note that this will only make sense if you can guarantee a stable fixed framerate. What's your actual goal with this?

timoraes

xyz Need to execute logic at exactly frame of the animation. Time position isn't reliable.

xyz

timoraes Where do the frames come from?

SnapCracklins

timoraes you probably need to use an Animated Sprite then you can check the animation frames in real time. Simple as:

if $AnimatedSprite.frame == _myFrameValue:
        ### do stuff

Or you can create a signal and emit it when it hits that frame and tie a function to it.

signal frameReached

if $AnimatedSprite.frame == _myFrameValue:
        emit_signal("frameReached")

func _on_frameReached():
      ### alternatively do stuff
      ### just remember to connect this either in editor or at ready()

timoraes

xyz The animation was imported from blender

timoraes

SnapCracklins Forgot to mention that is a 3D animation

xyz

timoraes Blender, like all other 3d app, uses a continuous timeline, not discrete frames. You can switch time units to seconds in Blender, determine the exact time at which the thing needs to happen and use a timer to trigger it. Alternatively, in Godot you can add a call method track to your animation. Every key of such track can call a method. Position the keys at wanted times and provide methods to be called.

Jesusemora

xyz add a call method track to your animation.

This is buggy and I don't recomend it.
What I do is look at the animations in the animationplayer, where it shows the seconds, I write them down and then in my script I have a match with the names of the animations and code for each. (match checks against the current animation name).
In each animation I check if time is within the ranges, like:

if animpos > 0.5 and animpos < 0.6:
     Attack()

And when the attack triggers I start a mini-timer so that it executes once.
It is a range and not a single value because you can't check the value of a changing float, floats store aproximate values.
You could however convert them to frames as int:
var myframe : int = round(animpos * 60.0)
And then check the frame:
if myframe == 30:

timoraes

xyz Blender, like all other 3d app, uses a continuous timeline, not discrete frames.

But in blender i navigate through frames in timeline, not seconds.

Jesusemora And when the attack triggers I start a mini-timer so that it executes once.

Can you show me a example on how to use timer for this? Creating a pseudo-frame is not safe due to FPS variation

xyz

Jesusemora This is buggy

Can you demonstrate a bug?

Jesusemora

xyz I tried it and didn't like it. You tie the animations to a script, if you are using animation libraries you have to make the animations external and create a copy in order to edit them, for each animation.
My system is modular, I can reuse the script on a different scene with a different animationplayer and different animations, and it doesn't matter if an animation is missing.

xyz

Jesusemora I wouldn't call that exactly "buggy". Still might be preferable to doing time range checks on per frame basis, especially if you have many such keys. Better leave to native code to do that and call you back. As for flexibility, a script can be mede to convert one of imported asset tracks into a call track.

spaceyjase

timoraes why not use a call method track to the animation timeline?

https://docs.godotengine.org/en/stable/tutorials/animation/animation_track_types.html#call-method-track

Jesusemora

timoraes in blender i navigate through frames in timeline, not seconds.

blender uses frames, yes, but frames alone mean nothing. animation is run in frames-per-second. usually animations run at 24-30-60 FPS.
with modern animation techniques, not all "frames" are filled with keys, and even if so, the software still calculates the transforms as an interpolation between two keys given the current time. this is why godot uses seconds, the animation runs from 0.0 to 10.0 and we get a point in the animation, calculated from the current time. This way we can run animations that have 24FPS at 60FPS or higher, which results in smooth transitions.
So if you want something to trigger at frame 30, and the animation runs at 30 FPS, it would have to execute at exactly 1.0 seconds, which is impossible because of float rounding errors and the time since last frame can end up skipping if there's lag. So instead we execute code in between two values, so instead of pos == 1.0, we do pos > 0.9 and pos < 1.1. It could be MORE exact, but it's unlikely to be noticeable in a game.

timoraes Can you show me a example on how to use timer for this? Creating a pseudo-frame is not safe due to FPS variation

here's code from one of my projects, with some comments:

var interact_timer : float = 0.0#this changes all the time
var interact_limit : float = 0.1#this is how long the timer is
func _physics_process(delta):
	if interact_timer < interact_limit:
		interact_timer += delta #here delta is supposed to be the same every time because _physics_process runs 60 times per second

func Attack(DAM : int) -> void:
	if weapon_collision:
		if weapon_collision.has_overlapping_bodies():
			for i in weapon_collision.get_overlapping_bodies():
				if i.has_method("Damage"):
					if interact_timer > interact_limit:#timer has finished so we run the function
						i.Damage(unique_id, DAM)
						interact_timer = 0.0 #we start the timer

xyz

timoraes But in blender i navigate through frames in timeline, not seconds.

Frames in blender are just continuous units, like seconds. They are not discrete frames. So the time expressed in frames can be decimal, like 2.38. It's just a different unit. I already suggested above how to convert between seconds and frames.