Tweening a rotation that goes past TAU or below 0

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1

Godot Version

4.4-stable

Question

I am writing a tween function for a rotating turret in a 2d game. The turret is supposed to follow the mouse or get locked onto a target. All that works fine.

The issue is that when the turret loops past a full circle (TAU or 0) it will tween along the scale 0 - TAU. This means that if I am following something up past 360 degrees (to say, 15 degrees) the tween will interpolate from 360-15 instead of 360 to 375.

How do I get the tween to go past the max angle or below the min angle?

2

Are you using angles or radians to rotate?

Radians are safer to use.

3

You could use lerp_angle() within the MethodTweener.

	var tween: Tween = create_tween()
	tween.tween_method(
		func(value: float) -> void:
			rotation = lerp_angle(start_rotation, end_rotation, value),
		0.0,
		1.0,
		2.0
	)
4

It’s all radians in the end.

5

That did it! Thank you very much. I think this info should be added to the tween docs.

1 Like
6

You can add a comment to the Tween docs, maybe that’ll help someone :slight_smile:

7

Already done! :slight_smile:

1 Like