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Add root motion accumulator to fix broken RootMotionView

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This commit is contained in:
Silc Renew
2023-02-08 06:57:00 +09:00
parent 2572f6800a
commit 7b18ad7d98
4 changed files with 149 additions and 29 deletions
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doc/classes/AnimationTree.xml
+81 -3
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@@ -33,7 +33,7 @@
<method name="get_root_motion_position" qualifiers="const">
<return type="Vector3" />
<description>
Retrieve the motion of position with the [member root_motion_track] as a [Vector3] that can be used elsewhere.
Retrieve the motion delta of position with the [member root_motion_track] as a [Vector3] that can be used elsewhere.
If [member root_motion_track] is not a path to a track of type [constant Animation.TYPE_POSITION_3D], returns [code]Vector3(0, 0, 0)[/code].
See also [member root_motion_track] and [RootMotionView].
The most basic example is applying position to [CharacterBody3D]:
@@ -50,12 +50,46 @@
move_and_slide()
[/gdscript]
[/codeblocks]
By using this in combination with [method get_root_motion_position_accumulator], you can apply the root motion position more correctly to account for the rotation of the node.
[codeblocks]
[gdscript]
func _process(delta):
if Input.is_action_just_pressed("animate"):
state_machine.travel("Animate")
set_quaternion(get_quaternion() * animation_tree.get_root_motion_rotation())
var velocity: Vector3 = (animation_tree.get_root_motion_rotation_accumulator().inverse() * get_quaternion()) * animation_tree.get_root_motion_position() / delta
set_velocity(velocity)
move_and_slide()
[/gdscript]
[/codeblocks]
</description>
</method>
<method name="get_root_motion_position_accumulator" qualifiers="const">
<return type="Vector3" />
<description>
Retrieve the blended value of the position tracks with the [member root_motion_track] as a [Vector3] that can be used elsewhere.
This is useful in cases where you want to respect the initial key values of the animation.
For example, if an animation with only one key [code]Vector3(0, 0, 0)[/code] is played in the previous frame and then an animation with only one key [code]Vector3(1, 0, 1)[/code] is played in the next frame, the difference can be calculated as follows:
[codeblocks]
[gdscript]
var prev_root_motion_position_accumulator: Vector3
func _process(delta):
if Input.is_action_just_pressed("animate"):
state_machine.travel("Animate")
var current_root_motion_position_accumulator: Vector3 = animation_tree.get_root_motion_position_accumulator()
var difference: Vector3 = current_root_motion_position_accumulator - prev_root_motion_position_accumulator
prev_root_motion_position_accumulator = current_root_motion_position_accumulator
transform.origin += difference
[/gdscript]
[/codeblocks]
However, if the animation loops, an unintended discrete change may occur, so this is only useful for some simple use cases.
</description>
</method>
<method name="get_root_motion_rotation" qualifiers="const">
<return type="Quaternion" />
<description>
Retrieve the motion of rotation with the [member root_motion_track] as a [Quaternion] that can be used elsewhere.
Retrieve the motion delta of rotation with the [member root_motion_track] as a [Quaternion] that can be used elsewhere.
If [member root_motion_track] is not a path to a track of type [constant Animation.TYPE_ROTATION_3D], returns [code]Quaternion(0, 0, 0, 1)[/code].
See also [member root_motion_track] and [RootMotionView].
The most basic example is applying rotation to [CharacterBody3D]:
@@ -69,10 +103,33 @@
[/codeblocks]
</description>
</method>
<method name="get_root_motion_rotation_accumulator" qualifiers="const">
<return type="Quaternion" />
<description>
Retrieve the blended value of the rotation tracks with the [member root_motion_track] as a [Quaternion] that can be used elsewhere.
This is necessary to apply the root motion position correctly, taking rotation into account. See also [method get_root_motion_position].
Also, this is useful in cases where you want to respect the initial key values of the animation.
For example, if an animation with only one key [code]Quaternion(0, 0, 0, 1)[/code] is played in the previous frame and then an animation with only one key [code]Quaternion(0, 0.707, 0, 0.707)[/code] is played in the next frame, the difference can be calculated as follows:
[codeblocks]
[gdscript]
var prev_root_motion_rotation_accumulator: Quaternion
func _process(delta):
if Input.is_action_just_pressed("animate"):
state_machine.travel("Animate")
var current_root_motion_rotation_accumulator: Quaternion = animation_tree.get_root_motion_Quaternion_accumulator()
var difference: Quaternion = prev_root_motion_rotation_accumulator.inverse() * current_root_motion_rotation_accumulator
prev_root_motion_rotation_accumulator = current_root_motion_rotation_accumulator
transform.basis *= difference
[/gdscript]
[/codeblocks]
However, if the animation loops, an unintended discrete change may occur, so this is only useful for some simple use cases.
</description>
</method>
<method name="get_root_motion_scale" qualifiers="const">
<return type="Vector3" />
<description>
Retrieve the motion of scale with the [member root_motion_track] as a [Vector3] that can be used elsewhere.
Retrieve the motion delta of scale with the [member root_motion_track] as a [Vector3] that can be used elsewhere.
If [member root_motion_track] is not a path to a track of type [constant Animation.TYPE_SCALE_3D], returns [code]Vector3(0, 0, 0)[/code].
See also [member root_motion_track] and [RootMotionView].
The most basic example is applying scale to [CharacterBody3D]:
@@ -92,6 +149,27 @@
[/codeblocks]
</description>
</method>
<method name="get_root_motion_scale_accumulator" qualifiers="const">
<return type="Vector3" />
<description>
Retrieve the blended value of the scale tracks with the [member root_motion_track] as a [Vector3] that can be used elsewhere.
For example, if an animation with only one key [code]Vector3(1, 1, 1)[/code] is played in the previous frame and then an animation with only one key [code]Vector3(2, 2, 2)[/code] is played in the next frame, the difference can be calculated as follows:
[codeblocks]
[gdscript]
var prev_root_motion_scale_accumulator: Vector3
func _process(delta):
if Input.is_action_just_pressed("animate"):
state_machine.travel("Animate")
var current_root_motion_scale_accumulator: Vector3 = animation_tree.get_root_motion_scale_accumulator()
var difference: Vector3 = current_root_motion_scale_accumulator - prev_root_motion_scale_accumulator
prev_root_motion_scale_accumulator = current_root_motion_scale_accumulator
transform.basis = transform.basis.scaled(difference)
[/gdscript]
[/codeblocks]
However, if the animation loops, an unintended discrete change may occur, so this is only useful for some simple use cases.
</description>
</method>
</methods>
<members>
<member name="active" type="bool" setter="set_active" getter="is_active" default="false">