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Expose low level properties of animation_tree
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@Daylily-Zeleen
Daylily-Zeleen committed May 24, 2023
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284 changes: 143 additions & 141 deletions doc/classes/AnimationTree.xml
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Expand Up @@ -30,146 +30,6 @@
Manually advance the animations by the specified time (in seconds).
</description>
</method>
<method name="get_root_motion_position" qualifiers="const">
<return type="Vector3" />
<description>
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]:
[codeblocks]
[gdscript]
var current_rotation: Quaternion

func _process(delta):
if Input.is_action_just_pressed("animate"):
current_rotation = get_quaternion()
state_machine.travel("Animate")
var velocity: Vector3 = current_rotation * animation_tree.get_root_motion_position() / delta
set_velocity(velocity)
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 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]:
[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())
[/gdscript]
[/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 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]:
[codeblocks]
[gdscript]
var current_scale: Vector3 = Vector3(1, 1, 1)
var scale_accum: Vector3 = Vector3(1, 1, 1)

func _process(delta):
if Input.is_action_just_pressed("animate"):
current_scale = get_scale()
scale_accum = Vector3(1, 1, 1)
state_machine.travel("Animate")
scale_accum += animation_tree.get_root_motion_scale()
set_scale(current_scale * scale_accum)
[/gdscript]
[/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">
Expand All @@ -185,12 +45,154 @@
The number of possible simultaneous sounds for each of the assigned AudioStreamPlayers.
For example, if this value is [code]32[/code] and the animation has two audio tracks, the two [AudioStreamPlayer]s assigned can play simultaneously up to [code]32[/code] voices each.
</member>
<member name="last_process_pass" type="int" setter="set_last_process_pass" getter="get_last_process_pass" default="1">
</member>
<member name="process_callback" type="int" setter="set_process_callback" getter="get_process_callback" enum="AnimationTree.AnimationProcessCallback" default="1">
The process mode of this [AnimationTree]. See [enum AnimationProcessCallback] for available modes.
</member>
<member name="property_map" type="Dictionary" setter="set_property_map" getter="get_property_map" default="{}">
</member>
<member name="root_motion_position" type="Vector3" setter="set_root_motion_position" getter="get_root_motion_position" default="Vector3(0, 0, 0)">
The motion delta of position with the [member root_motion_track] as a [Vector3].
If [member root_motion_track] is not a path to a track of type [constant Animation.TYPE_POSITION_3D], this property will not be updated internally.
See also [member root_motion_track] and [RootMotionView].
The most basic example is applying position to [CharacterBody3D]:
[codeblocks]
[gdscript]
var current_rotation: Quaternion

func _process(delta):
if Input.is_action_just_pressed("animate"):
current_rotation = get_quaternion()
state_machine.travel("Animate")
var velocity: Vector3 = current_rotation * animation_tree.root_motion_position / delta
set_velocity(velocity)
move_and_slide()
[/gdscript]
[/codeblocks]
By using this in combination with [member 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.root_motion_rotation)
var velocity: Vector3 = (animation_tree.root_motion_rotation_accumulator.inverse() * get_quaternion()) * animation_tree.root_motion_position / delta
set_velocity(velocity)
move_and_slide()
[/gdscript]
[/codeblocks]
</member>
<member name="root_motion_position_accumulator" type="Vector3" setter="set_root_motion_position_accumulator" getter="get_root_motion_position_accumulator" default="Vector3(0, 0, 0)">
The blended value of the position tracks with the [member root_motion_track] as a [Vector3].
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.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.
</member>
<member name="root_motion_rotation" type="Quaternion" setter="set_root_motion_rotation" getter="get_root_motion_rotation" default="Quaternion(0, 0, 0, 1)">
The motion delta of rotation with the [member root_motion_track] as a [Quaternion].
If [member root_motion_track] is not a path to a track of type [constant Animation.TYPE_ROTATION_3D], this property will not be updated internally.
See also [member root_motion_track] and [RootMotionView].
The most basic example is applying rotation to [CharacterBody3D]:
[codeblocks]
[gdscript]
func _process(delta):
if Input.is_action_just_pressed("animate"):
state_machine.travel("Animate")
set_quaternion(get_quaternion() * animation_tree.root_motion_rotation)
[/gdscript]
[/codeblocks]
</member>
<member name="root_motion_rotation_accumulator" type="Quaternion" setter="set_root_motion_rotation_accumulator" getter="get_root_motion_rotation_accumulator" default="Quaternion(0, 0, 0, 1)">
The blended value of the rotation tracks with the [member root_motion_track] as a [Quaternion].
This is necessary to apply the root motion position correctly, taking rotation into account. See also [member 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.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.
</member>
<member name="root_motion_scale" type="Vector3" setter="set_root_motion_scale" getter="get_root_motion_scale" default="Vector3(0, 0, 0)">
The motion delta of scale with the [member root_motion_track] as a [Vector3].
If [member root_motion_track] is not a path to a track of type [constant Animation.TYPE_SCALE_3D], this property will not be updated internally.
See also [member root_motion_track] and [RootMotionView].
The most basic example is applying scale to [CharacterBody3D]:
[codeblocks]
[gdscript]
var current_scale: Vector3 = Vector3(1, 1, 1)
var scale_accum: Vector3 = Vector3(1, 1, 1)

func _process(delta):
if Input.is_action_just_pressed("animate"):
current_scale = get_scale()
scale_accum = Vector3(1, 1, 1)
state_machine.travel("Animate")
scale_accum += animation_tree.root_motion_scale
set_scale(current_scale * scale_accum)
[/gdscript]
[/codeblocks]
</member>
<member name="root_motion_scale_accumulator" type="Vector3" setter="set_root_motion_scale_accumulator" getter="get_root_motion_scale_accumulator" default="Vector3(1, 1, 1)">
The blended value of the scale tracks with the [member root_motion_track] as a [Vector3].
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.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.
</member>
<member name="root_motion_track" type="NodePath" setter="set_root_motion_track" getter="get_root_motion_track" default="NodePath(&quot;&quot;)">
The path to the Animation track used for root motion. Paths must be valid scene-tree paths to a node, and must be specified starting from the parent node of the node that will reproduce the animation. To specify a track that controls properties or bones, append its name after the path, separated by [code]":"[/code]. For example, [code]"character/skeleton:ankle"[/code] or [code]"character/mesh:transform/local"[/code].
If the track has type [constant Animation.TYPE_POSITION_3D], [constant Animation.TYPE_ROTATION_3D] or [constant Animation.TYPE_SCALE_3D] the transformation will be canceled visually, and the animation will appear to stay in place. See also [method get_root_motion_position], [method get_root_motion_rotation], [method get_root_motion_scale] and [RootMotionView].
If the track has type [constant Animation.TYPE_POSITION_3D], [constant Animation.TYPE_ROTATION_3D] or [constant Animation.TYPE_SCALE_3D] the transformation will be canceled visually, and the animation will appear to stay in place. See also [member root_motion_position], [member root_motion_rotation], [member root_motion_scale] and [RootMotionView].
</member>
<member name="started" type="bool" setter="set_started" getter="is_started" default="true">
</member>
<member name="state_animation_states" type="Dictionary[]" setter="set_state_animation_states" getter="get_state_animation_states" default="[]">
</member>
<member name="state_invalid" type="bool" setter="set_state_invalid" getter="is_state_invalid" default="true">
</member>
<member name="state_invalid_reasons" type="String" setter="set_state_invalid_reasons" getter="get_state_invalid_reasons" default="&quot;&quot;">
</member>
<member name="state_last_pass" type="int" setter="set_state_last_pass" getter="get_state_last_pass" default="0">
</member>
<member name="state_player" type="AnimationPlayer" setter="set_state_player" getter="get_state_player">
</member>
<member name="state_track_count" type="int" setter="set_state_track_count" getter="get_state_track_count" default="0">
</member>
<member name="state_track_map" type="Dictionary" setter="set_state_track_map" getter="get_state_track_map" default="{}">
</member>
<member name="tree_root" type="AnimationNode" setter="set_tree_root" getter="get_tree_root">
The root animation node of this [AnimationTree]. See [AnimationNode].
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