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New and improved IK system for Skeleton2D

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This PR and commit adds a new IK system for 2D with the Skeleton2D node
that adds several new IK solvers, a way to control bones in a Skeleton2D
node similar to that in Skeleton3D. It also adds additional changes
and functionality.

This work was sponsored by GSoC 2020 and TwistedTwigleg.

Full list of changes:
* Adds a SkeletonModifier2D resource
  * This resource is the base where all IK code is written and executed
  * Has a function for clamping angles, since it is so commonly used
  * Modifiers are unique when duplicated so it works with instancing
* Adds a SkeletonModifierStack2D resource
  * This resource manages a series of SkeletonModification2Ds
  * This is what the Skeleton2D directly interfaces with to make IK possible
* Adds SkeletonModifier2D resources for LookAt, CCDIK, FABRIK, Jiggle, and TwoBoneIK
  * Each modification is in its own file
  * There is also a SkeletonModifier2D resource that acts as a stack for using multiple stacks together
* Adds a PhysicalBone2D node
  * Works similar to the PhysicalBone3D node, but uses a RigidBody2D node
* Changes to Skeleton2D listed below:
  * Skeleton2D now holds a single SkeletonModificationStack2D for IK
  * Skeleton2D now has a local_pose_override, which overrides the Bone2D position similar to how the overrides work in Skeleton3D
* Changes to Bone2D listed below:
  * The default_length property has been changed to length. Length is the length of the bone to its child bone node
  * New bone_angle property, which is the angle the bone has to its first child bone node
  * Bone2D caches its transform when not modified by IK for IK interpolation purposes
  * Bone2D draws its own editor gizmo, though this is stated to change in the future
* Changes to CanvasItemEditor listed below:
  * Bone2D gizmo drawing code removed
  * The 2D IK code is removed. Now Bone2D is the only bone system for 2D
* Transform2D now has a looking_at function for rotating to face a position
* Two new node notifications: NOTIFICATION_EDITOR_PRE_SAVE and NOTIFICATION_EDITOR_POST_SAVE
  * These notifications only are called in the editor right before and after saving a scene
  * Needed for not saving the IK position when executing IK in the editor
* Documentation for all the changes listed above.
This commit is contained in:
TwistedTwigleg 2020-08-03 14:02:24 -04:00
parent 7085c0d801
commit 8aa3c2f091
47 changed files with 6591 additions and 613 deletions
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54
doc/classes/Skeleton2D.xml
View file

@ -10,6 +10,17 @@
<link title="2D skeletons">https://docs.godotengine.org/en/latest/tutorials/animation/2d_skeletons.html</link>
</tutorials>
<methods>
<method name="execute_modifications">
<return type="void">
</return>
<argument index="0" name="execution_mode" type="float">
</argument>
<argument index="1" name="execution_mode" type="int">
</argument>
<description>
Executes all the modifications on the [SkeletonModificationStack2D], if the Skeleton3D has one assigned.
</description>
</method>
<method name="get_bone">
<return type="Bone2D">
</return>
@ -26,6 +37,22 @@
Returns the number of [Bone2D] nodes in the node hierarchy parented by Skeleton2D.
</description>
</method>
<method name="get_bone_local_pose_override">
<return type="Transform2D">
</return>
<argument index="0" name="bone_idx" type="int">
</argument>
<description>
Returns the local pose override transform for [code]bone_idx[/code].
</description>
</method>
<method name="get_modification_stack" qualifiers="const">
<return type="SkeletonModificationStack2D">
</return>
<description>
Returns the [SkeletonModificationStack2D] attached to this skeleton, if one exists.
</description>
</method>
<method name="get_skeleton" qualifiers="const">
<return type="RID">
</return>
@ -33,10 +60,37 @@
Returns the [RID] of a Skeleton2D instance.
</description>
</method>
<method name="set_bone_local_pose_override">
<return type="void">
</return>
<argument index="0" name="bone_idx" type="int">
</argument>
<argument index="1" name="override_pose" type="Transform2D">
</argument>
<argument index="2" name="strength" type="float">
</argument>
<argument index="3" name="persistent" type="bool">
</argument>
<description>
Sets the local pose transform, [code]pose[/code], for the bone at [code]bone_idx[/code].
[code]amount[/code] is the interpolation strengh that will be used when applying the pose, and [code]persistent[/code] determines if the applied pose will remain.
[b]Note:[/b] The pose transform needs to be a local transform relative to the [Bone2D] node at [code]bone_idx[/code]!
</description>
</method>
<method name="set_modification_stack">
<return type="void">
</return>
<argument index="0" name="modification_stack" type="SkeletonModificationStack2D">
</argument>
<description>
Sets the [SkeletonModificationStack2D] attached to this skeleton.
</description>
</method>
</methods>
<signals>
<signal name="bone_setup_changed">
<description>
Emitted when the [Bone2D] setup attached to this skeletons changes. This is primarily used internally within the skeleton.
</description>
</signal>
</signals>