virtualx-engine/doc/classes/SkeletonModificationStack2D.xml
TwistedTwigleg 8aa3c2f091 New and improved IK system for Skeleton2D
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.
2021-06-05 15:19:51 -04:00

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XML

<?xml version="1.0" encoding="UTF-8" ?>
<class name="SkeletonModificationStack2D" inherits="Resource" version="4.0">
<brief_description>
A resource that holds a stack of [SkeletonModification2D]s.
</brief_description>
<description>
This resource is used by the Skeleton and holds a stack of [SkeletonModification2D]s.
This controls the order of the modifications and how they are applied. Modification order is especially important for full-body IK setups, as you need to execute the modifications in the correct order to get the desired results. For example, you want to execute a modification on the spine [i]before[/i] the arms on a humanoid skeleton.
This resource also controls how strongly all of the modifications are applied to the [Skeleton2D].
</description>
<tutorials>
</tutorials>
<methods>
<method name="add_modification">
<return type="void">
</return>
<argument index="0" name="modification" type="SkeletonModification2D">
</argument>
<description>
Adds the passed-in [SkeletonModification2D] to the stack.
</description>
</method>
<method name="delete_modification">
<return type="void">
</return>
<argument index="0" name="mod_idx" type="int">
</argument>
<description>
Deletes the [SkeletonModification2D] at the index position [code]mod_idx[/code], if it exists.
</description>
</method>
<method name="enable_all_modifications">
<return type="void">
</return>
<argument index="0" name="enabled" type="bool">
</argument>
<description>
Enables all [SkeletonModification2D]s in the stack.
</description>
</method>
<method name="execute">
<return type="void">
</return>
<argument index="0" name="delta" type="float">
</argument>
<argument index="1" name="execution_mode" type="int">
</argument>
<description>
Executes all of the [SkeletonModification2D]s in the stack that use the same execution mode as the passed-in [code]execution_mode[/code], starting from index [code]0[/code] to [member modification_count].
[b]Note:[/b] The order of the modifications can matter depending on the modifications. For example, modifications on a spine should operate before modifications on the arms in order to get proper results.
</description>
</method>
<method name="get_is_setup" qualifiers="const">
<return type="bool">
</return>
<description>
Returns a boolean that indiciates whether the modification stack is setup and can execute.
</description>
</method>
<method name="get_modification" qualifiers="const">
<return type="SkeletonModification2D">
</return>
<argument index="0" name="mod_idx" type="int">
</argument>
<description>
Returns the [SkeletonModification2D] at the passed-in index, [code]mod_idx[/code].
</description>
</method>
<method name="get_skeleton" qualifiers="const">
<return type="Skeleton2D">
</return>
<description>
Returns the [Skeleton2D] node that the SkeletonModificationStack2D is bound to.
</description>
</method>
<method name="set_modification">
<return type="void">
</return>
<argument index="0" name="mod_idx" type="int">
</argument>
<argument index="1" name="modification" type="SkeletonModification2D">
</argument>
<description>
Sets the modification at [code]mod_idx[/code] to the passed-in modification, [code]modification[/code].
</description>
</method>
<method name="setup">
<return type="void">
</return>
<description>
Sets up the modification stack so it can execute. This function should be called by [Skeleton2D] and shouldn't be manually called unless you know what you are doing.
</description>
</method>
</methods>
<members>
<member name="enabled" type="bool" setter="set_enabled" getter="get_enabled" default="false">
If [code]true[/code], the modification's in the stack will be called. This is handled automatically through the [Skeleton2D] node.
</member>
<member name="modification_count" type="int" setter="set_modification_count" getter="get_modification_count" default="0">
The number of modifications in the stack.
</member>
<member name="strength" type="float" setter="set_strength" getter="get_strength" default="1.0">
The interpolation strength of the modifications in stack. A value of [code]0[/code] will make it where the modifications are not applied, a strength of [code]0.5[/code] will be half applied, and a strength of [code]1[/code] will allow the modifications to be fully applied and override the [Skeleton2D] [Bone2D] poses.
</member>
</members>
<constants>
</constants>
</class>