A node for inverse kinematics which may modify more than one bone. Base class of [SkeletonModifier3D]s that has some joint lists and applies inverse kinematics. This class has some structs, enums, and helper methods which are useful to solve inverse kinematics. https://godotengine.org/article/inverse-kinematics-returns-to-godot-4-6/#ikmodifier3d-and-7-child-classes Clears all settings. Returns the number of settings. Resets a state with respect to the current bone pose. Sets the number of settings. If [code]true[/code], the solver retrieves the bone axis from the bone pose every frame. If [code]false[/code], the solver retrieves the bone axis from the bone rest and caches it, which increases performance slightly, but position changes in the bone pose made before processing this [IKModifier3D] are ignored.