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The Scriptable Animation System is a complex technology, which brings not just a single plugin, but a new way to organize, manage and extend the functionality of animation features in your game. Let’s start with a new KAnimationCore plugin, which adds a solid low-level library of animation functions and types.

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KAnimationMath

This class includes static functions to manipulate transforms in real time. It essentially replaces the CoreToolkitLib from the previous version. The only difference is that KAnimationMath is responsible for animation functions only.

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KCurves

Includes everything related to the curves in the framework. This includes new curve types and easing functions.

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KMath

A new library designed for general math operations.

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KSpringMath

This class implements runtime spring computation. You can use it if you wish to add a spring interpolation to your feature.

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KTransform

This is a struct that is identical to the Unity built-in Transform type. The only difference is that it is a struct, which means we can use it safely in Unity Jobs! This struct has all the methods to manipulate the transform:

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KPose

KPose defines how the selected element will be modified in real time. It is often used by Animator Layers, but you can also find it useful for other applications: Element defines the bone/element that will be modified, and Pose is a KTransform that represents the value. Space defines where our applications will be done. So far the system supports:
  • Bone space: the space of the element’s current frame.
  • Parent Bone space: the space of the parent bone.
  • Component space: the space of the character root bone.
  • World space: the global space, a standard world space.
Modify Mode defines how the Pose will be applied:
  • Add: the Pose will be added to the element.
  • Replace: the Pose will replace the element’s transform.

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KTwoBoneIK

This class implements a two-bone IK algorithm, which is Unity Jobs-friendly! The Solve function uses KTransform by default and also provides a KTwoBoneIkJob class to solve inverse kinematics for multiple limbs in ParallelFor. By default, this class is used in the IkLayerState class to apply inverse kinematics. As you can see, the new KAnimationUtilty is a way more streamlined, and most importantly independent from the main code-based, which makes it possible to use outside of the framework. In the next section, we will learn more about the KRig assets.