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Murad Yakushev
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How to Use Final IK for Procedural Animation and Rigging in Unity

Download Final IK: The Ultimate Inverse Kinematics Solution for Unity

If you are looking for a powerful and versatile inverse kinematics (IK) solution for your Unity project, you should definitely check out Final IK. Final IK is a collection of over 15 different types of IK solvers and solutions that can help you create realistic and immersive animations and interactions for your characters, robots, vehicles, and more. In this article, we will explain what inverse kinematics is, what Final IK can do, how to download it from the Unity Asset Store, and how to use it in your Unity project.

What is Inverse Kinematics and Why is it Important?

Inverse kinematics is the mathematical process of calculating the joint parameters needed to place the end of a kinematic chain, such as a robot arm or a character's skeleton, in a given position and orientation relative to the start of the chain. For example, if you want your character to reach for an object, you need to find out what angles each joint in their arm should have to make their hand touch the object. This is inverse kinematics. The opposite process, where you calculate the position and orientation of the end-effector given the joint parameters, is called forward kinematics.

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Inverse kinematics is important because it allows you to create realistic and natural movements for your characters and robots without having to manually animate each joint. It also enables you to create dynamic and interactive animations that respond to changes in the environment or user input. For example, you can use inverse kinematics to make your character look at or follow a moving target, adjust their posture according to terrain, or interact with other objects or characters.

What is Final IK and What are its Features?

Final IK is a leading inverse kinematics library for Unity that contains a wide variety of IK solvers and solutions. It is designed to be flexible, powerful, fast, lightweight, and easy to use. Here are some of the main features of Final IK:

Full Body Biped IK

Final IK includes an extremely flexible and powerful full body IK solver that can be used for real-time procedural animation modification and an unimaginable variety of animation effects. You can use it to modify existing animations or create new ones on the fly. For example, you can use it to make your character lean towards a direction, balance on uneven surfaces, reach for objects with any limb, or react to physical forces.


Final IK also includes a full body IK solver dedicated to virtual reality avatars. It supports up to six tracked points for head, hands, feet, and body, plus elbow and knee bend goals and built-in locomotion and foot placement. You can use it to create immersive and realistic VR experiences for your users, where they can see and control their own body in the virtual world.


Final IK includes a grounder system that can automatically adjust the legs and feet of your character to match the ground level and normal. It works with any character, regardless of the number of legs or the shape of the feet. You can use it to make your character walk on uneven terrain, stairs, slopes, or any other surface without sliding or floating.

Interaction System

Final IK includes an interaction system that can create procedural in-game interactions between your character and other objects or characters. It uses raycasting, triggers, events, and IK solvers to make your character reach for, touch, pick up, throw, or use any object in the scene. You can use it to add interactivity and realism to your game, where your character can manipulate the environment or interact with other characters.

Aim IK

Final IK includes an aim IK solver that can make any character or object point or aim at a target. It is very simple to set up and use, and it works with any number of bones and any rotation limits. You can use it to create aiming systems for weapons, cameras, lasers, or anything else that needs to point at something.

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Rotation Limits

Final IK includes a set of rotation limit components that can be used to create constrained rigs for your characters or objects. They can limit the rotation of any joint in any direction, using various types of constraints such as angle, hinge, polygonal, or spherical. You can use them to prevent unnatural or unwanted rotations, such as twisting or bending too much.

The Algorithms

Final IK uses different types of IK algorithms for different purposes and situations. Some of the algorithms are:

  • FABRIK: A simple and fast algorithm that can solve any type of chain with any number of constraints.

  • CCD: A classic algorithm that can solve simple chains quickly and reliably.

  • Limb IK: A specialized solver for limbs that can handle bending direction and joint limits.

  • Look-At IK: A solver that can make any number of bones look at a target.

  • Biped IK: A solver that can handle biped characters with spine, head, arms, and legs.

You can choose the best algorithm for your needs and customize it with various parameters and options.

How to Download Final IK from the Unity Asset Store?

Downloading Final IK from the Unity Asset Store is very easy and straightforward. Here are the steps you need to follow:

  • Open the Unity Editor and go to Window > Asset Store.

  • In the search bar, type "Final IK" and press Enter.

  • Find the Final IK asset by RootMotion and click on it.

  • On the asset page, click on the Add to Cart button and then on the Checkout button.

  • Review your order and click on the Buy button. You may need to log in with your Unity account and enter your payment details if you haven't done so before.

  • After the purchase is complete, click on the Download button and wait for the download to finish.

  • Click on the Import button and select all the files you want to import into your project. Click on Import again and wait for the import to finish.

Congratulations! You have successfully downloaded Final IK from the Unity Asset Store!

How to Use Final IK in Your Unity Project?

Using Final IK in your Unity project is very easy and fun. Here are some general tips and tricks for getting started:

  • To add an IK component to your character or object, select it in the Hierarchy window and go to Component > Final IK. Then choose the type of solver you want to use from the list.

  • To adjust the settings of an IK component, select it in the Inspector window and tweak the parameters as you like. You can also use the Scene view handles to manipulate the bones or targets visually.

  • To test your IK setup, press Play and see how it works in real time. You can also use scripts or animations to control the targets or other variables dynamically.

  • To learn more about how each solver works and what it can do, check out the documentation and the demo scenes included in the asset package. You can also watch some tutorial videos on YouTube or visit the official forum for support and feedback.

You are now ready to use Final IK in your Unity project and create amazing animations and interactions for your characters and objects.


Final IK is the ultimate inverse kinematics solution for Unity that can help you create realistic and immersive animations and interactions for your characters, robots, vehicles, and more. It contains a wide variety of IK solvers and solutions that are flexible, powerful, fast, lightweight, and easy to use. You can download it from the Unity Asset Store and use it in your Unity project with minimal setup and configuration. Whether you are making a game, a simulation, a VR experience, or anything else that involves animation and interaction, Final IK can make your life easier and your project better.

So what are you waiting for? Download Final IK today and unleash your creativity!


Here are some of the frequently asked questions and their answers about Final IK:

How much does Final IK cost?

  • Final IK costs $90 on the Unity Asset Store. However, it is often on sale or part of a bundle, so you may be able to get it for a lower price.

What are the system requirements for Final IK?

  • Final IK works with any version of Unity from 5.0 to 2020.3 or higher. It supports all platforms that Unity supports, including Windows, Mac, Linux, iOS, Android, WebGL, VR, AR, and more. It does not require any additional plugins or libraries.

Is Final IK compatible with other assets or tools?

  • Final IK is compatible with most of the popular assets and tools on the Unity Asset Store, such as UMA, PuppetMaster, Opsive Character Controllers, Cinemachine, PlayMaker, Bolt, Behavior Designer, and more. It also integrates well with Unity's native systems such as Animator, Mecanim, NavMesh, Physics, Timeline, and more.

Can I use Final IK for commercial projects?

  • Yes, you can use Final IK for any kind of project, whether it is personal or commercial. You only need to buy one license per seat (developer) and you can use it for unlimited projects.

Where can I get support or feedback for Final IK?

  • You can get support or feedback for Final IK by visiting the official forum thread on the Unity Forum. You can also contact the developer by email at


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