This is the old deprecated documentation for Mutable. Please visit for the latest release.


What is the status of Mutable?

Mutable is an unfinished system that we adapt to the needs of every project. We are hoping to release a public demo version at some point before the end of the year with a test project for anyone to be able to evaluate it. We don't see Mutable as a plug-and-play solution for character (or general content)-customisation yet, but a framework we adapt and optimise for each case.

Is mutable right for my project?

Many projects can get away with a system of interchangeable parts for their characters, and use some real time shader effects for colours. For those projects, Mutable is not necessary at all. Mutable aims more at solving the case for games like APB, Kingdom Under Fire 2 or PUBG, to put examples we know very well at Anticto, where deeper customisation is required, and performance is critical. If you contact us and tell us more about your project, we may be able to evaluate the suitability of Mutable better.

What is the licensing cost and how can i try it?

 We are trying to have a standalone version that we can release for people to be able to evaluate Mutable freely. It will not be really polished and optimised, but we are open to do that on demand. Regarding licensing fees, we are very flexible. We have an indie-like license piggy-backing on Epic's 5% for Unreal Engine, by adding an extra 1% on gross income for Mutable in exactly the same conditions Epic has. We also consider the one-time payment option, with a fee for the first platform, and an additional fees for every other platform. In both cases dedicated support needs to be paid monthly and separately. Bug-fixing and minimal non-time-critical support will be there in any case. If you don't like these options, we are open to suggestions.

Does Mutable include a character library we can use in our games?

No. Mutable is not a character library and you will still need artists to create assets for your game. Mutable will let you decide how this assets are combined into the final optimised game characters, and create parameters to customize them.

We use a non-standard material or rendering pipeline, can we use Mutable?

Yes. Mutable can handle any number and type of materials and textures. It doesn't have any hardcoded features for "colour", "normal", "metallic" or any material property.

Can Mutable adapt animations?

No. Mutable only builds meshes and textures for your static or skeletal objects, it doesn't modify animations.

Using Mutable

How do I set a physics asset for the characters generated by Mutable?

Right now, skeletal meshes created by Mutable don't contain any physics asset. We are not copying all the data from the reference mesh. We are evaluating the possibility to do this automatically at some point, but for now the physics setup of the meshes generated by mutable instances has to be done by the game code (using the "Physics Asset Override" property in the skeletal mesh component).

Can Mutable handle cloth animation?

There are several cloth animation systems in Unreal Engine, as far as we know:

  • nVidia Apex cloth: Mutable does not support it, and it will not support it. This is a method that we believe it is being phased out, and it uses opaque data in binary blobs that we cannot interact with.
  • Anim Dynamics: This is the method used by Epic in Paragon. It relies on bones to deform the meshes, so it is supported without any special requirement. See  for an overview of anim dynamics by Epic. This is the recommended method when using Mutable.
  • There is a new cloth system in Unreal Engine since 4.19. We don't have support for it yet, but we may evaluate it for the future.