Motion Matching & Code vs Data Driven Displacement

This repo contains the source code for all the demos from this article.

It also contains basic example implementations of Motion Matching and Learned Motion Matching in the style of this paper.

Installation

This demo uses raylib and raygui so you will need to first install those. Once installed, the demo itself is a pretty straight forward to make - just compile controller.cpp.

I've included a basic Makefile which you can use if you are using raylib on Windows. You may need to edit the paths in the Makefile but assuming default installation locations you can just run Make.

If you are on Linux or another platform you will probably have to hack this Makefile a bit.

Web Demo

If you want to compile the web demo you will need to first install emscripten. Then you should be able to (on Windows) run emsdk_env followed by make PLATFORM=PLATFORM_WEB. You then need to run wasm-server.py, and from there will be able to access localhost:8080/controller.html in your web browser which should contain the demo.

Learned Motion Matching

Most of the code and logic you can find in controller.cpp, with the Motion Matching search itself in database.h. The structure of the code is very similar to the previously mentioned paper but not identical in all respects. For example, it does not contain some of the briefly mentioned optimizations to the animation database storage and there are no tags used to disambiguate walking and running.

If you want to re-train the networks you need to look in the resources folder. First you will need to run train_decompressor.py. This will use database.bin and features.bin to produce decompressor.bin, which represents the trained decompressor network, and latent.bin, which represents the additional features learned for each frame in the database. It will dump also out some images and .bvh files you can use to examine the progress (as well a write Tensorboard logs to the resources/runs directory). Once the decompressor is trained and you have a well trained network and corresponding latent.bin, you can then train the stepper and the projector (at the same time) using train_stepper.py and train_projector.py. Both of these will also output networks (stepper.bin and projector.bin) as well as some images you can use to get a rough sense of the progress and accuracy.

The data required if you want to regenerate the animation database is from this dataset which is licensed under Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Public License (unlike the code, which is licensed under MIT).

If you re-generate the database you will also need to re-generate the matching database features.bin, which is done every time you re-run the demo. Similarly if you change the weights or any other properties that affect the matching the database will need to be re-generated and the networks re-trained.