Greta

Welcome to the public repository of the Greta project.

Greta is a virtual character engine that allows generating realtime socio-emotional behaviors in order to build natural interactional scenario with human users.

It is the result of different research projects conducted by Catherine Pelachaud in her research group.

• Java modular software designed to run on Java 8 only and mainly on Windows, it is not ready for Java 9 yet.
• The "master" repository of Greta is licensed under the GNU GPL v3; so if you use this branch, your modification will also become GNU GPL v3.
• The "master-lgpl" of Greta is licensed under the GNU LGPL v3.
• Depends on external software for Speech Synthesis (MaryTTS or CereProc), and 3D Rendering (Ogre or Unity).

Directory structure

ATTENTION:

• Before checking each component here, STRONGLY RECOMMEND TO CHECK Quick start and try to run Greta first.
• Then, check the "For developers" section in the sidebar of this wiki
• After that, you can check each detailed functionality from the "Functionalities" section in the sidebar of this wiki

• application: directory for the Modular application, which connects all the modules in the Greta platform
• auxiliary: auxiliary modules
• bin: compiled JAR files and non-Java programs should be in this directory.
• core: core modules (if you are new, recommend starting from BehaviorPlanner and BehaviorRealizer using Netbeans IDE)
• doc: previously used but not maintained anymore
• pictures: pictures that are used in wiki pages. You cannot find all the images used in the wiki from here because some are embedded directly into the wiki page.
• tools: some tool modules. Please refer here for the included modules

Update

Jun 08, 2025: release of Greta 2.0

• Added LipBlander module and FaceBlender module
  • Greta can now run in parallel both the SAIBA-based process and the frame-by-frame generation process based on neural networks
• Added ASR (DeepGram) module
• Added LLM (Mistral) module
• Added VAP-based turn-management module
• Added VAD-based backchannel module
• Added facial expression generation based on MODIFF-8

Sep 03, 2024: changed license from LGPL to GPL, added many functionalities(EN, FR)!

• Greta (master branch) was changed from LGPL licensed to GPL licensed.
• Previous LGPL version Greta (master branch) is now in "master-lgpl" branch
• Added incremental behavior realizer module
• Added LLM module with Mistral, Mistral module for incremental processing
• Added DeepASR module, a deep learning based incremental ASR
• Added MeaningMiner module,
• Added NVBG module, a nonverbal behavior generator
• At this moment, we only support English and French languages

Installation and usage

For instructions on how to install/compile/use the project, please see WIKI