An EGG file is a 3D model created with Panda3D. It defines all the model's transforms and vertices using global coordinates.

Panda3D is a 3D engine that includes a library of subroutines for rendering 3D animations and creating 3D games. It was developed by Disney and is maintained by Carnegie Mellon at the Entertainment Technology Center. Most games that use the Panda3D engine are written in C++ or Python.