The initial mass composer script for UAV NeoSIM is done and bug free! This project started off as a small personal project targeted at adding a feature to UAV NeoSIM (A drone simulation created on Unity) where users can import their own custom drone models and fly them around. A python mass-properties script was created that takes in the imported stl, mass density, and specific point masses for objects such as the motors, the battery, and the computers to calculate the inertial tensors. Out of this working mass composing script evolved the larger idea to make a python package with a more general version of a masscompose function. The idea is to help out game and sim devs everywhere by giving them an easy way to create their own rigidbody physics objects that need the additonal of additional masses. mass-properties (The initial module) took advantage of the trimesh module to calculate the COM and the original inertial tensor from here. The parallel axis theorem was added to calculate the changed COM and inertial tensors with the addition of the point masses. This “backend” of sorts had three parts, the most important being udp_listener which communicated back and forth with unity to recieve coordinates and masses and sent coordinates and masses. This backend serves as the logical backbone that this python package can be finished.