Morten Vajhøj developed and integrated mass properties calculation functionality into the FreeCAD/FreeCAD repository, enabling engineers to compute and display volume, mass, density, surface area, center of gravity, center of volume, and inertia for selected objects. He designed new inertia data structures and units in C++ and Python, and built a user interface within the Measure workbench using Qt. Morten also addressed a regression in the Part Workbench by refining sub-element handling and selection logic, improving calculation accuracy for complex assemblies. His work enhanced reliability and efficiency in geometry processing, reducing manual effort and supporting more informed design decisions.