How the Geometry Layer Powers Precision in 3D CAD Applications

A 3D CAD application is built from multiple layers, with the geometry layer serving as the core engine responsible for representing precise shapes and performing modeling calculations. At its foundation, the geometry layer handles mathematical entities such as points, curves, and surfaces, supported by a geometric kernel. Beyond raw geometry, CAD systems rely on Boundary Representation (B-Rep) to capture how geometric elements connect, defining topology through vertices, edges, faces, and bodies. When users create engineering features like holes, the application layer stores design intent while the geometry layer translates that intent into solid modeling operations such as Boolean subtractions. A key architectural challenge is that topology can change with edits, requiring applications to manage persistent references to model entities across reconstructions.