Over time different CAD vendors implemented plenty of different boundary representation engines (aka. While it would be great if standard meant not just a standard for mathematical principles, but a standard implementation, this could not be further away from the truth. By the '80s, boundary representation or b-rep became the industry standard mathematical model for 3D manufacturing applications. Typically, a geometry kernel has thousands of geometry operations implemented. Some examples of the operations that a geometry kernel can provide are boolean operations, extrusions, sweeps, lofts and many more. The geometry kernel is at the heart of every CAD system, and the quality of geometry primarily depends on the kernel that your CAD system is built on. This is created by a 3D geometry kernel, which is a software component, responsible for geometry calculations. In 3D Computer Aided Design systems, the most important building block is the 3D geometry. In this article, we'll give an overview of how CAD systems, geometry kernels and file formats work, provide ideas for best workflow practices, and highlight some common mistakes that can lead to manufacturing errors and data loss. Unfortunately, even for experienced CAD users it can be extremely challenging to navigate the world of CAD technology. Understanding how 3D CAD (Computer Aided Design) works internally is the foundation of error-proof, efficient workflows.
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