Edges

Edges are the curves that bound faces and chain together into wires in OCCT. Working with them directly is how you get precise control over a model: selecting the exact edges to fillet, measuring along a curve, dividing one into evenly spaced points, or building a wire from edges you constructed individually. These pages cover the edge primitives - lines, arcs, circles and ellipses - and constructing edges from constraints. They also cover edge indexing, which is the practical key to fillets and chamfers, along with a way to visualise those indices so you can pick the right ones.

📄️Intro Edges

Learn about OCCT edges, how to create linear and curved edges, analyze their properties, use them to construct wires, and deconstruct other shapes into edges in Bitbybit.

📄️Edge Indexing

Learn how to use and visualize edge indexes in OCCT for operations like filleting or chamfering specific edges, and how to adjust their display in Bitbybit.

📄️Edge Primitives

Master the fundamentals of edge creation in OCCT - from simple lines and circles to complex arcs and ellipses. Learn multiple methods to create precise geometric boundaries for your 3D models.

📄️Edge Constraints

Build OCCT edges that touch other curves - lines tangent to two circles or to a circle and a point, circles of a given radius tangent to two shapes, circles tangent to three, and lines tangent at an angle - in the plane of a frame, with an example in Rete, Blockly and TypeScript.