Bitbybit OCCT Library Shapes

The OCCT shape hierarchy in Bitbybit, from vertices and edges up through wires, faces, shells, solids and compounds. Understanding this hierarchy is the thing that makes OCCT click: every operation expects a particular level, and most confusing errors come from handing a function the wrong one. These pages explain what each shape type is and how they nest, then work through each level in detail with its own primitives and construction methods. If you are new to boundary representation modelling, read the hierarchy overview first and the individual shape pages after.

📄️Intro Shapes

Explore the different types of shapes in OpenCascade Technology (OCCT) and understand their hierarchical relationship, from vertices to solids and compounds.

📄️Vertices

Vertices, OCCT's own points - making them from plain points, reading them back, bundling a point cloud into one shape to draw, and casting points onto a shape to find where they land - with an example in Rete, Blockly and TypeScript and a table of every function.

🗃Edge

4 items

🗃Wire

9 items

🗃Face

5 items

🗃Shells

1 item

🗃Solids

2 items

🗃Compound

2 items

📄️Any Shape

What every OCCT shape can tell you and have done to it - its type and orientation, whether it is closed or empty, whether two handles are the same shape, merging the seams a boolean leaves with unifySameDomain and removing the edges a split leaves inside a face - with an example in Rete, Blockly and TypeScript and a table of every function.

📄️Graph and Geometry

Looking inside an OpenCascade shape - the graph of solids, shells, faces, edges and vertices and how they connect, read with occt.brepGraph, and the curves and surfaces beneath them, built and read with occt.geom - with a table of every function.