OCCT 8.0 will introduce BRepGraph - a new way to work with B-Rep topology. Instead of traversing shape trees with TopExp_Explorer and building indexed maps for every adjacency query, BRepGraph stores topology as flat entity vectors with O(1) reverse indices. Edge-to-face, vertex-to-edge, wire-to-face - all direct lookups.

Full details and discussion: https://github.com/Open-Cascade-SAS/OCCT/discussions/1170

Open Cascade is delighted to announce the release of Open CASCADE Technology version 8.0.0 Release Candidate 4 to the public.

Dear OCCT Community and Partners,

We are writing to inform you of upcoming changes to the infrastructure. As part of our commitment to modernizing our development workflow, we are transitioning our legacy systems to more sustainable platforms.

Release Date: December 2025 Full Release Notes: GitHub Discussion #917

Highlights

Version 8.0.0-rc3 includes 157 improvements over RC2, totaling 290+ changes since 7.9.0.

Open CASCADE Technology 7.9.3 Released

Open Cascade is delighted to announce the release of Open CASCADE Technology version 7.9.3 to the public.

Overview

Version 7.9.3 is a maintenance release incorporating over 15 improvements and bug fixes compared to version 7.9.2.

A look behind the scenes at the technical shifts shaping the next major release:

• Modern C++: Shifting to C++17, native types (double, int), and standard STL.
• Refactoring: Introduction of the occ:: namespace and std::optional for cleaner architecture.
• Performance: Removing deprecated math wrappers in favor of standard library implementations.
• Announcements: First details on Light OCCT and upcoming Data Exchange formats (ODE/XDE).

Dive into the full technical details in the article below.

https://github.com/Open-Cascade-SAS/OCCT/discussions/846

Best regards, OCCT Dev Team.

Open Cascade is delighted to announce the release of Open CASCADE Technology version 7.9.2 to the public.

Overview

Version 7.9.2 is a maintenance release incorporating over 25 improvements and bug fixes compared to version 7.9.1.

We are excited to announce a significant new release for our commercial C# Wrapper for OCCT3D, packed with improvements designed to streamline your .NET development process and enhance your application’s capabilities. This update focuses on stability, increased coverage, and, most importantly, a simplified integration workflow.

Here’s a look at what’s new:

We've enhanced OCCT3D's Advanced Data Exchange capabilities with import and export support for two critical formats: STEPXML and USD.

Explore the complete list of our 25+ supported data exchange formats: Data Exchange Formats - OCCT3D

Open Cascade is delighted to announce the release of Open CASCADE Technology version 8.0.0 Release Candidate 2 to the public.

(Release Candidate 1: https://github.com/Open-Cascade-SAS/OCCT/discussions/499)

Overview

Version V8_0_0_rc2 is a candidate release incorporating over 80 improvements and bug fixes compared to version V8_0_0_rc1, bringing the total improvements since version 7.9.0 to over 130 changes.

Open CASCADE Technology 7.9.1 Released

Open Cascade is delighted to announce the release of Open CASCADE Technology version 7.9.1 to the public.

Overview

Version 7.9.1 is a maintenance release incorporating over 30 improvements and bug fixes compared to version 7.9.0.

Download & Installation

You can obtain OCCT 7.9.1 in several ways:

Open Cascade is delighted to announce the release of Open CASCADE Technology version 8.0.0 Release Candidate 1 to the public.

Overview

Version V8_0_0_rc1 is a candidate release incorporating over 50 improvements and bug fixes compared to version 7.9.0.