The world's leading open-source geometric modeling kernel for 3D engineering software.
Open Cascade Technology (OCCT) is an industrial-grade C++ software development kit designed for the creation of 3D Computer-Aided Design (CAD), Manufacturing (CAM), and Engineering (CAE) applications. As of 2026, it remains the most robust open-source alternative to proprietary kernels like Parasolid or ACIS. Its architecture is built around a powerful Boundary Representation (B-Rep) modeling kernel that enables precise geometry definition, Boolean operations, and shape healing. The 2026 market position of Open Cascade has pivoted towards 'Hybrid Modeling,' integrating traditional B-Rep with neural mesh processing to support AI-driven generative design workflows. OCCT provides comprehensive modules for data exchange (STEP, IGES), visualization (OpenGL and Ray-tracing), and mesh management. The platform is managed by Open Cascade SAS (a Capgemini company), ensuring enterprise-grade stability and a continuous release cycle that addresses modern GPU acceleration (Vulkan/DirectX 12) and cloud-based 3D visualization requirements. Its modular nature allows developers to strip down the kernel for lightweight web-based viewers or scale up for high-performance physics simulations, making it the foundational infrastructure for billions of dollars in industrial software assets.
Precise topological and geometric modeling using NURBS, analytical surfaces, and complex edge connectivity.
Verified feedback from the global deployment network.
Post queries, share implementation strategies, and help other users.
Automated algorithms to fix gaps, reversed faces, and non-manifold geometry in imported CAD files.
Advanced Boolean algorithms that handle geometry with low precision or tolerance overlaps.
Framework for handling structured CAD data including colors, layers, names, and metadata.
High-performance visualization engine supporting real-time shadows, materials, and large assembly rendering.
Support for TBB (Threading Building Blocks) to parallelize heavy geometric computations.
Robust triangulation algorithms for converting B-Rep surfaces into high-quality meshes for FEM/CFD.
Manual toolpath creation is slow; requires programmatic geometry analysis.
Registry Updated:2/7/2026
Export to G-Code.
Heavy desktop CAD files won't load in browsers.
Data silos in legacy CAD software (CATIA/SolidWorks).