IfcOpenShell/IfcOpenShell
Oct 2024 – Feb 2026
17 Months active
Languages Used
C++PythonBatchCMakeGitIFCPowerShellSWIG
Technical Skills
Boolean OperationsBuild ScriptingC++ DevelopmentComputational GeometryDocumentationError Handling
Thomas Krijnen
PROFILE
Thomas Krijnen
Tjerk Krijnen developed and maintained core geometry processing, serialization, and data validation features for the IfcOpenShell/IfcOpenShell repository, focusing on robust IFC model workflows. He engineered cross-platform build systems and automated CI pipelines using C++ and Python, integrating technologies like RocksDB and CGAL to support scalable storage and advanced geometric operations. His work included implementing streaming data access, enhancing schema validation, and optimizing performance for complex 3D modeling tasks. By refining error handling, memory management, and code quality, Tjerk improved reliability and maintainability, enabling faster iteration and broader adoption of the platform across diverse BIM and CAD environments.
Overall Statistics
Feature vs Bugs
60%Features
Repository Contributions
478Total
Bugs
129
Commits
478
Features
193
Lines of code
226,382
Activity Months17
Your Network
45 people
Work History
February 2026
6 Commits • 4 Features
Feb 1, 2026February 2026 (2026-02) monthly summary for IfcOpenShell/IfcOpenShell. Delivered robustness and geometry enhancements, improved IFC placement handling, and code quality/performance instrumentation. These work items increase reliability when processing non-manifold and curved geometries, reduce mapping errors in relationship-based placements, and provide measurable performance data to guide optimization. Business value: lowers rework risk in model processing, expands supported geometry workflows for customers, and improves maintainability and observability for ongoing optimization.
6 Commits • 4 Features
Feb 1, 2026February 2026 (2026-02) monthly summary for IfcOpenShell/IfcOpenShell. Delivered robustness and geometry enhancements, improved IFC placement handling, and code quality/performance instrumentation. These work items increase reliability when processing non-manifold and curved geometries, reduce mapping errors in relationship-based placements, and provide measurable performance data to guide optimization. Business value: lowers rework risk in model processing, expands supported geometry workflows for customers, and improves maintainability and observability for ongoing optimization.
February 2026
January 2026
10 Commits • 2 Features
Jan 1, 2026January 2026 monthly summary for IfcOpenShell/IfcOpenShell. Focus on robustness, build reliability, and developer experience. Key outcomes include robust geometry processing for triangulated elements, safer GMP builds via FAT, corrected BRep volume calculations, hardened handling of indeterminate IFC values, and a controlled parallel processing path for boolean operations.
January 2026
10 Commits • 2 Features
Jan 1, 2026January 2026 monthly summary for IfcOpenShell/IfcOpenShell. Focus on robustness, build reliability, and developer experience. Key outcomes include robust geometry processing for triangulated elements, safer GMP builds via FAT, corrected BRep volume calculations, hardened handling of indeterminate IFC values, and a controlled parallel processing path for boolean operations.
December 2025
4 Commits • 3 Features
Dec 1, 2025December 2025 monthly summary for IfcOpenShell/IfcOpenShell: Implemented three focused deliverables that improve data quality, stability, and developer productivity across IFC geometry handling, rule execution, and validation tests. The OBJ geometry pipeline enhancements tighten normals accounting for OBJ serialization and extend geometry support with IfcOpenCrossProfileDef mapping, reducing export inconsistencies. The express rule engine attribute retrieval improvements introduce express_getattr to robustly fetch attributes, map None to Indeterminate to prevent failures in non-short-circuiting rule execution, and ensure consistent code generation. The IFC property list validation tests expand test coverage to verify handling of distinct value types and nil values, improving data integrity. These changes reduce runtime errors, improve export reliability, and provide stronger validation for downstream consumers.
4 Commits • 3 Features
Dec 1, 2025December 2025 monthly summary for IfcOpenShell/IfcOpenShell: Implemented three focused deliverables that improve data quality, stability, and developer productivity across IFC geometry handling, rule execution, and validation tests. The OBJ geometry pipeline enhancements tighten normals accounting for OBJ serialization and extend geometry support with IfcOpenCrossProfileDef mapping, reducing export inconsistencies. The express rule engine attribute retrieval improvements introduce express_getattr to robustly fetch attributes, map None to Indeterminate to prevent failures in non-short-circuiting rule execution, and ensure consistent code generation. The IFC property list validation tests expand test coverage to verify handling of distinct value types and nil values, improving data integrity. These changes reduce runtime errors, improve export reliability, and provide stronger validation for downstream consumers.
December 2025
November 2025
29 Commits • 12 Features
Nov 1, 2025Monthly work summary for 2025-11: Focused on platform readiness, code quality, and feature enhancements for IfcOpenShell/IfcOpenShell. Delivered key features that improve build reliability, cross-architecture support, and data export fidelity, while addressing stability and parsing robustness. Notable outcomes include upstream-aligned submodules, streamlined CGAL/GMPXX build integration, ARM64 CI/Makefile support, established code quality tooling (ruff/black), and enhanced GLB export with element hierarchy support and a separate-z-up-node option. These efforts reduce maintenance overhead, accelerate integration with downstream pipelines, and extend deployment capabilities across environments.
November 2025
29 Commits • 12 Features
Nov 1, 2025Monthly work summary for 2025-11: Focused on platform readiness, code quality, and feature enhancements for IfcOpenShell/IfcOpenShell. Delivered key features that improve build reliability, cross-architecture support, and data export fidelity, while addressing stability and parsing robustness. Notable outcomes include upstream-aligned submodules, streamlined CGAL/GMPXX build integration, ARM64 CI/Makefile support, established code quality tooling (ruff/black), and enhanced GLB export with element hierarchy support and a separate-z-up-node option. These efforts reduce maintenance overhead, accelerate integration with downstream pipelines, and extend deployment capabilities across environments.
October 2025
44 Commits • 21 Features
Oct 1, 2025October 2025 was a value-driven month for IfcOpenShell/IfcOpenShell, delivering essential data interchange capabilities, stability improvements, and developer experience enhancements. The team advanced IFCXML writing, expanded visualization options, and strengthened memory safety and code quality, enabling faster, more reliable model workflows for customers and internal teams. Highlights include targeted bug fixes that prevent data loss and runtime crashes, plus performance-oriented refinements that reduce startup overhead and smoothing Unicode/build processes across platforms.
44 Commits • 21 Features
Oct 1, 2025October 2025 was a value-driven month for IfcOpenShell/IfcOpenShell, delivering essential data interchange capabilities, stability improvements, and developer experience enhancements. The team advanced IFCXML writing, expanded visualization options, and strengthened memory safety and code quality, enabling faster, more reliable model workflows for customers and internal teams. Highlights include targeted bug fixes that prevent data loss and runtime crashes, plus performance-oriented refinements that reduce startup overhead and smoothing Unicode/build processes across platforms.
October 2025
September 2025
66 Commits • 26 Features
Sep 1, 2025September 2025 monthly summary for IfcOpenShell/IfcOpenShell focused on strengthening test coverage, stabilizing and enhancing RocksDB-backed storage, advancing serialization, expanding Python API access, and improving build, performance, and code quality to deliver tangible business value and long-term maintainability.
September 2025
66 Commits • 26 Features
Sep 1, 2025September 2025 monthly summary for IfcOpenShell/IfcOpenShell focused on strengthening test coverage, stabilizing and enhancing RocksDB-backed storage, advancing serialization, expanding Python API access, and improving build, performance, and code quality to deliver tangible business value and long-term maintainability.
August 2025
74 Commits • 25 Features
Aug 1, 2025August 2025 monthly summary for IfcOpenShell (IfcOpenShell/IfcOpenShell). This period delivered core CLI usability improvements, data fidelity enhancements, and streaming capabilities, underpinned by performance and quality improvements that support robust CI and cross‑platform builds. Notable outcomes include improvements to the Standalone Drawer workflow, CGAL-based geometry processing, RocksDB/Python streaming integration, and serialization/deserialization/rdb handling, all aligned with enterprise automation and interoperability goals.
74 Commits • 25 Features
Aug 1, 2025August 2025 monthly summary for IfcOpenShell (IfcOpenShell/IfcOpenShell). This period delivered core CLI usability improvements, data fidelity enhancements, and streaming capabilities, underpinned by performance and quality improvements that support robust CI and cross‑platform builds. Notable outcomes include improvements to the Standalone Drawer workflow, CGAL-based geometry processing, RocksDB/Python streaming integration, and serialization/deserialization/rdb handling, all aligned with enterprise automation and interoperability goals.
August 2025
July 2025
10 Commits • 5 Features
Jul 1, 2025July 2025 monthly summary for IfcOpenShell/IfcOpenShell: Delivered core feature enhancements for geometry processing and styling, updated dependencies, and expanded platform compatibility for Rocky 8 and Python 3.6. While no explicit critical bugs were reported, the month delivered substantial quality, maintainability, and business value through robust IFC processing and broader platform support.
July 2025
10 Commits • 5 Features
Jul 1, 2025July 2025 monthly summary for IfcOpenShell/IfcOpenShell: Delivered core feature enhancements for geometry processing and styling, updated dependencies, and expanded platform compatibility for Rocky 8 and Python 3.6. While no explicit critical bugs were reported, the month delivered substantial quality, maintainability, and business value through robust IFC processing and broader platform support.
June 2025
31 Commits • 16 Features
Jun 1, 2025June 2025 monthly summary for IfcOpenShell/IfcOpenShell: Delivered a set of robust features, stability improvements, and cross-platform infrastructure work. Improved data fidelity in rendering and GIS data handling, enhanced cross-platform CI and packaging, and upgraded dependencies and code quality to accelerate development velocity and business value.
31 Commits • 16 Features
Jun 1, 2025June 2025 monthly summary for IfcOpenShell/IfcOpenShell: Delivered a set of robust features, stability improvements, and cross-platform infrastructure work. Improved data fidelity in rendering and GIS data handling, enhanced cross-platform CI and packaging, and upgraded dependencies and code quality to accelerate development velocity and business value.
June 2025
May 2025
8 Commits • 3 Features
May 1, 2025May 2025: Key validation, performance, and compatibility improvements for IfcOpenShell. Delivered robust IFC schema validation with expanded test fixtures, enhancing data accuracy and reliability. Implemented performance and memory optimizations for geometry processing via shape caching, consolidated transformations, and streamlined triangulation. Fixed critical issues including default scale propagation in Cartesian Transformation Operator 3D and correct handling of UsingCurves in composite curves, improving schema compliance and runtime stability. Completed maintenance and compatibility enhancements, including Python type hints, conditional compilation directives, and updated submodule references, simplifying future maintenance and schema adaptations. Result: reduced data errors, faster processing, and stronger readiness for upcoming IFC schema versions.
May 2025
8 Commits • 3 Features
May 1, 2025May 2025: Key validation, performance, and compatibility improvements for IfcOpenShell. Delivered robust IFC schema validation with expanded test fixtures, enhancing data accuracy and reliability. Implemented performance and memory optimizations for geometry processing via shape caching, consolidated transformations, and streamlined triangulation. Fixed critical issues including default scale propagation in Cartesian Transformation Operator 3D and correct handling of UsingCurves in composite curves, improving schema compliance and runtime stability. Completed maintenance and compatibility enhancements, including Python type hints, conditional compilation directives, and updated submodule references, simplifying future maintenance and schema adaptations. Result: reduced data errors, faster processing, and stronger readiness for upcoming IFC schema versions.
April 2025
23 Commits • 3 Features
Apr 1, 2025April 2025 monthly summary for IfcOpenShell/IfcOpenShell. The month focused on delivering automation improvements, expanding data model support, and hardening core rendering and data processing pipelines to boost reliability and user value.
23 Commits • 3 Features
Apr 1, 2025April 2025 monthly summary for IfcOpenShell/IfcOpenShell. The month focused on delivering automation improvements, expanding data model support, and hardening core rendering and data processing pipelines to boost reliability and user value.
April 2025
March 2025
33 Commits • 14 Features
Mar 1, 2025March 2025 milestone: Delivered core feature and stability improvements for IfcOpenShell. Key features include a RocksDB-based non-streaming serializer with has() support, auto-detect filetype, and Python binding enhancements (guess_format and readable setting type retrieval), along with model transformation improvements (normalized rotation quaternion and reinstated model-offset/rotation parsing). Packaging and cross-language bindings were strengthened with ColladaSerializer exposure and guess_from_extension support in Python bindings, plus wheels and Pyodide demo workflow updates. Several targeted bug fixes (Python binding stability, control flow cleanups, circle handling in upgrades, and memory-safety improvements via unique_ptrs) reduced regressions and improved reliability. Overall, these changes accelerate safe data exploration, improve ingestion and transformation performance, and enhance the developer experience across Python, C++, and deployment pipelines.
March 2025
33 Commits • 14 Features
Mar 1, 2025March 2025 milestone: Delivered core feature and stability improvements for IfcOpenShell. Key features include a RocksDB-based non-streaming serializer with has() support, auto-detect filetype, and Python binding enhancements (guess_format and readable setting type retrieval), along with model transformation improvements (normalized rotation quaternion and reinstated model-offset/rotation parsing). Packaging and cross-language bindings were strengthened with ColladaSerializer exposure and guess_from_extension support in Python bindings, plus wheels and Pyodide demo workflow updates. Several targeted bug fixes (Python binding stability, control flow cleanups, circle handling in upgrades, and memory-safety improvements via unique_ptrs) reduced regressions and improved reliability. Overall, these changes accelerate safe data exploration, improve ingestion and transformation performance, and enhance the developer experience across Python, C++, and deployment pipelines.
February 2025
32 Commits • 19 Features
Feb 1, 2025February 2025 performance summary for IfcOpenShell/IfcOpenShell. Focused on repository maintenance, build reliability, and codegen/build-system enhancements to improve developer velocity and platform readiness. Delivered targeted features and stability improvements across Linux, Windows, and macOS build workflows, while documenting platform deprecations and advancing data handling capabilities.
32 Commits • 19 Features
Feb 1, 2025February 2025 performance summary for IfcOpenShell/IfcOpenShell. Focused on repository maintenance, build reliability, and codegen/build-system enhancements to improve developer velocity and platform readiness. Delivered targeted features and stability improvements across Linux, Windows, and macOS build workflows, while documenting platform deprecations and advancing data handling capabilities.
February 2025
January 2025
25 Commits • 13 Features
Jan 1, 2025Month 2025-01: Concise monthly summary for IfcOpenShell/IfcOpenShell focusing on delivering business value through feature delivery, reliability improvements, and scalable demo/integration pipelines. The work emphasizes extensibility, testing visibility, and pipeline robustness, enabling faster iteration and broader adoption.
January 2025
25 Commits • 13 Features
Jan 1, 2025Month 2025-01: Concise monthly summary for IfcOpenShell/IfcOpenShell focusing on delivering business value through feature delivery, reliability improvements, and scalable demo/integration pipelines. The work emphasizes extensibility, testing visibility, and pipeline robustness, enabling faster iteration and broader adoption.
December 2024
39 Commits • 14 Features
Dec 1, 2024December 2024 performance summary for IfcOpenShell/IfcOpenShell focused on delivering robust geometry processing, data fidelity, and build/CI improvements that drive reliability and interoperability. Key features include SVG-based storey decomposition and space arrangement enhancements, cross-system unit propagation with higher WKT precision, and reliability improvements in XmlSerializer and self-intersection handling. Interoperability was boosted by exporting GLTF material names, while build and dependency hygiene was tightened via Nix fetch optimizations, submodule synchronization, WASM/Pyodide integration, and CI improvements. These efforts collectively reduce risk in production pipelines, improve data fidelity for downstream tooling, and accelerate future feature delivery.
39 Commits • 14 Features
Dec 1, 2024December 2024 performance summary for IfcOpenShell/IfcOpenShell focused on delivering robust geometry processing, data fidelity, and build/CI improvements that drive reliability and interoperability. Key features include SVG-based storey decomposition and space arrangement enhancements, cross-system unit propagation with higher WKT precision, and reliability improvements in XmlSerializer and self-intersection handling. Interoperability was boosted by exporting GLTF material names, while build and dependency hygiene was tightened via Nix fetch optimizations, submodule synchronization, WASM/Pyodide integration, and CI improvements. These efforts collectively reduce risk in production pipelines, improve data fidelity for downstream tooling, and accelerate future feature delivery.
December 2024
November 2024
37 Commits • 10 Features
Nov 1, 2024November 2024 (2024-11) monthly summary for IfcOpenShell/IfcOpenShell: Delivered a cohesive set of features, stability fixes, and build/CI improvements across the repository, with a clear focus on business value and technical robustness. Highlights include wiring the SVG fill arrange_polygons API, strengthening parsing/validation, and enhancing CI/CD and submodule/dependency maintenance to support faster, cross-platform integrations and developer onboarding.
November 2024
37 Commits • 10 Features
Nov 1, 2024November 2024 (2024-11) monthly summary for IfcOpenShell/IfcOpenShell: Delivered a cohesive set of features, stability fixes, and build/CI improvements across the repository, with a clear focus on business value and technical robustness. Highlights include wiring the SVG fill arrange_polygons API, strengthening parsing/validation, and enhancing CI/CD and submodule/dependency maintenance to support faster, cross-platform integrations and developer onboarding.
October 2024
7 Commits • 3 Features
Oct 1, 2024October 2024 monthly summary for IfcOpenShell/IfcOpenShell focusing on delivering robust geometry processing and serialization, modernizing the build system, and strengthening type handling to increase reliability and cross-platform maintainability.
7 Commits • 3 Features
Oct 1, 2024October 2024 monthly summary for IfcOpenShell/IfcOpenShell focusing on delivering robust geometry processing and serialization, modernizing the build system, and strengthening type handling to increase reliability and cross-platform maintainability.
October 2024
Activity
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Quality Metrics
Correctness87.6%
Maintainability88.4%
Architecture85.0%
Performance79.8%
AI Usage20.2%
Skills & Technologies
Programming Languages
BashBatchC++CMakeCSSCmakeExpressGitHTMLIFC
Technical Skills
3D Graphics3D Graphics Programming3D Model Formats3D modelingAPI DesignAPI DevelopmentAPI IntegrationAPI UpdatesAPI designAWS CLIAWS S3Algorithm DesignAlgorithm OptimizationAutomationB-Rep Modeling
Repositories Contributed To
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