gismo/gismo
Oct 2024 – Jul 2025
6 Months active
Languages Used
C++CMakeXML
Technical Skills
C++C++ DevelopmentComputational GeometryGeometry ProcessingNumerical AnalysisSoftware Development
Christos Karampatzakis
PROFILE
Christos Karampatzakis
Chris Karampatzakis contributed to the gismo/gismo repository by developing and refining advanced spline and geometry processing features over six months. He engineered robust global index mapping and enhanced Bezier and NURBS extraction, enabling accurate visualization and efficient multi-patch assembly. Using C++ and XML, Chris improved XML I/O for rational THBSplines, extended APIs for better usability, and optimized performance in sparsity pattern computations. He addressed edge-case correctness in core numerical routines, expanded unit test coverage, and clarified documentation. His work demonstrated depth in computational geometry, numerical analysis, and software engineering, resulting in more reliable, maintainable, and scalable geometric modeling workflows.
Overall Statistics
Feature vs Bugs
67%Features
Repository Contributions
28Total
Bugs
6
Commits
28
Features
12
Lines of code
1,815
Activity Months6
Your Network
19 peopleShared Repositories
19
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Work History
July 2025
3 Commits
Jul 1, 2025Monthly summary for 2025-07 focused on correctness and reliability improvements in the gismo/gismo repository. Key activities targeted edge-case correctness in core numerical routines, with a significant emphasis on test coverage and documentation to reduce downstream risk and improve maintainability.
3 Commits
Jul 1, 2025Monthly summary for 2025-07 focused on correctness and reliability improvements in the gismo/gismo repository. Key activities targeted edge-case correctness in core numerical routines, with a significant emphasis on test coverage and documentation to reduce downstream risk and improve maintainability.
July 2025
June 2025
10 Commits • 5 Features
Jun 1, 2025June 2025 monthly summary for gismo/gismo. Focused on expanding high-dimensional spline support, improving persistence and API usability, and tightening numerical correctness to enhance reliability for downstream engineering workflows and applications that depend on robust rational THBSplines.
June 2025
10 Commits • 5 Features
Jun 1, 2025June 2025 monthly summary for gismo/gismo. Focused on expanding high-dimensional spline support, improving persistence and API usability, and tightening numerical correctness to enhance reliability for downstream engineering workflows and applications that depend on robust rational THBSplines.
March 2025
2 Commits • 2 Features
Mar 1, 2025Month: 2025-03 Summary: Delivered two targeted improvements in gismo/gismo that enhance robustness and performance for geometric domain handling and sparse computation paths, with a clear impact on larger-scale simulations and developer experience. Key deliverables: - Geometric Domain Handling Improvements: Fixed boundary iterator handling in the interface assembly (_computePatternIfc) and introduced a new gsMultiPatch.domain() API to construct a gsCompositeDomain from a gsMultiPatch, significantly improving robustness and functionality. - Sparsity Pattern Computation Optimization: Added a pre-check to skip sparsity pattern computation when input expressions are vectors, applied to _computePattern, _computePatternBdr, and _computePatternIfc to avoid unnecessary work and boost performance. Impact and accomplishments: - Improved robustness of geometric domain operations and extended API surface for domain construction, enabling more reliable workflows in complex geometries. - Reduced unnecessary computation in common paths, yielding faster assembly and pattern computations, particularly for large-scale problems. - Clear code-level improvements with targeted commits, facilitating maintainability and future optimizations. Technologies/skills demonstrated: - C++ API design and interface stabilization for geometry handling - Performance optimization through pre-checks and path pruning - API extension with gsMultiPatch.domain() and gsCompositeDomain construction - Code tracing and impact assessment of commits on core geometry workflows
2 Commits • 2 Features
Mar 1, 2025Month: 2025-03 Summary: Delivered two targeted improvements in gismo/gismo that enhance robustness and performance for geometric domain handling and sparse computation paths, with a clear impact on larger-scale simulations and developer experience. Key deliverables: - Geometric Domain Handling Improvements: Fixed boundary iterator handling in the interface assembly (_computePatternIfc) and introduced a new gsMultiPatch.domain() API to construct a gsCompositeDomain from a gsMultiPatch, significantly improving robustness and functionality. - Sparsity Pattern Computation Optimization: Added a pre-check to skip sparsity pattern computation when input expressions are vectors, applied to _computePattern, _computePatternBdr, and _computePatternIfc to avoid unnecessary work and boost performance. Impact and accomplishments: - Improved robustness of geometric domain operations and extended API surface for domain construction, enabling more reliable workflows in complex geometries. - Reduced unnecessary computation in common paths, yielding faster assembly and pattern computations, particularly for large-scale problems. - Clear code-level improvements with targeted commits, facilitating maintainability and future optimizations. Technologies/skills demonstrated: - C++ API design and interface stabilization for geometry handling - Performance optimization through pre-checks and path pruning - API extension with gsMultiPatch.domain() and gsCompositeDomain construction - Code tracing and impact assessment of commits on core geometry workflows
March 2025
January 2025
5 Commits • 2 Features
Jan 1, 20252025-01 delivered meaningful improvements to interoperability and visualization for gismo/gismo. Key features include XML I/O improvements with refined interface handling and the introduction of rational B-Spline support, enabling more robust serialization and richer geometric representations. A ParaView export workflow was added with a new example and PVCollection enhancements to support basic geometry, control points, evaluated expressions, Bezier elements, and time-dependent data, facilitating end-to-end visualization and analysis. Documentation was tightened by enforcing light mode in Doxygen for consistent rendering. A cleanup of the codebase removed an extraneous debug print in the expression evaluator. These changes yield improved reliability, faster workflows for visualization, and stronger modeling capabilities, with clear developer docs.
January 2025
5 Commits • 2 Features
Jan 1, 20252025-01 delivered meaningful improvements to interoperability and visualization for gismo/gismo. Key features include XML I/O improvements with refined interface handling and the introduction of rational B-Spline support, enabling more robust serialization and richer geometric representations. A ParaView export workflow was added with a new example and PVCollection enhancements to support basic geometry, control points, evaluated expressions, Bezier elements, and time-dependent data, facilitating end-to-end visualization and analysis. Documentation was tightened by enforcing light mode in Doxygen for consistent rendering. A cleanup of the codebase removed an extraneous debug print in the expression evaluator. These changes yield improved reliability, faster workflows for visualization, and stronger modeling capabilities, with clear developer docs.
November 2024
5 Commits • 1 Features
Nov 1, 2024November 2024 monthly summary for gismo/gismo: Delivered Bezier/NURBS extraction enhancements with rational basis support, improved data organization for Bezier extraction, corrected rational weight computations, refined global/local index handling, and added documentation for ElementBlock. These changes enable accurate rational Bezier visualization in Paraview, correct Bezier extraction for NURBS, and clearer, more maintainable data structures.
5 Commits • 1 Features
Nov 1, 2024November 2024 monthly summary for gismo/gismo: Delivered Bezier/NURBS extraction enhancements with rational basis support, improved data organization for Bezier extraction, corrected rational weight computations, refined global/local index handling, and added documentation for ElementBlock. These changes enable accurate rational Bezier visualization in Paraview, correct Bezier extraction for NURBS, and clearer, more maintainable data structures.
November 2024
October 2024
3 Commits • 2 Features
Oct 1, 2024October 2024 monthly summary for gismo/gismo: Delivered foundational global index mapping utilities and Bezier operator enhancements for Mapped Splines, enabling robust global indexing, consistent Bezier extraction, and improved geometry handling across patches. These changes underpin scalable global assembly and reduce indexing errors in multi-patch scenarios.
October 2024
3 Commits • 2 Features
Oct 1, 2024October 2024 monthly summary for gismo/gismo: Delivered foundational global index mapping utilities and Bezier operator enhancements for Mapped Splines, enabling robust global indexing, consistent Bezier extraction, and improved geometry handling across patches. These changes underpin scalable global assembly and reduce indexing errors in multi-patch scenarios.
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Quality Metrics
Correctness91.0%
Maintainability90.8%
Architecture89.6%
Performance81.8%
AI Usage20.0%
Skills & Technologies
Programming Languages
C++CMakeXML
Technical Skills
Bezier ExtractionBug FixingBuild SystemsC++C++ DevelopmentCode CleanupCode RefactoringComputational GeometryData SerializationData VisualizationDebuggingDocumentationExpression EvaluationGeometry ProcessingGismo Library
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