RobotLocomotion/drake
Nov 2024 – Jul 2026
5 Months active
Languages Used
C++Python
Technical Skills
C++ DevelopmentComputational GeometryGeometry ProcessingPython DevelopmentSoftware DesignSoftware Engineering
Joe Masterjohn
PROFILE
Joe Masterjohn
Over five months, contributed to RobotLocomotion/drake by developing advanced geometry processing, simulation, and constraint modeling features using C++ and Python. Delivered robust mesh enhancements for both hard and soft geometries, accelerating calculations and enabling richer proximity queries. Improved hydroelastic contact modeling by implementing compliant mesh intersection algorithms and optimizing test performance for faster CI feedback. Expanded the multibody dynamics toolkit with SAP-compatible tendon constraints and enhanced solver fidelity through new ball constraint support and CRTP-based refactoring of holonomic constraints. Focused on performance optimization, numerical methods, and maintainable software design, consistently reducing maintenance overhead while enabling more accurate and extensible simulations.
Overall Statistics
Feature vs Bugs
83%Features
Repository Contributions
10Total
Bugs
1
Commits
10
Features
5
Lines of code
8,796
Activity Months5
Your Network
39 peopleShared Repositories
39
Work History
July 2026
2 Commits • 1 Features
Jul 1, 2026July 2026: Drake multibody solver constraint enhancements. Focused on delivering new capabilities and reducing maintenance cost in the solver’s constraint subsystem for RobotLocomotion/drake. Key work included adding ball constraint support for the CENIC integrator within the IcfSolver and refactoring holonomic constraints into a consolidated CRTP-based base to reduce duplication and simplify future maintenance. These improvements enhance modeling fidelity for complex mechanisms, improve solver robustness, and set the stage for future constraint-driven features.
2 Commits • 1 Features
Jul 1, 2026July 2026: Drake multibody solver constraint enhancements. Focused on delivering new capabilities and reducing maintenance cost in the solver’s constraint subsystem for RobotLocomotion/drake. Key work included adding ball constraint support for the CENIC integrator within the IcfSolver and refactoring holonomic constraints into a consolidated CRTP-based base to reduce duplication and simplify future maintenance. These improvements enhance modeling fidelity for complex mechanisms, improve solver robustness, and set the stage for future constraint-driven features.
July 2026
March 2025
3 Commits • 1 Features
Mar 1, 2025In March 2025, delivered SAP-compatible tendon constraint support for MultibodyPlant in Drake, enabling unilateral tendon constraints with configurable stiffness, damping, and bounds for both continuous and discrete plant models. Implemented SapFixedTendonConstraint class and added MultibodyPlant::AddTendonConstraint() APIs, expanding modeling capabilities and solver integration for tendon-based dynamics. Key commits include 4518d6190f5b5957bc2fe343882607ce48e81533, d947d5d26b2bb58f2586b5c40badd52566b8f859, 483f3c616a031114992918c242e20036a5a531a0, tied to PRs #22711, #22717, #22803. Impact: improved fidelity for tendon-driven mechanisms, enhanced SAP solver compatibility, and a stronger API surface for future features. Skills demonstrated: C++ API design, solver integration, and end-to-end testing across continuous and discrete models.
March 2025
3 Commits • 1 Features
Mar 1, 2025In March 2025, delivered SAP-compatible tendon constraint support for MultibodyPlant in Drake, enabling unilateral tendon constraints with configurable stiffness, damping, and bounds for both continuous and discrete plant models. Implemented SapFixedTendonConstraint class and added MultibodyPlant::AddTendonConstraint() APIs, expanding modeling capabilities and solver integration for tendon-based dynamics. Key commits include 4518d6190f5b5957bc2fe343882607ce48e81533, d947d5d26b2bb58f2586b5c40badd52566b8f859, 483f3c616a031114992918c242e20036a5a531a0, tied to PRs #22711, #22717, #22803. Impact: improved fidelity for tendon-driven mechanisms, enhanced SAP solver compatibility, and a stronger API surface for future features. Skills demonstrated: C++ API design, solver integration, and end-to-end testing across continuous and discrete models.
January 2025
1 Commits • 1 Features
Jan 1, 2025January 2025 monthly summary for RobotLocomotion/drake focusing on delivering a robust hydroelastic intersection feature that enhances simulation fidelity and contact surface accuracy.
1 Commits • 1 Features
Jan 1, 2025January 2025 monthly summary for RobotLocomotion/drake focusing on delivering a robust hydroelastic intersection feature that enhances simulation fidelity and contact surface accuracy.
January 2025
December 2024
2 Commits • 1 Features
Dec 1, 2024December 2024: Focused on stability and test-performance in Drake. Fixed hydroelastic property parameter passing (radius_) for AddCompliantHydroElasticProperties and optimized the joint_locking_test resolution hints, reducing costly test executions. Accelerated cylinder mesh test suite by reducing iterations in VolumeConvergence and removing ultra-fine resolution hints in EulerCharacteristic tests. These changes improve CI throughput and enable faster iteration on hydroelastic and geometry features. Technologies demonstrated include C++, test harness optimization, and geometry/multibody modeling. Commit references: 0a6efd0e2e87f8be4e1c2b195f10c4677b8b2630; 490033e1f4a958b7396fdc7db2f4c7c09fbf3b3c.
December 2024
2 Commits • 1 Features
Dec 1, 2024December 2024: Focused on stability and test-performance in Drake. Fixed hydroelastic property parameter passing (radius_) for AddCompliantHydroElasticProperties and optimized the joint_locking_test resolution hints, reducing costly test executions. Accelerated cylinder mesh test suite by reducing iterations in VolumeConvergence and removing ultra-fine resolution hints in EulerCharacteristic tests. These changes improve CI throughput and enable faster iteration on hydroelastic and geometry features. Technologies demonstrated include C++, test harness optimization, and geometry/multibody modeling. Commit references: 0a6efd0e2e87f8be4e1c2b195f10c4677b8b2630; 490033e1f4a958b7396fdc7db2f4c7c09fbf3b3c.
November 2024
2 Commits • 1 Features
Nov 1, 2024November 2024: Delivered core geometry enhancements for Drake's mesh systems, establishing a more robust foundation for hard and soft geometry processing and proximity queries. Refactors and tests improve clarity, performance, and reliability, enabling richer simulations and easier future extension.
2 Commits • 1 Features
Nov 1, 2024November 2024: Delivered core geometry enhancements for Drake's mesh systems, establishing a more robust foundation for hard and soft geometry processing and proximity queries. Refactors and tests improve clarity, performance, and reliability, enabling richer simulations and easier future extension.
November 2024
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Quality Metrics
Correctness97.0%
Maintainability95.0%
Architecture96.0%
Performance80.0%
AI Usage32.0%
Skills & Technologies
Programming Languages
C++Python
Technical Skills
BazelC++C++ DevelopmentCRTPCollision DetectionComputational GeometryConstraint ModelingConstraint SolversEigenFinite Element MethodGeometry ProcessingMultibody DynamicsNumerical MethodsNumerical OptimizationNumerical Simulation
Repositories Contributed To
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