v3.1.1

This is a bug fix release. There are a few minor API changes. Making way for 3.2.0 work.

There are no documentation updates with this releases.

What's Changed

• Warning as error off by default by @erincatto in #914
• functions to get and set surface material by @erincatto in #921
• Fixed another shape distance assert by @erincatto in #926
• Revolute and prismatic targets by @erincatto in #929
• Cast initial overlap by @erincatto in #933
• Tunable joint stiffness by @erincatto in #934
• _aligned_free for mingw by @erincatto in #939
• Removed MSVC static library setting by @erincatto in #940

Full Changelog: v3.1.0...v3.1.1

v3.1.0

v3.1 Release Notes

API Changes

• 64-bit filter categories and masks
• 64-bit dynamic tree user data
• Renamed b2SmoothSegment to b2ChainSegment
• Cast and overlap functions modified for argument consistency
• Contact begin events now provide the manifold
• More consistent functions to make polygons
• Contact events are now disabled by default
• Replaced b2Timer with uint64_t
• Shape material properties now use b2SurfaceMaterial

New Features

• New character mover features and sample
• Revised sensor system is now independent of body type and sleep
• Rolling resistance and tangent speed
• Friction and restitution mixing callbacks
• World explosions
• World access to the maximum linear speed
• More control over body mass updates
• Filter joint to disable collision between specific bodies
• Bodies can now have names for debugging
• Added b2Body_SetTargetTransform for kinematic bodies

Improvements

• Cross-platform determinism
• Custom SSE2 and Neon for significantly improved performance
• SSE2 is the default instead of AVX2
• Removed SIMDE library dependency
• Faster ray and shape casts
• Faster continuous collision
• Each segment of a chain shape may have a different surface material
• Reduced overhead of restitution when not used
• Implemented atomic platform wrappers eliminating the experimental:c11atomics flag

Bugs Fixes

• Many bug fixes based on user testing
• Fixed missing hit events
• Capsule and polygon manifold fixes
• Fixed missing contact end events
• PreSolve is now called in continuous collision
• Reduced clipping into chain shapes by fast bodies
• Friction and restitution are now remixed in the contact solver every time step
• Body move events are now correctly adjusted for time of impact

Infrastructure

• Unit test for API coverage
• macOS and Windows samples built in GitHub actions
• CMake install
• imgui and glfw versions are now pinned in FetchContent
• Initial Emscripten support

v3.0.0

Version 3.0 is a massive update to Box2D.

Blog post:
https://box2d.org/posts/2024/08/releasing-box2d-3.0/

Migration guide:
https://github.com/erincatto/box2d/blob/main/docs/migration.md

What's Changed

• Update to Version 3 by @erincatto in #769

Full Changelog: v2.4.2...v3.0.0

Final release of version 2

This is the final release of version 2. The next commit with be version 3.0.

This has a few bug fixes, but is mainly being created for people who want to stay on version 2.

What's Changed

• Remove unnecessary function by @erincatto in #659
• Typo fix by @gittem01 in #684
• Update box2d's version of Doctest to latest version by @PatrickHoward in #682
• Create cmake.yml by @erincatto in #707
• Added macos and windows actions by @erincatto in #708
• Issue Fixes by @erincatto in #709
• Making hull builder more robust by @erincatto in #735
• Miscellaneous fixes by @erincatto in #736
• Adjust mouse joint damping with time step by @erincatto in #737
• Add benchmark test by @erincatto in #744

New Contributors

• @gittem01 made their first contribution in #684
• @PatrickHoward made their first contribution in #682

Full Changelog: v2.4.1...v2.4.2

v2.4.1

Changes for version 2.4.1

API Changes

• Extended distance joint to have a minimum and maximum limit.
• Removed rope joint. Use the distance joint instead.
• B2_USER_SETTINGS and b2_user_settings.h can control user data, length units, and maximum polygon vertices.
• Default user data is now uintptr_t instead of void*
• b2FixtureDef::restitutionThreshold lets you set the restitution velocity threshold per fixture.

BREAKING Changes

• BREAKING: distance joint 0 stiffness now means the spring is turned off rather than making the joint rigid.
• BREAKING: distance joint minimum and maximum must be set correctly to get old behavior.

Infrastructure

• Library installation function available in CMake.
• Shared library (DLL) option available.
• Bug fixes

v2.4.0

Changes for version 2.4.0

Infrastructure

• Documentation in Doxygen format
• CMake build system
• Unit test support
• Continuous integration testing using Travis CI
• Limited use of C++11 (nullptr and override)
• Restructured folders and renamed files to better match open-source standards
• MIT License
• Removed float32 and float64
• Linked the Box2D project to GitHub Sponsors

Collision

• Chain and edge shape must now be one-sided to eliminate ghost collisions
• Broad-phase optimizations
• Added b2ShapeCast for linear shape casting

Dynamics

• Joint limits are now predictive and not stateful
• Experimental 2D cloth (rope)
• b2Body::SetActive -> b2Body::SetEnabled
• Better support for running multiple worlds
• Handle zero density better
  • The body behaves like a static body
  • The body is drawn with a red color
• Added translation limit to wheel joint
• World dump now writes to box2d_dump.inl
• Static bodies are never awake
• All joints with spring-dampers now use stiffness and damping
• Added utility functions to convert frequency and damping ratio to stiffness and damping

Testbed

• Testbed uses dear imgui
• glad OpenGL loader
• OpenGL 3.3 required