erincatto

Issues somebody may already be working on are listed last. List everything by date

• Pre-solve manifold anchors are relative to body origins, not centers of mass

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  Difficulty 2/5 1-3 hours Newbie friendliness 68/100

  erincatto/box2d#1132 · Opened Nov 8, 2026

• b2Shape_ApplyWind reads a freed body sim when it wakes a sleeping body

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  Difficulty 1/5 Under an hour Newbie friendliness 88/100

  erincatto/box2d#1131 · Opened Nov 8, 2026

• Heavy spheres sink into translation-locked dynamic platforms

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  Difficulty 4/5 3-5 days Newbie friendliness 48/100

  erincatto/box3d#211 · Opened Nov 3, 2026

• Large capsules fall through densely tessellated heightfields

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  Difficulty 4/5 3-5 days Newbie friendliness 55/100

  erincatto/box3d#210 · Opened Nov 3, 2026

• Surface materials and recycling

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  Difficulty 4/5 3-5 days Newbie friendliness 22/100

  erincatto/box3d#209 · Opened Nov 2, 2026

• Data race: joints to a kinematic body share a graph colour, so warm start writes its state from several workers

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  Difficulty 4/5 3-5 days Newbie friendliness 22/100

  erincatto/box3d#208 · Opened Nov 2, 2026

• Feature request: b3Capacity::stackByteCount (initial size of the per-step stack allocator)

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  Difficulty 3/5 1-2 days Newbie friendliness 42/100

  erincatto/box3d#207 · Opened Nov 2, 2026

• b3Shape_SetSphere/SetCapsule/SetHull keep the old localCentroid (CCD radius can come out too small)

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  Difficulty 2/5 1-3 hours Newbie friendliness 68/100

  erincatto/box3d#206 · Opened Nov 2, 2026

• Wheel joint warm start applies the spin impulse twice with steering disabled

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  Difficulty 2/5 1-3 hours Newbie friendliness 78/100

  erincatto/box3d#205 · Opened Oct 29, 2026

• Revolute spring max torque

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  Difficulty 5/5 Over a week Newbie friendliness 20/100

  erincatto/box2d#1128 · Opened Oct 29, 2026

• UBSan alignment failure in SSE2 b3LoadV (`float*` cast to `double*`)

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  Difficulty 2/5 1-3 hours Newbie friendliness 72/100

  erincatto/box3d#203 · Opened Oct 27, 2026

• Doc items

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  Difficulty 2/5 1-3 hours Newbie friendliness 65/100

  erincatto/box2d#1126 · Opened Oct 21, 2026

• Geometric Mover sample treats a TOI miss as an impact

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  Difficulty 2/5 1-3 hours Newbie friendliness 79/100

  erincatto/box3d#200 · Opened Oct 20, 2026

• Add ability to re-set the debug shape callbacks

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  Difficulty 3/5 1-2 days Newbie friendliness 48/100

  erincatto/box3d#199 · Opened Oct 20, 2026

• Revolute joint spring takes the long way round when the target is across ±π

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  Difficulty 2/5 1-3 hours Newbie friendliness 83/100

  erincatto/box3d#198 · Opened Oct 19, 2026

• Heap-buffer-overflow in b3TrySleepIsland when a body is put to sleep right after a snapshot restore (b3ValidateReplay crashes)

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  Difficulty 4/5 3-5 days Newbie friendliness 48/100

  erincatto/box3d#197 · Opened Oct 19, 2026

• buoyancy support

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  Difficulty 5/5 Over a week Newbie friendliness 24/100

  erincatto/box3d#193 · Opened Oct 18, 2026

• more shapes

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  Difficulty 5/5 Over a week Newbie friendliness 25/100

  erincatto/box3d#192 · Opened Oct 18, 2026

• Motor joint keeps applying its old impulse after the spring/motor limit is set to 0

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  Difficulty 3/5 1-2 days Newbie friendliness 62/100

  erincatto/box3d#190 · Opened Oct 14, 2026

• MacOS debug builds lack debug symbols

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  Difficulty 3/5 Half a day Newbie friendliness 38/100

  erincatto/box3d#188 · Opened Oct 14, 2026

• Time of impact varies with tree order

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  enhancement

  Difficulty 4/5 3-5 days Newbie friendliness 45/100

  erincatto/box3d#186 · 3 comments · Opened Oct 12, 2026

• Mesh contacts silently drop triangles past B3_MAX_MESH_CONTACT_TRIANGLES; CCD can then stop a body at a face the solver never sees

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  Difficulty 4/5 3-5 days Newbie friendliness 32/100

  erincatto/box3d#184 · 1 comment · Opened Oct 8, 2026

• Update integrated Box2D in Godot

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  Difficulty 5/5 Over a week Newbie friendliness 25/100

  erincatto/godot-box2d#2 · Opened Oct 4, 2026

• Use-after-free in b3Shape_ApplyWind when waking a sleeping body

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  Difficulty 3/5 1-2 days Newbie friendliness 65/100

  erincatto/box3d#167 · Opened Sep 23, 2026

• Profiler timers allocate JS garbage on every clock read under Emscripten

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  Difficulty 3/5 1-2 days Newbie friendliness 50/100

  erincatto/box3d#165 · 2 comments · Opened Sep 22, 2026

• Optimize Broad-Phase (#159) holds a driven body motionless in a many-body world

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  Difficulty 5/5 Over a week Newbie friendliness 35/100

  erincatto/box3d#164 · 2 comments · Opened Sep 20, 2026

• Compilation failing to link in 32-bit MSVC (Lime NDLL)

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  Difficulty 2/5 1-3 hours Newbie friendliness 82/100

  erincatto/box3d#158 · Opened Sep 15, 2026

• Direct solver for joints

  May be free again @erincatto claimed this 71 days ago, and no pull request is open. Open

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  enhancement

  erincatto/box3d#147 · 3 reactions · 1 assignee · Opened Aug 30, 2026

• Spherical motor velocity in frameA

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  Difficulty 5/5 Over a week Newbie friendliness 30/100

  erincatto/box3d#139 · 1 reaction · Opened Aug 23, 2026

• Expose world snapshot/restore API for rollback and simulation branching

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  Difficulty 5/5 Over a week Newbie friendliness 35/100

  erincatto/box3d#134 · 3 comments · 7 reactions · Opened Aug 18, 2026

• Discuss support for freestanding WebAssembly with atomics

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  Difficulty 5/5 Over a week Newbie friendliness 35/100

  erincatto/box3d#127 · 5 comments · Opened Aug 12, 2026

• Tasks v0.2

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  Difficulty 5/5 Over a week Newbie friendliness 20/100

  erincatto/box3d#81 · Opened Jul 15, 2026

• Documentation Tasks

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  Difficulty 3/5 3-5 days Newbie friendliness 45/100

  erincatto/box3d#80 · Opened Jul 15, 2026

• b3Manifold.rollingImpulse reported as ~0 under sub-stepping for steadily-rolling contacts

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  Difficulty 4/5 3-5 days Newbie friendliness 70/100

  erincatto/box3d#73 · 3 comments · Opened Jul 12, 2026

• Shape casts starting near a surface report an instant hit even when receding

  May be free again A pull request for this issue was closed without being merged. Open

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  Difficulty 4/5 3-5 days Newbie friendliness 35/100

  erincatto/box3d#32 · 2 reactions · Opened Jul 2, 2026

• Faster CCD across meshes

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  Difficulty 4/5 3-5 days Newbie friendliness 35/100

  erincatto/box3d#15 · 1 comment · Opened Jun 17, 2026

• Donut sleep

  May be free again @erincatto claimed this 232 days ago, and no pull request is open. Open

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  bug

  erincatto/box2d#1041 · 1 assignee · Opened Mar 22, 2026

• XPBD achieves the same stiffness as TGS_NGS in BallAndChain and Bridge scenes using a 2×2 effective mass matrix.

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  Difficulty 4/5 3-5 days Newbie friendliness 45/100

  erincatto/solver2d#23 · Opened Nov 14, 2025

• Will the C language version support liquid like liquidFun in the future?

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  enhancement

  Difficulty 5/5 Over a week Newbie friendliness 15/100

  erincatto/box2d#996 · 2 comments · Opened Oct 5, 2025

• Crash with prismatic joint

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  bug

  Difficulty 4/5 3-5 days Newbie friendliness 45/100

  erincatto/box2d#984 · 3 comments · Opened Sep 18, 2025

• Optimize sensors for sleeping and statics

  May be free again @erincatto claimed this 454 days ago, and no pull request is open. Open

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  performance

  erincatto/box2d#969 · 1 comment · 1 assignee · Opened Aug 11, 2025

• v3.2 Tasks

  May be free again @erincatto claimed this 564 days ago, and no pull request is open. Open

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  erincatto/box2d#839 · 5 comments · 20 reactions · 1 assignee · Opened Nov 14, 2024

• Try Unity Physics solver

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  Difficulty 5/5 Over a week Newbie friendliness 15/100

  erincatto/solver2d#20 · Opened Nov 10, 2024

• Analytic Solutions

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  Difficulty 5/5 Over a week Newbie friendliness 25/100

  erincatto/solver2d#17 · Opened Jul 4, 2024

• Try VBD

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  Difficulty 5/5 Over a week Newbie friendliness 25/100

  erincatto/solver2d#16 · 1 comment · Opened May 12, 2024

• try doubles

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  Difficulty 5/5 Over a week Newbie friendliness 20/100

  erincatto/solver2d#7 · Opened Jan 21, 2024