st-tech/ppf-contact-solver

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A contact solver for physics-based simulations involving 👚 shells, 🪵 solids, 🪢 rods, 🧱 rigid bodies and ⏳ sand.

Stars: 4.5k
Forks: 334
Open beginner issues: 0
Indexed issues: 89

Dominant language: Python
License: Apache-2.0
Last GitHub push: Sep 20, 2026
Latest indexed: Sep 20, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: No beginner labels indexed
PR merge metrics: No merged PRs in 30d

Beginner friendly Everything

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89 open issues indexed

[Bug] Flip Direction has no effect on a pin Spin operation for solids Open

bug deployed worked

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

st-tech/ppf-contact-solver#149 · 3 comments · Opened Sep 14, 2026
[Bug] Cards in cards.ipynb slip and collapse before the ball hits them Open

bug deployed worked

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

st-tech/ppf-contact-solver#147 · 4 comments · Opened Sep 8, 2026
[Feature] Simulating Hair Curves Open

enhancement queued

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

st-tech/ppf-contact-solver#146 · 3 comments · Opened Sep 5, 2026
[Bug] No Autosaves while the Addon is active Open

bug deployed worked

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

st-tech/ppf-contact-solver#145 · 3 comments · Opened Sep 2, 2026
[Bug] Build failed: Solver stopped on a failed internal check: PPF FATAL: PCG breakdown -- p^T A p is not-a-number at iter 0 (detected at check iter 1, reresid nan). Open

bug deployed worked

Difficulty 4/5 3-5 days Newbie friendliness 25/100

st-tech/ppf-contact-solver#144 · 7 comments · Opened Aug 28, 2026
[Bug] Clear Local Animation can fail without Error Open

bug deployed worked

Difficulty 4/5 3-5 days Newbie friendliness 50/100

st-tech/ppf-contact-solver#143 · 3 comments · Opened Aug 26, 2026
[Feature] animatable pressure value Open

deployed enhancement worked

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

st-tech/ppf-contact-solver#142 · 5 comments · Opened Aug 25, 2026
[Feature] Enable support for Pascal Architecture (GTX 10-series / sm_61) and Turing (GTX 16-series / sm_75) Open

deployed enhancement worked

Difficulty 4/5 3-5 days Newbie friendliness 64/100

st-tech/ppf-contact-solver#141 · 8 comments · Opened Aug 22, 2026
[Bug -> Feature] Locking rotation is not working Open

bug deployed worked

Difficulty 4/5 3-5 days Newbie friendliness 52/100

st-tech/ppf-contact-solver#139 · 8 comments · Opened Aug 13, 2026
[Feature] Allow intersections for pinning Deformation Capture Open

deployed enhancement worked

Difficulty 4/5 3-5 days Newbie friendliness 52/100

st-tech/ppf-contact-solver#138 · 9 comments · Opened Aug 11, 2026
[Feature] Give the add-on a preferences panel, with a language setting in it Open

enhancement queued

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

st-tech/ppf-contact-solver#137 · 4 comments · Opened Aug 11, 2026
[Bug] Deleting a group while server runs ends in manifest error Open

bug deployed worked

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

st-tech/ppf-contact-solver#133 · 6 comments · Opened Aug 10, 2026
[Feature] Anisotropic (warp/weft) bending for shells with UVs Open

deployed enhancement worked

Difficulty 5/5 Over a week Newbie friendliness 48/100

st-tech/ppf-contact-solver#130 · 2 comments · Opened Aug 5, 2026
[Bug] device-side assert triggered in contact/contact.cu at line 1633 Open

bug deployed worked

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

st-tech/ppf-contact-solver#129 · 5 comments · Opened Aug 4, 2026
[Bug] set_scene_parameters does not expand scene.frame_end Open

bug deployed worked

Difficulty 3/5 1-2 days Newbie friendliness 70/100

st-tech/ppf-contact-solver#127 · 3 comments · Opened Aug 3, 2026
[Bug] Solver exited abnormally: pid XXXXXX stopped after frame 38 without writing a terminal outcome (segfault / OOM-kill / unrecoverable abort) Open

bug deployed worked

Difficulty 4/5 3-5 days Newbie friendliness 42/100

st-tech/ppf-contact-solver#124 · 5 comments · Opened Aug 1, 2026
[Feature] Way to select which GPU the Windows Native server uses Open

deployed enhancement worked

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

st-tech/ppf-contact-solver#123 · 2 comments · Opened Aug 1, 2026
[Feature] Animated spatial material properties for shell objects Open

deployed enhancement worked

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

st-tech/ppf-contact-solver#120 · 5 comments · Opened Jul 30, 2026
[Feature] pin group mesh type selector Open

enhancement queued

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

st-tech/ppf-contact-solver#118 · 1 comment · Opened Jul 29, 2026
[Bug] Solver crashes on the Squishy Balls and Animal Well scenes from "Elastodynamics without Barriers" (SIGGRAPH 2026) Open

bug deployed worked

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

st-tech/ppf-contact-solver#117 · 6 comments · Opened Jul 28, 2026
[Bug] Contact Starts Overlapping error Open

bug worked

Difficulty 4/5 3-5 days Newbie friendliness 38/100

st-tech/ppf-contact-solver#116 · 5 comments · Opened Jul 27, 2026
[Feature] Support Blender force fields (e.g. turbulence) on soft body objects Open

enhancement queued

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

st-tech/ppf-contact-solver#114 · 1 comment · Opened Jul 23, 2026
[Bug] Soft body object sticks to the edge of a collider object Open

bug deployed worked

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

st-tech/ppf-contact-solver#113 · 5 comments · Opened Jul 23, 2026
[Bug] Cloth with Rigid Body doesnt use schwarz Open

bug deployed worked

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

st-tech/ppf-contact-solver#111 · 4 comments · Opened Jul 22, 2026
[Bug] Intersection / self-intersection failures on animated cape cloth Open

bug deployed worked

Difficulty 4/5 3-5 days Newbie friendliness 42/100

st-tech/ppf-contact-solver#110 · 33 comments · Opened Jul 16, 2026
[Bug] Applying Pin Configuration step have become really slow between v.1.0.13 and v.1.0.14 Open

bug deployed worked

Difficulty 4/5 3-5 days Newbie friendliness 50/100

st-tech/ppf-contact-solver#108 · 15 comments · Opened Jul 16, 2026
[Bug] Pin vertex group dropdown displays garbled text when the vertex group name contains Japanese characters Open

bug deployed worked

Difficulty 3/5 1-2 days Newbie friendliness 55/100

st-tech/ppf-contact-solver#107 · 5 comments · Opened Jul 15, 2026
[Feature] Improve default values in the blender addon UI for docker Open

enhancement worked

Difficulty 2/5 1-3 hours Newbie friendliness 58/100

st-tech/ppf-contact-solver#106 · 2 comments · Opened Jul 13, 2026
[Feature] Solid Squish Control Open

enhancement queued

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

st-tech/ppf-contact-solver#101 · 5 comments · Opened Jul 7, 2026
[Bug] Simulation or result cache sometimes drops frames Open

bug deployed worked

Difficulty 4/5 3-5 days Newbie friendliness 42/100

st-tech/ppf-contact-solver#100 · 22 comments · Opened Jul 7, 2026
[Bug] Sand grains stick to slope surface and fall endlessly instead of clearing quickly Open

bug queued

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

st-tech/ppf-contact-solver#99 · Opened Jul 7, 2026
[Feature] Centralized UI localization Open

deployed enhancement worked

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

st-tech/ppf-contact-solver#97 · 3 comments · 1 reaction · Opened Jul 3, 2026
[Bug] Snap and merge not working as intended Open

bug worked

Difficulty 4/5 3-5 days Newbie friendliness 42/100

st-tech/ppf-contact-solver#96 · 4 comments · Opened Jul 3, 2026
[Feature] Animate pin activation Open

enhancement queued

Difficulty 5/5 Over a week Newbie friendliness 38/100

st-tech/ppf-contact-solver#95 · 4 comments · 1 reaction · Opened Jul 3, 2026
[Feature] Resuming Simulation and Self-Intersections Open

enhancement worked

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

st-tech/ppf-contact-solver#93 · 7 comments · Opened Jul 2, 2026
[Bug] Named symbol not found / Unrecoverable CUDA runtime or driver error Open

bug deployed worked

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

st-tech/ppf-contact-solver#92 · 5 comments · Opened Jul 1, 2026
[Bug] Not compatible with Pyuthon 3.14 Open

bug queued

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

st-tech/ppf-contact-solver#91 · 4 comments · Opened Jun 30, 2026
[Bug] [Errno 2] No such file or directory: Open

bug deployed worked

Difficulty 3/5 1-2 days Newbie friendliness 45/100

st-tech/ppf-contact-solver#85 · 3 comments · Opened Jun 24, 2026
[Bug] there is no "ppf-cts-server.exe" to be found anywhere on my computer. even when I unpack the zip file Open

bug worked

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

st-tech/ppf-contact-solver#83 · 2 comments · Opened Jun 22, 2026
[Feature] Sand (granular) simulation: loose grains that roll and pile Open

deployed enhancement worked

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

st-tech/ppf-contact-solver#82 · 7 comments · Opened Jun 22, 2026
[Feature] Export simulated results to USD/Alembic Open

deployed enhancement worked

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

st-tech/ppf-contact-solver#81 · 2 comments · 2 reactions · Opened Jun 22, 2026
[Feature] Allow simulation to start from an arbitrary Blender frame Open

deployed enhancement worked

Difficulty 4/5 3-5 days Newbie friendliness 52/100

st-tech/ppf-contact-solver#80 · 3 comments · 1 reaction · Opened Jun 22, 2026
[Feature] make deformation capture happen automatically when pressing transfer Open

deployed enhancement worked

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

st-tech/ppf-contact-solver#79 · 3 comments · Opened Jun 20, 2026
[Feature] Velocity Override for static / rigidbody Open

deployed enhancement worked

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

st-tech/ppf-contact-solver#76 · 3 comments · Opened Jun 17, 2026
[Feature] output metrics for each frame, such as pressure, acceleration, velocity, and displacement Open

deployed enhancement worked

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

st-tech/ppf-contact-solver#75 · 8 comments · Opened Jun 17, 2026
[Feature] Axial lock (translation and rotation) Open

deployed enhancement worked

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

st-tech/ppf-contact-solver#74 · 3 comments · Opened Jun 17, 2026
[Bug] Capture Deformation on SOLID object with character rig causes inconsistent pin behavior Open

bug deployed worked

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

st-tech/ppf-contact-solver#73 · 21 comments · Opened Jun 14, 2026
[Bug] simulation doesn't run (and doesn't display error) if an edge has a vertex midway. (sewing) Open

bug deployed worked

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

st-tech/ppf-contact-solver#72 · 3 comments · Opened Jun 10, 2026
[Feature] Preset materials, please. Open

deployed enhancement worked

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

st-tech/ppf-contact-solver#71 · 4 comments · Opened Jun 10, 2026
[Bug] Cannot Snap and Merge Solid to Solid or Solid to Static Open

bug deployed worked

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

st-tech/ppf-contact-solver#70 · 6 comments · Opened Jun 4, 2026

st-tech/ppf-contact-solver

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