Pbd solver by VincentChen1113 · Pull Request #11 · sam007961/FastMassSpring

VincentChen1113 · 2026-05-09T02:21:17Z

No description provided.

…cture.

…lver.h/.cpp and pbd_system- add basic initialization, force update, and damping structure- support mode-based switching between mass-spring and PBD demos- make PBD hang/drop demos runnable without interaction or collisions- preserve existing rendering and mesh framework.

…both system. Applied mouse drag point as a fixed point for pdb system.

… Implement Distance, FixedPoint, and SphereCollision constraints- Separate persistent vs per-step collision constraints- Add generateCollisionConstraints() stage- Update solver pipeline: forces → damping → predict → collisions → project → update → commit- Implement iteration-corrected stiffness k' = 1 - (1 - k)^(1/ns)- Add generic projection formulationMaintains existing PBDSolver API; build clean and demo runs.

…g section.

…r's dihedral angle constraint projection. The projection procedures followed the formulation in the paper's appendix B.

…he constraint variables to achieve a better visual result

…ossing/thickness-band filtering, and tuned thickness/contact limits.

…n debug counters

…ntactsPerVertex to 4.

…nd to the botom half of the cloth.

…ading.

…ure to the wind demo.

…e README to include dropping on dual objects demo.

…e instruction.

…or instruction.

…ace instruction.

…ion. Attach a wind direction indicator on the left bottom of the window for better visual understanding.

VincentChen1113 · 2026-05-09T02:21:17Z

No description provided.

…cture.

…lver.h/.cpp and pbd_system- add basic initialization, force update, and damping structure- support mode-based switching between mass-spring and PBD demos- make PBD hang/drop demos runnable without interaction or collisions- preserve existing rendering and mesh framework.

…both system. Applied mouse drag point as a fixed point for pdb system.

… Implement Distance, FixedPoint, and SphereCollision constraints- Separate persistent vs per-step collision constraints- Add generateCollisionConstraints() stage- Update solver pipeline: forces → damping → predict → collisions → project → update → commit- Implement iteration-corrected stiffness k' = 1 - (1 - k)^(1/ns)- Add generic projection formulationMaintains existing PBDSolver API; build clean and demo runs.

…g section.

…r's dihedral angle constraint projection. The projection procedures followed the formulation in the paper's appendix B.

…he constraint variables to achieve a better visual result

…ossing/thickness-band filtering, and tuned thickness/contact limits.

…n debug counters

…ntactsPerVertex to 4.

…nd to the botom half of the cloth.

…ading.

…ure to the wind demo.

…e README to include dropping on dual objects demo.

…e instruction.

…or instruction.

…ace instruction.

…ion. Attach a wind direction indicator on the left bottom of the window for better visual understanding.

VincentChen1113 · 2026-05-09T02:21:17Z

No description provided.

…cture.

…lver.h/.cpp and pbd_system- add basic initialization, force update, and damping structure- support mode-based switching between mass-spring and PBD demos- make PBD hang/drop demos runnable without interaction or collisions- preserve existing rendering and mesh framework.

…both system. Applied mouse drag point as a fixed point for pdb system.

… Implement Distance, FixedPoint, and SphereCollision constraints- Separate persistent vs per-step collision constraints- Add generateCollisionConstraints() stage- Update solver pipeline: forces → damping → predict → collisions → project → update → commit- Implement iteration-corrected stiffness k' = 1 - (1 - k)^(1/ns)- Add generic projection formulationMaintains existing PBDSolver API; build clean and demo runs.

…g section.

…r's dihedral angle constraint projection. The projection procedures followed the formulation in the paper's appendix B.

…he constraint variables to achieve a better visual result

…ossing/thickness-band filtering, and tuned thickness/contact limits.

…n debug counters

…ntactsPerVertex to 4.

…nd to the botom half of the cloth.

…ading.

…ure to the wind demo.

…e README to include dropping on dual objects demo.

…e instruction.

…or instruction.

…ace instruction.

…ion. Attach a wind direction indicator on the left bottom of the window for better visual understanding.

VincentChen1113 · 2026-05-09T02:21:17Z

No description provided.

…cture.

…lver.h/.cpp and pbd_system- add basic initialization, force update, and damping structure- support mode-based switching between mass-spring and PBD demos- make PBD hang/drop demos runnable without interaction or collisions- preserve existing rendering and mesh framework.

…both system. Applied mouse drag point as a fixed point for pdb system.

… Implement Distance, FixedPoint, and SphereCollision constraints- Separate persistent vs per-step collision constraints- Add generateCollisionConstraints() stage- Update solver pipeline: forces → damping → predict → collisions → project → update → commit- Implement iteration-corrected stiffness k' = 1 - (1 - k)^(1/ns)- Add generic projection formulationMaintains existing PBDSolver API; build clean and demo runs.

…g section.

…r's dihedral angle constraint projection. The projection procedures followed the formulation in the paper's appendix B.

…he constraint variables to achieve a better visual result

…ossing/thickness-band filtering, and tuned thickness/contact limits.

…n debug counters

…ntactsPerVertex to 4.

…nd to the botom half of the cloth.

…ading.

…ure to the wind demo.

…e README to include dropping on dual objects demo.

…e instruction.

…or instruction.

…ace instruction.

…ion. Attach a wind direction indicator on the left bottom of the window for better visual understanding.

VincentChen1113 · 2026-05-09T02:21:17Z

No description provided.

…cture.

…lver.h/.cpp and pbd_system- add basic initialization, force update, and damping structure- support mode-based switching between mass-spring and PBD demos- make PBD hang/drop demos runnable without interaction or collisions- preserve existing rendering and mesh framework.

…both system. Applied mouse drag point as a fixed point for pdb system.

… Implement Distance, FixedPoint, and SphereCollision constraints- Separate persistent vs per-step collision constraints- Add generateCollisionConstraints() stage- Update solver pipeline: forces → damping → predict → collisions → project → update → commit- Implement iteration-corrected stiffness k' = 1 - (1 - k)^(1/ns)- Add generic projection formulationMaintains existing PBDSolver API; build clean and demo runs.

…g section.

…r's dihedral angle constraint projection. The projection procedures followed the formulation in the paper's appendix B.

…he constraint variables to achieve a better visual result

…ossing/thickness-band filtering, and tuned thickness/contact limits.

…n debug counters

…ntactsPerVertex to 4.

…nd to the botom half of the cloth.

…ading.

…ure to the wind demo.

…e README to include dropping on dual objects demo.

…e instruction.

…or instruction.

…ace instruction.

…ion. Attach a wind direction indicator on the left bottom of the window for better visual understanding.

VincentChen1113 · 2026-05-09T02:21:17Z

No description provided.

…cture.

…lver.h/.cpp and pbd_system- add basic initialization, force update, and damping structure- support mode-based switching between mass-spring and PBD demos- make PBD hang/drop demos runnable without interaction or collisions- preserve existing rendering and mesh framework.

…both system. Applied mouse drag point as a fixed point for pdb system.

… Implement Distance, FixedPoint, and SphereCollision constraints- Separate persistent vs per-step collision constraints- Add generateCollisionConstraints() stage- Update solver pipeline: forces → damping → predict → collisions → project → update → commit- Implement iteration-corrected stiffness k' = 1 - (1 - k)^(1/ns)- Add generic projection formulationMaintains existing PBDSolver API; build clean and demo runs.

…g section.

…r's dihedral angle constraint projection. The projection procedures followed the formulation in the paper's appendix B.

…he constraint variables to achieve a better visual result

…ossing/thickness-band filtering, and tuned thickness/contact limits.

…n debug counters

…ntactsPerVertex to 4.

…nd to the botom half of the cloth.

…ading.

…ure to the wind demo.

…e README to include dropping on dual objects demo.

…e instruction.

…or instruction.

…ace instruction.

…ion. Attach a wind direction indicator on the left bottom of the window for better visual understanding.

VincentChen1113 · 2026-05-09T02:21:17Z

No description provided.

…cture.

…lver.h/.cpp and pbd_system- add basic initialization, force update, and damping structure- support mode-based switching between mass-spring and PBD demos- make PBD hang/drop demos runnable without interaction or collisions- preserve existing rendering and mesh framework.

…both system. Applied mouse drag point as a fixed point for pdb system.

… Implement Distance, FixedPoint, and SphereCollision constraints- Separate persistent vs per-step collision constraints- Add generateCollisionConstraints() stage- Update solver pipeline: forces → damping → predict → collisions → project → update → commit- Implement iteration-corrected stiffness k' = 1 - (1 - k)^(1/ns)- Add generic projection formulationMaintains existing PBDSolver API; build clean and demo runs.

…g section.

…r's dihedral angle constraint projection. The projection procedures followed the formulation in the paper's appendix B.

…he constraint variables to achieve a better visual result

…ossing/thickness-band filtering, and tuned thickness/contact limits.

…n debug counters

…ntactsPerVertex to 4.

…nd to the botom half of the cloth.

…ading.

…ure to the wind demo.

…e README to include dropping on dual objects demo.

…e instruction.

…or instruction.

…ace instruction.

…ion. Attach a wind direction indicator on the left bottom of the window for better visual understanding.

VincentChen1113 · 2026-05-09T02:21:17Z

No description provided.

…cture.

…lver.h/.cpp and pbd_system- add basic initialization, force update, and damping structure- support mode-based switching between mass-spring and PBD demos- make PBD hang/drop demos runnable without interaction or collisions- preserve existing rendering and mesh framework.

…both system. Applied mouse drag point as a fixed point for pdb system.

… Implement Distance, FixedPoint, and SphereCollision constraints- Separate persistent vs per-step collision constraints- Add generateCollisionConstraints() stage- Update solver pipeline: forces → damping → predict → collisions → project → update → commit- Implement iteration-corrected stiffness k' = 1 - (1 - k)^(1/ns)- Add generic projection formulationMaintains existing PBDSolver API; build clean and demo runs.

…g section.

…r's dihedral angle constraint projection. The projection procedures followed the formulation in the paper's appendix B.

…he constraint variables to achieve a better visual result

…ossing/thickness-band filtering, and tuned thickness/contact limits.

…n debug counters

…ntactsPerVertex to 4.

…nd to the botom half of the cloth.

…ading.

…ure to the wind demo.

…e README to include dropping on dual objects demo.

…e instruction.

…or instruction.

…ace instruction.

…ion. Attach a wind direction indicator on the left bottom of the window for better visual understanding.

VincentChen1113 added 30 commits April 13, 2026 13:01

Initial project setup
f210446

Update README
cf5992a

Update README
717ff90

Anotation in Mesh.cpp and app.cpp to help understanding the code stru…
3942215
…cture.

Add an interface to reuse the function for handling mouse draging in …
7bbf617
…both system. Applied mouse drag point as a fixed point for pdb system.

Add comments to explain the solver and update README by adding runnin…
2c865a8
…g section.

Change bend collision handling from distance projection to using pape…
b3ea7f4
…r's dihedral angle constraint projection. The projection procedures followed the formulation in the paper's appendix B.

Implemnet self collision base on the paper's approach. Need to tune t…
5846c6a
…he constraint variables to achieve a better visual result

Fixed for pushing an not compiling code for self-collision
0e1eba5

Improve PBD self-collision with previous-frame normal orientation, cr…
0d04232
…ossing/thickness-band filtering, and tuned thickness/contact limits.

Tuning the variable to achieve a better visual result for demo.
b7aa9a0

Improve PBD floor demo tuning, add floor scene, and add self-collisio…
ea4d533
…n debug counters

Reorganize the structure of the code and add a checklist to the README.
6c79b4a

Resolve the over-constraint's issue by loweringthe maxSelfCollisionCo…
9039d06
…ntactsPerVertex to 4.

Implement a simple mimic wind demo. This demo apply external force wi…
deda0dc
…nd to the botom half of the cloth.

Improve sphere collision handling and render sphere demo object.
6613bcc

Add dual obstacle PBD demo with analytic cube collisions and floor sh…
3ed5829
…ading.

Replace mock wind demo with wind drag force + noise.
8a33b4c

Update README for wind demo.
8b0d9ee

Add lift force as one of the external forces and apply a US flag text…
7b6e3b5
…ure to the wind demo.

Constrain user's mouse drag motion to prevent extreme movement. Updat…
ed1bd1d
…e README to include dropping on dual objects demo.

Add runtime interface for hang demo and update README.
373bd9e

Add interface for drop on sphere demo, and update README for interfac…
684626e
…e instruction.

Add interface for self-collision drop-floor demo, and update README f…
4ca22de
…or instruction.

Add interface for drop dual object demo, and update README for interf…
71a72a1
…ace instruction.

Add interface for wind demo, and update README for interface instruct…
1cccfd2
…ion. Attach a wind direction indicator on the left bottom of the window for better visual understanding.

Reorganize the app file and add demo record into README.
984ea35

Missing check for Demo video / GIF in README.
c533989

Update README
d803525