Search found 10 matches
- Wed Jan 12, 2022 6:38 am
- Forum: Research and development discussion about Collision Detection and Physics Simulation
- Topic: XPBD rigid-body simulation with hard penetration constraints
- Replies: 4
- Views: 35548
Re: XPBD rigid-body simulation with hard penetration constraints
Nice demo. Always nice to be able to just click a link and see something running in the browser. I reckon you'll figure it out if you just keep at it. Again, bugs like this could be a million different things, so it would be hard to diagnose remotely. But because apparently I like making random unif...
- Wed Dec 29, 2021 1:50 am
- Forum: Research and development discussion about Collision Detection and Physics Simulation
- Topic: Small Step XPBD FEM Demo
- Replies: 6
- Views: 35623
Re: Small Step XPBD FEM Demo
Updated the demo. The current version is still at https://jak-xyz.github.io/xpbd-fem, and the previous version is now at https://jak-xyz.github.io/xpbd-fem/v4. This update is a bit different in nature compared to the previous ones, as I added very few features to the main sim. Instead, I added two n...
- Tue Dec 07, 2021 10:30 pm
- Forum: Research and development discussion about Collision Detection and Physics Simulation
- Topic: XPBD rigid-body simulation with hard penetration constraints
- Replies: 4
- Views: 35548
Re: XPBD rigid-body simulation with hard penetration constraints
Hard to say from just the video, so this probably won't be accurate, but maybe it'll still help in a rubber-ducking kind of way. The first thing it makes me think is that somewhere in your velocity/restitution code you're using full Δt instead of the substep Δt. You could try turning off restitution...
- Mon Nov 08, 2021 12:03 am
- Forum: Research and development discussion about Collision Detection and Physics Simulation
- Topic: Small Step XPBD FEM Demo
- Replies: 6
- Views: 35623
Re: Small Step XPBD FEM Demo
Love it! That GPU sim is so smooth ~~
Great to see other people working in the area!
Great to see other people working in the area!
- Sat Nov 06, 2021 6:31 am
- Forum: Research and development discussion about Collision Detection and Physics Simulation
- Topic: Small Step XPBD FEM Demo
- Replies: 6
- Views: 35623
Re: Small Step XPBD FEM Demo
Updated the demo. The current version is still at https://jak-xyz.github.io/xpbd-fem, and the previous version is now at https://jak-xyz.github.io/xpbd-fem/v3. Additionally, I uploaded the latest code to: https://github.com/jak-xyz/xpbd-fem. Changelog: Rayleigh Damping Took a deeper dive into the Ra...
- Fri Oct 08, 2021 11:15 am
- Forum: Research and development discussion about Collision Detection and Physics Simulation
- Topic: Small Step XPBD FEM Demo
- Replies: 6
- Views: 35623
Re: Small Step XPBD FEM Demo
The excellent paper Miles Macklin posted yesterday ( A Constraint-based Formulation of Stable Neo-Hookean Materials ) elucidated some things about the relationship between constraints and energy in XPBD that I had been fuzzy on, and I couldn't resist jamming the corrected mixed Neo-Hookean energy fu...
- Thu Oct 07, 2021 4:58 am
- Forum: Research and development discussion about Collision Detection and Physics Simulation
- Topic: Small Step XPBD FEM Demo
- Replies: 6
- Views: 35623
Re: Small Step XPBD FEM Demo
Found a sudden burst of inspiration to post an update to the demo ;p. The 3 major additions are a few new element types (second-order triangles and first- and second-order tetrahedrons), Stanford armadillo meshes for each of the element types, and a new set of energy functions that constrain per-ver...
- Sun Aug 29, 2021 6:00 pm
- Forum: Research and development discussion about Collision Detection and Physics Simulation
- Topic: Small Step XPBD FEM Demo
- Replies: 6
- Views: 35623
Small Step XPBD FEM Demo
Hi guys, I've been working on a small step XPBD-based implementation of FEM off and on for the last several months, and I think I finally have something that someone might find interesting. Here's a WASM demo showing the current state of things: https://jak-xyz.github.io/xpbd-fem/. At some point I h...
- Fri Jul 09, 2021 11:52 pm
- Forum: Research and development discussion about Collision Detection and Physics Simulation
- Topic: Damping in XPBD
- Replies: 3
- Views: 34321
Re: Damping in XPBD
Your code certainly looks correct on first glance, though I didn't try to run it, so who knows. I would expect it has more to do with getting everything else set up perfectly to make Rayleigh damping "happy". I was thinking of doing a post on what I've got so far in a little bit, and I was...
- Tue Jul 06, 2021 11:37 pm
- Forum: Research and development discussion about Collision Detection and Physics Simulation
- Topic: Damping in XPBD
- Replies: 3
- Views: 34321
Re: Damping in XPBD
I realize this question is over a year old (so I hope OP was able to figure something out!), but it still comes up on google and it got me doubting the suggested Rayleigh damping from the XPBD paper for use with incompressible FEM. However, after quite a few pitfalls along the way, I finally got it ...