BEPUphysics
JoltPhysics
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BEPUphysics | JoltPhysics | |
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5 | 26 | |
2,149 | 5,523 | |
3.2% | - | |
8.9 | 9.6 | |
4 days ago | 2 days ago | |
C# | C++ | |
Apache License 2.0 | MIT License |
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
BEPUphysics
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Current state of 2D game code-first frameworks?
The best pure-C# physics library (hands-down) is bepuphysics2, which unfortunately is mainly a 3D physics library, but could be used for 2D if you wanted to get your hands dirty.
- Physics Engine
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Open Source C++ Physics Libraries for Dedicated FPS Server?
Bepu Physics is pretty good and is written in really optimized C#, the author's blog post are really interesting to read.
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GJK: Collision detection algorithm in 2D/3D
The usual approach is some form of sweep to get a time of impact. Once you've got a time of impact, you can either generate contacts, or avoid integrating the involved bodies beyond the time of impact, or do something fancier like adaptively stepping the simulation to ensure no lost time.
If the details don't matter much, it's common to use a simple ray cast from the center at t0 to the center at t1. Works reasonably well for fast moving objects that are at least kinda-sorta rotationally invariant. For two dynamic bodies flying at each other, you can test this "movement ray" of body A against the geometry of body B, and the movement ray of body B against the geometry of body A.
One step up would be to use sphere sweeps. Sphere sweeps tend to be pretty fast; they're often only slightly more complicated than a ray test. Pick a sphere radius such that it mostly fills up the shape and then do the same thing as in the previous ray case.
If you need more detail, you can use a linear sweep. A linear sweep ignores angular velocity but uses the full shape for testing. Notably, you can use a variant of GJK (or MPR, for that matter) for this: http://dtecta.com/papers/jgt04raycast.pdf
If you want to include angular motion, things get trickier. One pretty brute forceish approach is to use conservative advancement based on distance queries. Based on the velocity and shape properties, you can estimate the maximum approaching velocity between two bodies, query the distance between the bodies (using algorithms like GJK or whatever else), and then step forward in time by distance / maximumApproachingVelocity. With appropriately conservative velocity estimates, this guarantees the body will never miss a collision, but it can also cause very high iteration counts in corner cases.
You can move a lot faster if you allow the search to look forward a bit beyond potential impact times, turning it into more of a root finding operation. Something like this: https://box2d.org/files/ErinCatto_ContinuousCollision_GDC201...
I use a combination of speculative contacts and then linear+angular sweeps where needed to avoid ghost collisions. Speculative contacts can handle many forms of high velocity use cases without sweeps- contact generation just has to be able to output reasonable negative depth (separated) contacts. The solver handles the rest. The sweeps use a sorta-kinda rootfinder like the Erin Catto presentation above, backed up by vectorized sampling of distance. A bit more here, though it's mainly written for users of the library: https://github.com/bepu/bepuphysics2/blob/master/Documentati...
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Early Demo of Dynamic Blocky Lighting System
I use https://github.com/bepu/bepuphysics2. I haven't worked with 3d physics engines before so I can't really comment on it's quality but it is definitely an impressive project! The developer is very active and helpful and some of the demo scenes are pretty large and complex.
JoltPhysics
- Simulation Islands
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Bevy XPBD: A physics engine for the Bevy game engine
There is now also https://github.com/jrouwe/JoltPhysics which is used in Horizon Forbidden West.
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Has anyone used Jolt physics engine?
Apparenty, this is a game engine used by Horizon Forbidden West and I was curious what you all think about this project: https://github.com/jrouwe/JoltPhysics
- After months of work, I'm excited to share the first release of Godot Jolt, an extension that integrates the Jolt physics engine into Godot, demonstrated using GDQuest's RoboBlast
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Rust – Are We Game Yet?
As far as physics engines go: Jolt currently seems to kinda disrupt the decade-long equilibrium, at least as far as I'm aware:
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X4's Upcoming Multiplayer Features Are a Huge Step Forward
No, they replaced Bullet with Jolt. That is considerably more than "some adjustment", regardless of what you think of the result.
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Oof. 7fps for an incredibly simple rocket that is well under 100 parts.
A multithreaded rigid-body engine for games: https://github.com/jrouwe/JoltPhysics
- zig-gamedev project: zphysics v0.0.4 - Zig API and C API for Jolt Physics
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Godot for AA/AAA game development – What's missing?
Would you rather they use Jolt Physics? https://github.com/jrouwe/JoltPhysics S&box is thinking of using this engine instead of Source 2's Rubicon. As they say, maybe someone could / would hook up Jolt as a GDExtension.
- Where and how can I learn to make simulation programs? I like to be a simulation developer!
What are some alternatives?
Stride Game Engine - Stride Game Engine (formerly Xenko)
tinyphysicsengine
MonoGame - One framework for creating powerful cross-platform games.
Bullet - Bullet Physics SDK: real-time collision detection and multi-physics simulation for VR, games, visual effects, robotics, machine learning etc.
Xenko
godot-jolt - Godot Jolt is a Godot extension that integrates the Jolt physics engine
Nez - Nez is a free 2D focused framework that works with MonoGame and FNA
small3dlib
osu-framework - A game framework written with osu! in mind.
rapier - 2D and 3D physics engines focused on performance.
CocosSharp - CocosSharp is a C# implementation of the Cocos2D and Cocos3D APIs that runs on any platform where MonoGame runs.
PhysX - NVIDIA PhysX SDK