Ammo Physics (3D Physics Extension)

[Brackets-Coder]

Ammo Physics

A physics extension based on the ammo.js physics library, which is a direct port of the world-renowned C++ Bullet Physics SDK.

The goal is to provide feature-complete, advanced, and performant 3D physics in a simple-to-understand manner. This extension aims to be consistent with Box2D and Simple3D.

video.mp4

Task list:

• Shapes
  • Boxes
  • Spheres
  • Cylinders
  • Cones
  • Capsules
  • Convex Hulls
  • Triangle Meshes
  • Compound bodies
  • There are some others (planes, heightfields), but I don't want to support these
• Physical Materials (friction, restitution, etc.)
• [ ] Constraints (All types)
• Collision:
  • Collision Detection
  • Raycasting
  • Enable/disable collision response
• Manual Impact forces (like "push with force" block in Box2D)
• Bug fixing

Things I'm considering now or for a later update:

• Vehicle support
• Debug rendering support
• Soft Bodies

Miscellaneous Notes Mainly for Moderators:

• ChatGPT was used to assist and enhance the making of this extension, simply because I couldn't find good quality, coherent documentation of Ammo.js, and attempting to figure out how to use it via the developer inspector isn't fun. It did not write the code for me and I am still the main author of this extension. It just helped me learn Ammo.js. Hope this doesn't cause conflicts.
• I'm not good at graphic design so if someone wants to make a banner/thumbnail that'd be great
• Still have to incorporate Scratch.Cast where necessary, right now I'm just working on functionality though

Put an emoji (👍, 🚀) if you like this extension

[WAYLIVES]

Wow! It's very cool and useful for people like me)

[Brackets-Coder]

Wow! It's very cool and useful for people like me)

Thank you! I've been making steady progress, but it probably won't be ready for a while (which is why this is a draft).

[Brackets-Coder]

Added partial support compound bodies - all child shape types.
Also working on convex and concave mesh support... it'll be a while.

[WAYLIVES]

wow

[Brackets-Coder]

Finally got convex hulls working 🥳 🎉

video.mp4

Still have to optimize and bug fix everything and add more features

[Brackets-Coder]

@GarboMuffin and/or @CubesterYT after merging upstream I'm getting this error when doing npm run dev EDIT: the same issue is happening for validate too
Anyone have any idea what's going on

[Brackets-Coder]

Oops meshes being weird

[Brackets-Coder]

video.mov

Yeah I think it's working

[Brackets-Coder]

Hey, why isnt there any bounce?

That's an issue discussed in the documentation; you have to set restitution for both bodies (e.g., the reactor and the reactant).

Also why does "mass" not do anything?

Mass does do something. According to the rules of gravity, objects with more mass don't accelerate more quickly than those with lesser mass, so you might not see the effect in smaller scenes. Setting mass to 0 will make your body static, and the more mass a body is the "harder" it is to push (either with manual forces or those applied from other bodies interacting) (e.g., a force of 1 newton on a 0.1kg box will make the box go flying, but a force of 1 newton on a 50kg box might only move it a fraction of a meter)

[wiktorlaskowski]

@wiktorlaskowski and @WAYLIVES might want to take a look at the placeholder banner and see if it's acceptable

I?!

[Brackets-Coder]

@wiktorlaskowski and @WAYLIVES might want to take a look at the placeholder banner and see if it's acceptable

I?!

Not sure what you mean by this

[Brackets-Coder]

@MasterThomas15 Your forces should be fixed in the latest commit, and I added a few new simulation utilities (get gravity/maxsubsteps and step simulation with user-provided parameters)

[Brackets-Coder]

The previous commit uses the new ESM stuff to do Scratch.external importing instead of pasting the entire libraries, this reduces the file size by like 89% (1000KB —> 108 KB) and makes it much easier to read

Tradeoff is that it doesn't seem to work in my version of the Desktop editor, which I don't think has been updated yet?

[Brackets-Coder]

@wiktorlaskowski and @WAYLIVES might want to take a look at the placeholder banner and see if it's acceptable

I?!

Not sure what you mean by this

I mean I will need to figure this out? Hint, no I don't even know JS I just use AI for everything for now. Well apart from thumbnails for those extensions, I made them myself.

I just want to know if you think the banner I made is okay, I don't need you to review the extension it's alright

Oh I can make a thumbnail for your extension!

Alright bet thx so much