donmccurdy
commented
3 years ago Cannon.js itself does not know about any part of three.js — it can be used with both three.js and babylon.js, it's up to the user to create CANNON.Shape objects from whatever graphics library you happen to be using. In the case of three.js, that conversion is handled by the three-to-cannon project. Inspecting the compiled source code of A-Frame Physics System...
https://unpkg.com/aframe-physics-system@4.0.1/dist/aframe-physics-system.js
... it looks like nearly all (and perhaps all?) of the references to THREE.Geometry are coming from the three-to-cannon library. This might explain why you don't see these references in GitHub — GitHub searches the local source code, but not the dependencies that eventually get bundled into the published build. I'm working on updating three-to-cannon so that it does not rely on THREE.Geometry, you can track that progress in https://github.com/donmccurdy/three-to-cannon/issues/36. Once v4 of three-to-cannon is published, I'd recommend upgrading the version used here and confirming that things work as expected.
On the other hand, conversion of three.js objects to Ammo.js bodies is handled by the three-to-ammo package. I don't maintain that package, but it appears to work fine with both Geometry and BufferGeometry types already, and so it might not need any changes.
arpu
Our version of Cannon calls depreciated THREE.Geometry 14 times. Originally when I searched the Aframe Physics System I found almost no instance of THREE.Geometry inside this repo. It turns out that searching github does not find everything that is in your code. Do not rely on github searches. If you visit this CDN file and search for "THREE.Geometry" it comes up 14 times in areas that refer to Cannon. This means that until we get this fixed Cannon is not going to work in the Aframe Physics System. If you were thinking about going with Ammo anyways today would be a good day to go that direction. I am going to try to fix our implementation of Cannon by using BufferGeometry, but I am not an expert, and fixing this may take a while, so if you folks can look at this code below and help me identify all the things that need to be changed that would help, and if you can help me figure how to make the right changes that is even better, and if you wish also you may skip the dialog with me and just submit a PR yourself to try to fix some of these things that need fixing. Go for it in the last case. https://cdn.jsdelivr.net/gh/n5ro/aframe-physics-system@v4.0.1/dist/aframe-physics-system.js