How to use cannon hook with instanced mesh?

[bhushan6]

I found this example on react three cannon's github, but Idk how can I position meshes at particular position the way we position instanced meshes using loop and passing setMatrixAt with different index method.

[drcmda]

the box you linked seems to answer it, no? like you said, it calls setMatrixAt and that's how you position items.

[bhushan6]

idk how to use setMatrixAt with cannon hook, i have tried several ways of doing it but nothing is working.

[drcmda]

when you use cannon you explicitely give full control to it, cannon is what will position objects according to its physics world. if you set position by mutating the object it will be immediately overwritten. in other words you can't use setMatrixAt.

you normally control an object by force or impulses, or by telling cannon the position, see: https://twitter.com/0xca0a/status/1414971353766240261

const [ref, api] => use...
useEffect(() => {
  api.at(index).position.set(1,2,3)

[bhushan6]

Oh I was just doing api.position.set(x, y, z)
Cool and there is anyway to scale every mesh to different size? because we can do that in instanced mesh by scaling the dummy object 3d but i do not see scale method in api.

[drcmda]

there was an open issue for this on use-cannon and i think its not currently possible. could you look into that and make a quick pr? i dont have time right now unfortunately.