Autogenerate .reality from glb, not usdz

[GianiNavette]

It would be cool to be able to have .reality files.
One key point is anchor placement.

• in a reality file you can specify the anchor, which is impossible with usdz.

Would be possible to reverse engineer .reality files.
I'll be happy to help, i own a mac and can provide any type of file you want.

[elalish]

PRs welcome if you'd like to create a .reality exporter/converter! Meanwhile, if you already created a .reality file, you can set that as the ios-src and it will work as expected on iOS QuickLook.

[GianiNavette]

PRs welcome if you'd like to create a .reality exporter/converter! Meanwhile, if you already created a .reality file, you can set that as the ios-src and it will work as expected on iOS QuickLook.

Yes would love to contribule, I do know about the use of ios-src, but i would like to be able to autogenerate it from glb/gltf files, do you have any insight about reverse engineer .reality files, i already unzipped an .reality files but there was lot of information to digest, do you know how three js community found a way to do it with usdz ?
Thanks 👍

[elalish]

Three js did it with lots of hard work reading and understanding those files. Here's the docs on ios-src (which does handle both .reality and .usdz) https://modelviewer.dev/docs/#entrydocs-augmentedreality-attributes-iosSrc

I'm not sure if auto-conversion is really what you want; where would you get the AR anchor info from? It's not part of the glTF. Unless I misunderstand...

[GianiNavette]

Three js did it with lots of hard work reading and understanding those files. Here's the docs on ios-src (which does handle both .reality and .usdz) https://modelviewer.dev/docs/#entrydocs-augmentedreality-attributes-iosSrc

I'm not sure if auto-conversion is really what you want; where would you get the AR anchor info from? It's not part of the glTF. Unless I misunderstand...

I saw that inside the file ar.ts, ar-placement="wall" has no impact on the usdz generation.

   if (srcUrl.hash) {
          modelUrl.hash = srcUrl.hash;
        }
      }

      if (this.arScale === 'fixed') {
        if (modelUrl.hash) {
          modelUrl.hash += '&';
        }
        modelUrl.hash += 'allowsContentScaling=0';
      }

So i did my dinging and I saw in Apple docs there was no way to choose the anchor of the usdz only an reality file would allow that.

I think creating an exporter from glb to .reality would allow the use of anchor placement present in reality composer

as this image show what anchor exist on ios.