This repository contains some code that was supposed to help me fix my avatar
in [Resonite], which turned out to not be appropriate for public instances.

![output viewed in Blender](docs/blender.png)

Unfortunately I have yet to actually make the round-trip back into Resonite
work properly. Unsure if I'm mapping the bones correctly.

### How it works

Because Resonite does not (yet) allow "skinned" meshes (with bones and weights
and all that stuff) to be exported in a way that keeps the skinning information,
we have to go about it in a more roundabout way:

- Export the model as a Resonite Package, place in `test/Test.resonitepackage`
- Open the package, which is actually just disguised `.zip` archive
- Parse the `R-Main.record` entry, a JSON file
- The `assetUri` field points to the main asset file in the archive
- Parse this file using [BSON], a horrible "Binary JSON" format
- The resulting `DataTree` contains the hierarchical node and component info
- Types are encoded as IDs, which we can decode using a lookup array
- Process supported asset types: Meshes, textures, and materials
- These assets can then be referenced by their ID by other nodes
- Go through all node and attach meshes to them if they have some
- Export the whole thing as `test/scene.glb` with [SharpGLTF]

**NOTE:** It might be possible to parse a good chunk of this with Resonite's
own library, but it probably requires setting up an `Engine` or so for it to
parse all the related files, I don't have the know-how to do that.

**NOTE:** The path to the Resonite libraries is hardcoded in `Res2tf.csproj`
so if you'd like to use this yourself you will have to change this.

[Resonite]: https://resonite.com/
[SharpGLTF]: https://github.com/vpenades/SharpGLTF
[BSON]: https://bsonspec.org/