# Objective
The gltf-json crate seems like it strips/adds an `_` when doing the name
comparison for custom vertex attributes.
* gltf-json
[add](88e719d5de/gltf-json/src/mesh.rs (L341))
* gltf-json
[strip](88e719d5de/gltf-json/src/mesh.rs (L298C12-L298C42))
* [bevy's
handling](b66c3ceb0e/crates/bevy_gltf/src/vertex_attributes.rs (L273-L276))
seems like it uses the non-underscore'd version.
The bevy example gltf:
[barycentric.gltf](b66c3ceb0e/assets/models/barycentric/barycentric.gltf),
includes two underscores: `__BARYCENTRIC` in the gltf file, resulting in
needing `_BARYCENTRIC` (one underscore) as the attribute name in Bevy.
This extra underscore is redundant and does not appear if exporting from
blender, which only requires a single underscore to trigger the
attribute export.
I'm not sure if we want to change the example itself (maybe there's a
reason it has two underscores, I couldn't find a reason), but a docs
comment would help.
## Solution
add docs detailing the behavior
1dd30a620a