CesiumGS / CesiumGS/obj2gltf

Holes in mesh

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Description

Creating glb with obj2gltf results in a mesh with holes (see photo below, in model-viewer).

Obj looks fine in 3D editting software. Two tricks solved the problem:
1. Setting hard edges before glb creation
2. Creating glb with online converters

The problem persisted in multiple viewers.

Any thoughts on what is going wrong?

![C290E976-42A5-46FF-9569-490175B6E773](https://user-images.githubusercontent.com/45426768/112699665-a33a3a80-8e8c-11eb-87a6-44ce5873022a.jpeg)

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