Philip Rideout b3dce967eb Rollback MeshAssimp enhancements. ...

This caused regressions with some of our samples like vk_hellopbr:

- For the new 1x1 textures, RGB isn't accepted by Vulkan and Metal.
  Currently these platforms require RGBA, although we plan on adding
  reshaping functionality for the future.
- Too many texture samplers in a single shader, this causes a run time
  error. This could be alleviated by creating an atlas.
- vk_hellopbr assumes that all materials have a "metallic" param.

Going forward, we plan on creating a new library that avoids MeshAssimp,
so for now let's just disable gltf_viewer.

2018-11-19 14:18:12 -08:00

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