Help for OBJ2GLTF

PURPOSE:
Convert a .obj mesh file to a .gltf/.glb (GL Transmission Format) file.

EXECUTION:

   obj2gltf INP=mesh.obj OUT=mesh.gltf

   or 

   obj2gltf INP=mesh.obj OUT=mesh.glb

METHOD:

This program takes an .obj mesh file, and optional material .mtl file, 
and converts them to a GLTF or GLB an opensource mesh file format 
(https://www.khronos.org/gltf/).

The full feature set here is narrowly implemented for the use case at a hand: a mesh
with 3D vertex positions and a single texture coordinate. Intended to be paired with 
a single unlit textured material. It can be extended to support more of the full spec
as needed.
      
HISTORY:
2021-04-05  Initial delivery
COGNIZANT PROGRAMMER: Bob Crocco

PARAMETERS: