Testing various Wafefront .OBJ parsing libraries

tinyobjloader: https://github.com/tinyobjloader/tinyobjloader, 2021 Dec 27 (8322e00a), v1.0.6+. MIT license.
tinyobjloader_opt: using the experimental multi-threaded parser from the above.
fast_obj: https://github.com/thisistherk/fast_obj, 2022 Jan 29 (85778da5), v1.2+. MIT license.
rapidobj: https://github.com/guybrush77/rapidobj, 2022 Jun 18 (0e545f1), v0.9. MIT license.
blender: part of Blender codebase for building just the OBJ parser (tree), 2022 Jun 19, version 3.3.0 alpha. GPL v3 license.
assimp: https://github.com/assimp/assimp, 2022 May 10 (ff43768d), version 5.2.3+. BSD 3-clause license.
osg: part of https://github.com/openscenegraph/OpenSceneGraph code, just the OBJ parser (tree), 2022 Apr 7, v3.6.5+. LGPL-based license.

Feature	tinyobjloader	fast_obj	rapidobj	blender	assimp	osg
Base meshes	✓	✓	✓	✓	✓	✓
Base materials	✓	✓	✓	✓	✓	✓
PBR materials	✓		✓		✓
Vertex colors (xyzrgb)	✓			✓	✓	✓
Vertex colors (MRGB)				✓		✓
Lines (`l`)	✓		✓	✓	✓	✓
Points (`p`)	✓				✓	✓
Curves (`curv`)				✓*
2D Curves (`curv2`)
Surfaces (`surf`)
Skin weights (`vw`)	✓
Subdiv crease tags (`t`)	✓
Line continuations (`\`)				✓	✓	✓
Platform: Windows	✓	✓	✓	✓	✓	✓
Platform: macOS	✓	✓	✓	✓	✓	✓
Platform: Linux	✓	✓	✓	✓	✓	✓

* Blender OBJ parser has limited support for curves: only bspline curve type is supported.

sponza: 20MB, 0.15M verts, 381 objects, 25 materials. "Crytek Sponza" from McGuire Computer Graphics Archive.
Monkey-6: 330MB, 2.0M verts, 1 object, 1 material. Blender's Monkey mesh, subdivided to level 6.
rungholt: 270MB, 2.5M verts, 1 object, 84 materials. "Rungholt" Minecraft map from McGuire Computer Graphics Archive.
Blender3Splash: 2.5GB, 14.4M verts, 24k objects, 113 materials. Blender 3.0 splash scene "Sprite Fright", exported as OBJ.

Windows 10, AMD Ryzen 5950X, VS2022 17.1:

Library	sponza	Monkey-6	rungholt	Blender3Splash
tinyobjloader	0.17	2.75	2.83	19.57
tinyobjloader_opt	0.04	0.41	0.40	3.12
fast_obj	0.04	0.70	0.58	5.16
rapidobj	0.02	0.19	0.19	1.25
blender	0.07	0.94	0.83	6.92
assimp	0.20	2.98	3.88	21.98
osg	0.82	12.88	12.04	96.42

Windows 10, AMD Ryzen 5950X, clang 13:

Library	Monkey-6	rungholt	Blender3Splash
tinyobjloader	2.65	2.42	16.47
tinyobjloader_opt	0.38	0.38	2.69
fast_obj	0.71	0.58	5.25
rapidobj	0.19	0.17	1.62
blender	0.80	0.74	5.98
assimp	2.74	3.53	19.90

macOS 12.3, Apple M1 Max, clang 13:

Library	sponza	Monkey-6	rungholt	Blender3Splash
tinyobjloader	0.14	2.09	2.12	14.72
tinyobjloader_opt	0.03	0.47	0.38	5.07
fast_obj	0.02	0.33	0.30	2.40
rapidobj	0.01	0.10	0.10	0.63
blender		0.73	0.76	5.53
assimp	0.13	1.89	2.17	14.26
osg	0.46	7.04	5.83	53.14

Memory usage in MB (peak/end), Windows/VS2022:

obj_parse_tester
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