Switched back to Assimp (Open Asset Importer) since post processing

can be done on meshes beforehand, merge identical vertices, cleaner
triangulation, removed tiny_obj_loader. replace screenshots with new
ones using new faces loaded by Assimp as well as cleaner normals. ssao
set to 16 samples and bloom set to kernel size 3 . added extra texture
unit to mesh if needed,  (although no texture coords generated), created
assimptovtkpolydata method, get bounding box methods to get scene
bounding box and reset camera once.  trying to get fill holes filter to
work but memory leaks.