Material ids were not assigned to faces if the first face with this material was in another thread buffer than where the usemtl command was
Material ids were not assigned to faces if the
first face with this material was in another thread buffer than where
the usemtl command was

syoyo/tinyobjloader,syoyo/tinyobjloader,syoyo/tinyobjloader,syoyo/tinyobjloader