Obj parser is not successfully assigning materials

[TrabacchinLuigi]

Obj parser is assigning the material in a wrong way, it is meant to be a state machine and start with the default material, and all subsequent geometries should have the last selected material

[stoneflyop1]

Hi,
When a usemtl appears, a face is created and the current material is attached to the face. I think the result is the same as you describe. Thanks.

[TrabacchinLuigi]

absolutely not.
usemtl defines the material that will be used subsequently from that moment onward, the result was totally wrong. if no material is provided a default white material is used.
Same here, i've already fixed this, have a look at my fork!