Tangential, 3D modelling programs have wildly differing ideas of import / export sign & axis conventions. A few small examples...

MMD PMD & PMX files may be exported, un-rigged, as OBJ/MTL from PMX Editor. But you must 'mirror' the model first, as otherwise appears swapped L/R. This may also confuse texturing...

FBX files may import 'on their face' facing 'forwards' or 'right'. This is after you've found an import scaling to get them on screen, of course, of course, ranging from ~0.5% to ~3500%...