hi. i have same problems. bjs works with opengl convention. but when i export models in fbx for substance painter, paint textures and after this steps back to 3ds max and apply textures from substance painter to my materials and with this textures i export to bjs and… get problems with odd inverted green channel… and i catch error… when exporting in fbx with smooth groups. so maybe you have similar problems with smooth groups. try to dont export Smooth groups