obj

type GroupData struct {
	Name     string
	Material string
	SzPos    int       // number components of position per vertex
	SzTC     int       // number components of texcoord per vertex
	SzNorm   int       // number components of nromal per vertex
	Vert     []float32 // interlacing position, texcoord, normal
	Smooth   int       // smoothing group
}

type ModelData struct {
	Name    string
	MtlLibs []string
	Groups  []*GroupData
}