Function DecodeFileFS

xyz/io.go:78–122

DecodeFileFS decodes the given file from the given filesystem using a decoder based on the file extension. Returns decoder instance with full decoded state. Supported formats include: .obj = Wavefront OBJ format, including associated materials (.mtl) which must have same name as .obj, or a defaul

(fsys fs.FS, fname string)

//
//	must have same name as .obj, or a default material is used.
func DecodeFileFS(fsys fs.FS, fname string) (Decoder, error) {
	ext := filepath.Ext(fname)
	dt, has := Decoders[ext]
	if !has {
		return nil, fmt.Errorf("xyz.DecodeFile: file extension: %v not found in Decoders list for file %v", ext, fname)
	}
	dec := dt.New()
	fn := fname
	subdir, fn := filepath.Split(fn)
	var err error
	if subdir != "" {
		fsys, err = fs.Sub(fsys, subdir)
		if err != nil {
			return nil, fmt.Errorf("xyz.DecodeFile: file directory not found error: %v for file: %v", err, fname)
		}
	}
	files, err := dec.SetFileFS(fsys, fn)
	if err != nil {
		return nil, fmt.Errorf("xyz.DecodeFile: file not found error: %v for file: %v", err, fname)
	}
	nf := len(files)

	fs := make([]fs.File, nf)
	rs := make([]io.Reader, nf)
	defer func() {
		for _, fi := range fs {
			if fi != nil {
				fi.Close()
			}
		}
	}()

	for i, f := range files {
		fs[i], err = fsys.Open(f)
		if err != nil {
			return nil, err
		}
		rs[i] = fs[i]
	}
	err = dec.Decode(rs)
	if err != nil {
		return nil, err
	}
	return dec, nil
}

// OpenObj opens object(s) from given file into given group in scene,
// using a decoder based on the file extension.