例 { "box": { "sizes": [ [10,10,20] ], "positions": [ [5, 5, 10] ] }, "cylinder": { "sizes": [ [10,20] ], "positions": [ [20, 10, 10] ] }, "tube": { "sizes": [ [4,10,15] ], "positions": [ [35, 7.5, 10] ] } }