OBJ模型的加载绘制放大缩小移动

[{"title":"（ 146 个子文件 3.3MB ） OBJ模型的加载绘制放大缩小移动","children":[{"title":"4.obj <span style='color:#111;'> 6.48MB </span>","children":null,"spread":false},{"title":"7.obj <span style='color:#111;'> 420.53KB </span>","children":null,"spread":false},{"title":"try.obj <span style='color:#111;'> 226.08KB </span>","children":null,"spread":false},{"title":"5.obj <span style='color:#111;'> 6.43MB </span>","children":null,"spread":false},{"title":"6.obj <span style='color:#111;'> 441.58KB </span>","children":null,"spread":false},{"title":"......","children":null,"spread":false},{"title":"<span style='color:steelblue;'>文件过多，未全部展示</span>","children":null,"spread":false}],"spread":true}]