SketchUp5.0.260(带卫老师教学视频) 动画原理 漫游 动画实例1-阴影 动画实例2-建筑漫游 插件的安装等-SketchUp5.0.260 (with Wei teaching video) Animation Animation examples of the principle of roaming 1- shadow animation Example 2- Building the installation of plug-ins, such as ro