SketchUP 是一個從 google download 的一個免費程式，容易掌握，我用它完成了一些立体模型，選擇了一些角度，再輸出插圖，請多指教！





( SketchUp is a free programme which can be downloaded from Google. It is easy to grasp. I have used it to complete some models and produced pictures from different angles. Grateful for any comments and advice. )



