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                ### 4.3.5推拉 推拉是通過對選擇對象的一個面進行推拉來改變實體的形狀,它是通用建模中重要的造型手段,如圖6.3-1。啟動推拉命令后,選擇要推拉的面:將光標移至要推拉的面上,面被高亮顯示,按左鍵確認。然后沿被推拉面的法向方向移動光標,用戶可觀察到推拉造成的實體變化過程。順著法向方向移動光標,將向前拉面。逆著法向方向移動光標,將向后推拉面。按下shift鍵可以切換成創建新輪廓的模式。通過鼠標點擊或者按下tab鍵打開追蹤器輸入的方式完成推拉操作。 :-: ![](https://img.kancloud.cn/f9/f5/f9f56ee9f1335b86d35d97e60bf26737_301x354.png) :-: 圖4.3.5-1
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