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                ### 4.3.2立方體 啟動立方體命令后,通過鼠標點擊或者按下tab鍵打開追蹤器輸入的方式指定第一點和對角線上的第二點,確定一個矩形。然后指定出第三點確定出立方體的高度,快速繪制出立方體。在繪制平面矩形時,按下shift鍵,可以切換不同的平面展開方向。處于xy平面時,動態繪制呈現藍色;處于xz平面時,動態繪制呈現綠色;處于yz平面時,動態繪制呈現紅色。繪制完成并選中三維實體,可以使用屬性面板或者夾點對實體進行修改。
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