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                ![](https://img.kancloud.cn/cf/f2/cff2557c589c219545b703561e9a2ee4_712x609.png) 簡單說,就是因為計算機當中其實沒有百分百的精準。rhino里的公差就是用來控制精度的,計算機的邏輯和人不一樣的,你認為的是原地復制,兩個是一樣的,但是軟件是當做兩個物件來處理,而Nurbs曲線在rhino里是無法做到百分百精準的,那就一定會有誤差。所以,如果你原地復制直線或者圓這樣標準圖形,數學可以完美定義的圖形,就不會存在誤差。 詳細的解釋課一看下鹿神在論壇的回復。 ![](https://img.kancloud.cn/53/56/53563c1ebdb81e0a78692486194aaa97_815x430.png) ![](https://img.kancloud.cn/eb/7f/eb7fa97244573573f0758f76f58d4e9c_831x881.png) ![](https://img.kancloud.cn/8a/e8/8ae8061deca76f4bcffda37ae6a1d883_754x129.png)
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