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                ![](http://www.rhinostudio.cn/files/course/2019/05-05/11431202230e114513.png) ## **Planar** 判斷曲線是否為平面曲線。輸出布爾值以及平面所在工作平面,以及曲線平面偏差值,而所謂曲線平面偏差值就是描述曲線有多不平。越不平,值越大,平面曲線,值為0。
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