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                            ![](http://www.rhinostudio.cn/files/course/2019/05-05/15485357b7f9765072.png)

## **Horizontal Frame**

返回曲線指定t值位置的平行于xy平面的平面，這個平面以曲線切線方向為平面x軸。所以可以很容易的做出下面這樣的與曲線相切的截面來做諸如欄桿之類的物件。不過依然需要注意，由于t值和曲線距離沒直接關系，所以等分t值得到的點，并不是等分的

![](http://www.rhinostudio.cn/files/course/2019/05-05/155314aa941d291855.png)

除非你的線是直線，或者控制點均勻，你看我重建曲線之后，等分點就和t值取的點一致了：

![](http://www.rhinostudio.cn/files/course/2019/05-05/1558240e5705778617.png)
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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