还有一种方式能用到修剪，那就是相交曲面（Intersect Surfaces ）。但有时曲面非常复杂，不像平面简单，投射曲线有时候会变成两节，有时候会变得扭曲，甚至短一节，这时就需要配合其他命令来解...
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Maya动画制作高手之道(附光盘模型卷) ... Edit NURBS>Detach Surfaces(分离曲面) Edit NURBS>InterSect Surfaces(相交曲面) Edit NURBS>Trim Tool(剪切工具) ...
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... project curve on surface在去面上投射曲线 interest sufaces相交曲面 trim tool修建工具 ...
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曲面与曲面相交求曲线 Surf-Surf Intersection Curve ; Surface-Surface Intersection Curve
面面相交曲线 Surface-Surface Intersection Curve
平面与曲面相交曲线 Slice
现在，假设曲面上有两条相交切线，那么这两条切线可以确定一个切平面，我们来看看这个平面是怎么搞出来的。
Now, if I have two lines tangent to the surface, well, then together they determine for me the tangent plane to the surface. Let's try to see how that works.
这样的2维宇宙模型就像是球体，不可能出现平行的测地线(测地线是曲面上的直线)——两直线必然在某点相交。
A two-dimensional model of such a universe would look like a sphere. It's impossible to have parallel geodesics (straight lines on a curved surface) — the two lines will cross at some point.
接下来，我们的任务就是将平面与拼接曲面的有效部分相交所得截线参数化。
Then our task is to parameterize the intersection of and the valid part of for some fixed .
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