ImplicitCAD是一个开源的可编程的CAD软件。采用Haskell语言开发。
示例代码：
/* This creates a twisted extrusion of 5 unioned circles * with gratuitous amounts of rounding. Try it out! */linear_extrude (height = 40, twist(h) = 35*cos(h*2*pi/60)) union ( r = 8) { circle (10); translate ([22,0]) circle (10); translate ([0,22]) circle (10); translate ([-22,0]) circle (10); translate ([0,-22]) circle (10); }效果图：
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