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);
t
