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这篇文章主要介绍“怎么用OpenSCAD创建螺旋形结构物体”,在日常操作中,相信很多人在怎么用OpenSCAD创建螺旋形结构物体问题上存在疑惑,小编查阅了各式资料,整理出简单好用的操作方法,希望对大家解答”怎么用OpenSCAD创建螺旋形结构物体”的疑惑有所帮助!接下来,请跟着小编一起来学习吧!
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OpenSCAD不仅可以快速创建立方体、圆锥体、球体、椭球体、多边形体等,还可以通过编程、循环等特性来创建螺旋体,如常见的螺栓、螺孔等,如下图所示:
下面给出建模的代码:
module screw(type = 2, r1 = 15, r2 = 20, n = 7, h = 100, t = 8) { linear_extrude(height = h, twist = 360*t/n, convexity = t) difference() { circle(r2); for (i = [0:n-1]) { if (type == 1) rotate(i*360/n) polygon([ [ 2*r2, 0 ], [ r2, 0 ], [ r1*cos(180/n), r1*sin(180/n) ], [ r2*cos(360/n), r2*sin(360/n) ], [ 2*r2*cos(360/n), 2*r2*sin(360/n) ], ]); if (type == 2) rotate(i*360/n) polygon([ [ 2*r2, 0 ], [ r2, 0 ], [ r1*cos(90/n), r1*sin(90/n) ], [ r1*cos(180/n), r1*sin(180/n) ], [ r2*cos(270/n), r2*sin(270/n) ], [ 2*r2*cos(270/n), 2*r2*sin(270/n) ], ]); } } } module nut(type = 2, r1 = 16, r2 = 21, r3 = 30, s = 6, n = 7, h = 100/5, t = 8/5) { difference() { cylinder($fn = s, r = r3, h = h); translate([ 0, 0, -h/2 ]) screw(type, r1, r2, n, h*2, t*2); } } module spring(r1 = 100, r2 = 10, h = 100, hr = 12) { stepsize = 1/16; module segment(i1, i2) { alpha1 = i1 * 360*r2/hr; alpha2 = i2 * 360*r2/hr; len1 = sin(acos(i1*2-1))*r2; len2 = sin(acos(i2*2-1))*r2; if (len1 < 0.01) polygon([ [ cos(alpha1)*r1, sin(alpha1)*r1 ], [ cos(alpha2)*(r1-len2), sin(alpha2)*(r1-len2) ], [ cos(alpha2)*(r1+len2), sin(alpha2)*(r1+len2) ] ]); if (len2 < 0.01) polygon([ [ cos(alpha1)*(r1+len1), sin(alpha1)*(r1+len1) ], [ cos(alpha1)*(r1-len1), sin(alpha1)*(r1-len1) ], [ cos(alpha2)*r1, sin(alpha2)*r1 ], ]); if (len1 >= 0.01 && len2 >= 0.01) polygon([ [ cos(alpha1)*(r1+len1), sin(alpha1)*(r1+len1) ], [ cos(alpha1)*(r1-len1), sin(alpha1)*(r1-len1) ], [ cos(alpha2)*(r1-len2), sin(alpha2)*(r1-len2) ], [ cos(alpha2)*(r1+len2), sin(alpha2)*(r1+len2) ] ]); } linear_extrude(height = 100, twist = 180*h/hr, $fn = (hr/r2)/stepsize, convexity = 5) { for (i = [ stepsize : stepsize : 1+stepsize/2 ]) segment(i-stepsize, min(i, 1)); } } translate([ -30, 0, 0 ]) screw(); translate([ 30, 0, 0 ]) nut(); spring();
上面的几何体生成代码使用了module来进行几何对象的封装,这是新的OpenSCAD非常有用的一个特征。可以把零部件定义为一个Module,然后在使用时重复引用即可,非常便于创建具有大量的规则几何形状的物体。
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