怎么用OpenSCAD创建螺旋形结构物体

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！

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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