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118 lines
2.7 KiB
Markdown
118 lines
2.7 KiB
Markdown
---
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language: openscad
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filename: learnopenscad.scad
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contributors:
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- ["Tom Preston", "https://github.com/tompreston/"]
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---
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Draw 3D models with code using [OpenSCAD](https://openscad.org/).
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```
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// Comments look like this
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// 3D Primitives
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cube(10);
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cube([5, 10, 20]);
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sphere(10);
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// Transformations
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translate([20, 0, 0]) cube(10);
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rotate([0, 20, 30]) cube(10);
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translate([20, 0, 0]) rotate([0, 20, 30]) cube(10);
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rotate([0, 20, 30]) translate([20, 0, 0]) cube(10);
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// Modifiers
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//
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// * disable
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// ! show only
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// # highlight / debug
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// % transparent / background
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//
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// For example, show only the rotated cube at the origin, before we translate it.
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translate([20, 0, 0]) !rotate([0, 20, 30]) cube(10);
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// Formatting
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// The following models are the same. The official docs prefer the second.
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rotate([0, 20, 30]) translate([20, 0, 0]) cube(10);
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rotate([0, 20, 30])
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translate([20, 0, 0])
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cube(10);
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rotate([0, 20, 30]) {
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translate([20, 0, 0]) {
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cube(10);
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}
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}
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// Loops
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num_cubes = 5;
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r = 20;
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cube_len = 5;
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for (i = [0:num_cubes]) {
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echo(str("Plot cube ", i));
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rotate([0, i * 360 / num_cubes, 0])
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translate([r, 0, 0])
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cube(cube_len, center=true);
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}
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// Boolean operations
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//
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// union() - the sum of both shapes
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// difference() - the first shape, minus the second shape
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// intersection() - only parts of both shapes which intersect
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//
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cube_l = 20;
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cube_w = 10;
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cube_h = 10;
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hole_pos_l = 10;
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hole_pos_h = 5;
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hole_r = 3;
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difference() {
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cube([cube_l, cube_w, cube_h]);
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translate([hole_pos_l, 0, hole_pos_h])
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rotate([-90, 0, 0])
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cylinder(cube_w, r=hole_r);
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}
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// Functions calculate values
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function inch2mm(i) = i * 25.4;
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cube(inch2mm(2));
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// Modules create objects you want to use later
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module house(roof="flat", paint=[1,0,0]) {
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color(paint)
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if (roof=="flat") {
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translate([0,-1,0]) cube();
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} else if (roof=="pitched") {
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rotate([90,0,0])
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linear_extrude(height=1)
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polygon(points=[[0,0],[0,1],[0.5,1.5],[1,1],[1,0]]);
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}
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else if (roof=="domical") {
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translate([0,-1,0]) {
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translate([0.5,0.5,1])
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sphere(r=0.5,$fn=20);
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cube();
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}
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}
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}
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house("pitched");
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translate([2, 0, 0]) house("domical");
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// Import modules and function from other files
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include <filename> // Import the content of the file as if they were written in this file
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use <filename> // Import modules and functions, but do not execute any commands
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```
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## Further Reading
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* Official docs https://openscad.org/documentation.html
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* Cheat sheet https://openscad.org/cheatsheet/index.html
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* Vim bindings https://github.com/sirtaj/vim-openscad
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