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Charles Iliya Krempeaux 2024-01-14 14:26:01 -08:00
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@ -74,6 +74,82 @@ for (a =[x1,x2,x3]){echo(a);}
And it is a good idea to explicitly size your model when preparing it for 3D-printing.
</p>
</section>
<section>
<h2>Cuboids</h2>
<p>
One basic 3D shape that <strong>OpenSCAD</strong> provides built-in support for is the <strong>cuboid</strong>.
</p>
<p>
To create a <strong>cuboid</strong> use the <code>cube</code> command.
For example:
</p>
<figure>
<pre><code>
cube([50,75,100]);
</code></pre>
</figure>
<p>
The parameter to the <code>cube</code> command specifies the <em>width</em>, <em>length</em>, and <em>height</em> of the <strong>cuboid</strong>.
Note that the <code>cube</code> command will put one corner of the <strong>cuboid</strong> at the origin — <code>[0,0,0]</code>.
</p>
</section>
<section>
<h2>Spheres</h2>
<p>
Another basic 3D shape that <strong>OpenSCAD</strong> provides built-in support for is the <strong>sphere</strong>.
</p>
<p>
To create a <strong>sphere</strong> use the <code>sphere</code> command.
For example:
</p>
<pre><code>
sphere(20);
</code></pre>
<p>
The paraemter to the <code>sphere<code> command specifies the <em>radius</em> of the <strong>sphere</strong>.
Note that the <code>sphere<code> command will put the center of the <strong>sphere</strong> at the origin — <code>[0,0,0]</code>.
</p>
</section>
<section>
<h2>Cylinders, Cones, and Truncated Cones</h2>
<p>
Three other basic 3D shape that <strong>OpenSCAD</strong> provides built-in support for is the <strong>cylinder</strong>, the <strong>cone</strong>, and the <strong>truncated cone</strong>.
</p>
<p>
To create a <strong>cylinder</strong>, <strong>cone</strong>, or <strong>truncated cone</strong> use the <code>cylinder</code> command.
For example, this is a <strong>cylinder</strong>:
</p>
<pre><code>
cylinder(h=50, r1=20, r2=20);
</code></pre>
<p>
Note that <code>r1</code> and <code>r2</code> have the same value.
When <code>r1</code> and <code>r2</code> have the same value, you get a <strong>cylinder</strong> (rathe than a <strong>cone</strong> or a strong>truncated cone</strong>).
</p>
<p>
And, for example, this is a <strong>cone</strong>:
</p>
<pre><code>
cylinder(h=50, r1=20, r2=0);
</code></pre>
<p>
In that example, <code>r2</code> is zero.
But having <code>r1</code> be zero (and <code>r2</code> not be zero) would also produce a <strong>cone</strong>.
</p>
<p>
And, for example, this is a <strong>truncated cone</strong>:
</p>
<pre><code>
cylinder(h=50, r1=20, r2=5);
</code></pre>
<p>
In that example, <code>r2</code> is smaller than <code>r1</code> (and neither is zero).
But having <code>r1</code> be smaller than <code>r2</code> would also be a <strong>truncated cone</strong>.
</p>
<p>
Note that the <code>cylinder<code> command will put the center of one end of the bottom circle at the origin — <code>[0,0,0]</code>.
</p>
</section>
</article>
</main>
</body>