### Install GHC and cabal on Debian/Ubuntu

Source: https://implicitcad.org/docs/install

Use apt-get to install the necessary Haskell build tools.

```bash
apt-get install ghc cabal-install
```

--------------------------------

### Install GHC and cabal on Archlinux

Source: https://implicitcad.org/docs/install

Use pacman to install the necessary Haskell build tools.

```bash
pacman -S ghc cabal-install
```

--------------------------------

### Install latest ImplicitCAD release

Source: https://implicitcad.org/docs/install

Use cabal to update and install the latest version of ImplicitCAD.

```bash
cabal update && cabal install implicit
```

--------------------------------

### Output of variable reassignment example

Source: https://implicitcad.org/docs/faq

The console output resulting from the variable reassignment loop example.

```text
1.0
5.0
2.0
10.0
3.0
30.0
```

--------------------------------

### Build ImplicitCAD development version

Source: https://implicitcad.org/docs/install

Install dependencies, clone the repository, and build the project.

```bash
cabal update && cabal install hashmap parallel parsec plugins JuicyPixels blaze-builder blaze-markup blaze-svg storable-endian unordered-containers vector-space
```

```bash
git clone https://github.com/colah/ImplicitCAD.git
```

```bash
cd ImplicitCAD/
```

```bash
cabal configure && cabal install
```

--------------------------------

### Install GHC and cabal on Red Hat/Fedora

Source: https://implicitcad.org/docs/install

Use yum to install the necessary Haskell build tools.

```bash
yum install ghc cabal-install
```

--------------------------------

### Install GHC and cabal on Mac OSX via Homebrew

Source: https://implicitcad.org/docs/install

Use Homebrew to install the necessary Haskell build tools.

```bash
brew install ghc cabal-install
```

--------------------------------

### Implicit union behavior

Source: https://implicitcad.org/docs/faq

Example showing that ImplicitCAD does not perform implicit unions, resulting in only the first sphere being rendered.

```text
sphere(10);
translate([20,0,0]) sphere(5);
```

--------------------------------

### Run extopenscad to render STL and view with meshlab

Source: https://implicitcad.org/docs/tutorial

Command-line usage of the extopenscad compiler to convert a .escad file to STL, then open the result in meshlab. The output shows the rendering message.

```bash
$ extopenscad test.escad test.stl
Rendering 3D object to test.stl
...
$ meshlab test.stl
```

--------------------------------

### Variable reassignment in extopenscad

Source: https://implicitcad.org/docs/faq

Demonstrates the use of variables and loops in extopenscad, which supports proper variable computation unlike OpenSCAD.

```text
a = 5;
for (c = [1, 2, 3]) {
    echo(c);
    a = a*c;
    echo(a);
}
```

--------------------------------

### Create a regular hexagon with circle and $fn

Source: https://implicitcad.org/docs/tutorial

Uses the $fn parameter to create a regular polygon (hexagon) from the circle primitive.

```extopenscad
circle(10, $fn=6);
```

--------------------------------

### shell

Source: https://implicitcad.org/docs/api

Creates a shell of a given width around a shape.

```APIDOC
## shell

### Description
Creates a shell of a given width around a shape.

### Syntax
`shell(w)`

### Parameters
- **w** (number) - Required - Width of the shell.

### Usage
`shell(w) { ... }`
```

--------------------------------

### Create a sphere with radius 10

Source: https://implicitcad.org/docs/tutorial

Creates a 3D sphere with radius 10.

```extopenscad
sphere(10);
```

--------------------------------

### cube primitive

Source: https://implicitcad.org/docs/api

Creates a cube with specified dimensions, centering, and optional rounding.

```ImplicitCAD
cube(size = [2,3,4], center = true, r = 0.5);
```

```ImplicitCAD
cube(4);
```

--------------------------------

### sphere primitive

Source: https://implicitcad.org/docs/api

Creates a sphere using a radius argument.

```ImplicitCAD
sphere(3);
```

```ImplicitCAD
sphere(r=5);
```

--------------------------------

### Create a circle with radius 10

Source: https://implicitcad.org/docs/tutorial

Creates a 2D circle with radius 10 (default units are millimeters). The $fn parameter can be used to create regular polygons.

```extopenscad
circle(10);
```

--------------------------------

### circle primitive

Source: https://implicitcad.org/docs/api

Creates a 2D circle or regular polygon.

```ImplicitCAD
circle(r=10); // circle
```

```ImplicitCAD
circle(r=5, $fn=6); //hexagon
```

--------------------------------

### pack transformation

Source: https://implicitcad.org/docs/api

Arranges objects within a 2D box.

```ImplicitCAD
pack ([45,45], sep=2) { circle(10); circle(10); circle(10); circle(10); }
```

--------------------------------

### cylinder primitive

Source: https://implicitcad.org/docs/api

Creates a cylinder or prism with specified radii, height, and optional centering.

```ImplicitCAD
cylinder(r=10, h=30, center=true);
```

```ImplicitCAD
cylinder(r1=4, r2=6, h=10);
```

```ImplicitCAD
cylinder(r=5, h=10, $fn = 6);
```

--------------------------------

### cube

Source: https://implicitcad.org/docs/api

Creates a cube or rectangular box. Supports specifying size as a vector or individual dimensions, with optional centering and rounding.

```APIDOC
## cube

### Description
Creates a cube or rectangular box.

### Syntax
`cube(size, center, r)`

### Parameters
- **size** (vector or number) - Required - Cube size.
- **center** (boolean) - Optional - Should center? (non-intervals). Default: False.
- **r** (number) - Optional - Radius of rounding. Default: 0.0.

### Syntax 1
`cube(x, y, z, center)`

### Parameters
- **x** (number or interval) - Required - x or x-interval.
- **y** (number or interval) - Required - y or y-interval.
- **z** (number or interval) - Required - z or z-interval.
- **center** (boolean) - Optional - Should center? (non-intervals). Default: False.

### Examples
- `cube(size = [2,3,4], center = true, r = 0.5);` n- `cube(4);`
```

--------------------------------

### pack

Source: https://implicitcad.org/docs/api

Packs multiple 2D objects into a specified box size with a mandatory separation.

```APIDOC
## pack

### Description
Packs multiple 2D objects into a specified box size.

### Syntax
`pack(size, sep)` n
### Parameters
- **size** (vector) - Required - Size of 2D box to pack objects within.
- **sep** (number) - Required - Mandatory space between objects.

### Examples
- `pack ([45,45], sep=2) { circle(10); circle(10); circle(10); circle(10); }`
```

--------------------------------

### unit setting

Source: https://implicitcad.org/docs/api

Sets the working unit for the geometry.

```ImplicitCAD
unit("inch") {..}
```

--------------------------------

### polygon

Source: https://implicitcad.org/docs/api

Creates a polygon from a list of vertices. Supports optional paths and rounding.

```APIDOC
## polygon

### Description
Creates a polygon from a list of vertices.

### Syntax
`polygon(points, paths, r)` n
### Parameters
- **points** (list of tuples) - Required - Vertices of the polygon.
- **paths** (list) - Optional - Order to go through vertices; ignored for now. Default: [].
- **r** (number) - Optional - Rounding of the polygon corners; ignored for now. Default: 0.0.

### Examples
- `polygon ([(0,0), (0,10), (10,0)]);`
```

--------------------------------

### polygon primitive

Source: https://implicitcad.org/docs/api

Creates a 2D polygon from a set of vertices.

```ImplicitCAD
polygon ([(0,0), (0,10), (10,0)]);
```

--------------------------------

### square primitive

Source: https://implicitcad.org/docs/api

Creates a 2D square or rectangle with specified bounds, size, centering, and optional rounding.

```ImplicitCAD
square(x=[-2,2], y=[-1,5]);
```

```ImplicitCAD
square(size = [3,4], center = true, r = 0.5);
```

```ImplicitCAD
square(4);
```

--------------------------------

### circle

Source: https://implicitcad.org/docs/api

Creates a 2D circle or regular polygon. The number of sides can be controlled with $fn.

```APIDOC
## circle

### Description
Creates a 2D circle or regular polygon.

### Syntax
`circle(r, $fn)`

### Parameters
- **r** (number) - Required - Radius of the circle.
- **$fn** (number) - Optional - If defined, makes a regular polygon with n sides instead of a circle. Default: -1.0.

### Examples
- `circle(r=10); // circle` n- `circle(r=5, $fn=6); //hexagon`
```

--------------------------------

### Linear extrude with scaling during extrusion

Source: https://implicitcad.org/docs/tutorial

Extrudes a circle while scaling it as a function of height h.

```extopenscad
linear_extrude(20, scale(h) = 1 + cos(h)/10)
  circle(30);
```

--------------------------------

### unit

Source: https://implicitcad.org/docs/api

Sets the unit of measurement for the design.

```APIDOC
## unit

### Description
Sets the unit of measurement for the design.

### Syntax
`unit(unit)`

### Parameters
- **unit** (string) - Required - The unit you wish to work in.

### Examples
- `unit("inch") {..}`
```

--------------------------------

### Linear extrude with constant height

Source: https://implicitcad.org/docs/tutorial

Extrudes a 2D circle to a 3D object with a constant height of 20.

```extopenscad
linear_extrude(height = 20)
  circle(30);
```

--------------------------------

### linear_extrude

Source: https://implicitcad.org/docs/api

Extrudes a 2D shape linearly to create a 3D shape. Supports height, centering, twist, scale, translate, and rounding.

```APIDOC
## linear_extrude

### Description
Extrudes a 2D shape linearly to create a 3D shape.

### Syntax
`linear_extrude(height, center, twist, scale, translate, r)` n
### Parameters
- **height** (number) - Optional - Height to extrude to. Default: 1.0.
- **center** (boolean) - Optional - Center? (the z component). Default: False.
- **twist** (number or function) - Optional - Twist as we extrude, either a total amount to twist or a function. Default: Undefined.
- **scale** (number or function) - Optional - Scale according to this function as we extrude. Default: Undefined.
- **translate** (number or function) - Optional - Translate according to this function as we extrude. Default: Undefined.
- **r** (number) - Optional - Round the top? Default: 0.0.

### Examples
- `linear_extrude(10) square(5);`
```

--------------------------------

### Explicit union usage

Source: https://implicitcad.org/docs/faq

Correct way to combine multiple objects in ImplicitCAD using the union function.

```text
union(){
  sphere(10);
  translate([20,0,0]) sphere(5);
}
```

--------------------------------

### Create a rounded rectangle with square

Source: https://implicitcad.org/docs/tutorial

Creates a rectangle of size [10,20] with rounded corners of radius 3.

```extopenscad
square([10,20], r=3);
```

--------------------------------

### cylinder

Source: https://implicitcad.org/docs/api

Creates a cylinder or cone. Supports specifying radius, height, bottom/top radii, number of sides, and centering.

```APIDOC
## cylinder

### Description
Creates a cylinder or cone.

### Syntax
`cylinder(r, h, r1, r2, $fn, center)` n
### Parameters
- **r** (number) - Optional - Radius of cylinder. Default: 1.0.
- **h** (number) - Optional - Height of cylinder. Default: 1.0.
- **r1** (number) - Optional - Bottom radius; overrides r. Default: 1.0.
- **r2** (number) - Optional - Top radius; overrides r. Default: 1.0.
- **$fn** (number) - Optional - Number of sides, for making prisms. Default: -1.0.
- **center** (boolean) - Optional - Center cylinder with respect to z? Default: False.

### Examples
- `cylinder(r=10, h=30, center=true);` n- `cylinder(r1=4, r2=6, h=10);` n- `cylinder(r=5, h=10, $fn = 6);`
```

--------------------------------

### Difference with rounding

Source: https://implicitcad.org/docs/tutorial

Cuts away the second square from the first using difference, with rounding r=3.

```extopenscad
difference(r=3) {
  square(20);
  translate([10,10]) square(20);
}
```

--------------------------------

### square

Source: https://implicitcad.org/docs/api

Creates a 2D square or rectangle. Supports specifying size as a vector or individual dimensions, with optional centering and rounding.

```APIDOC
## square

### Description
Creates a 2D square or rectangle.

### Syntax
`square(size, center, r)` n
### Parameters
- **size** (vector or number) - Required - Square size.
- **center** (boolean) - Optional - Should center? (non-intervals). Default: False.
- **r** (number) - Optional - Radius of rounding. Default: 0.0.

### Syntax 1
`square(x, y, center)` n
### Parameters
- **x** (number or interval) - Required - x or x-interval.
- **y** (number or interval) - Required - y or y-interval.
- **center** (boolean) - Optional - Should center? (non-intervals). Default: False.

### Examples
- `square(x=[-2,2], y=[-1,5]);` n- `square(size = [3,4], center = true, r = 0.5);` n- `square(4);`
```

--------------------------------

### sphere

Source: https://implicitcad.org/docs/api

Creates a sphere with a given radius. The radius can be specified as a positional argument or using the named parameter r.

```APIDOC
## sphere

### Description
Creates a sphere with a given radius.

### Syntax
`sphere(r)`

### Parameters
- **r** (number) - Required - Radius of the sphere.

### Examples
- `sphere(3);`
- `sphere(r=5);`
```

--------------------------------

### Union two squares with translation

Source: https://implicitcad.org/docs/tutorial

Combines two squares using union, with the second square translated by [10,10].

```extopenscad
union() {
  square(20);
  translate([10,10]) square(20);
}
```

--------------------------------

### translate transformation

Source: https://implicitcad.org/docs/api

Moves an object by a specified vector.

```ImplicitCAD
translate ([2,3]) circle (4);
```

```ImplicitCAD
translate ([5,6,7]) sphere(5);
```

--------------------------------

### Linear extrude with height function

Source: https://implicitcad.org/docs/tutorial

Extrudes a circle with a height that varies as a function of x and y.

```extopenscad
linear_extrude(height(x,y) = 20 + (y^2-x^2)/60)
  circle(30);
```

--------------------------------

### scale transformation

Source: https://implicitcad.org/docs/api

Resizes an object using a scalar or vector.

```ImplicitCAD
scale(2) square(5);
```

```ImplicitCAD
scale([2,3]) square(5);
```

```ImplicitCAD
scale([2,3,4]) cube(5);
```

--------------------------------

### linear_extrude transformation

Source: https://implicitcad.org/docs/api

Extrudes a 2D shape along the Z-axis.

```ImplicitCAD
linear_extrude(10) square(5);
```

--------------------------------

### rotate_extrude

Source: https://implicitcad.org/docs/api

Extrudes a 2D shape by rotating it around an axis. Supports angle, rounding, translation, and rotation.

```APIDOC
## rotate_extrude

### Description
Extrudes a 2D shape by rotating it around an axis.

### Syntax
`rotate_extrude(a, r, translate, rotate)`

### Parameters
- **a** (number) - Optional - Angle to sweep. Default: 360.0.
- **r** (number) - Optional - Default: 0.0.
- **translate** (vector) - Optional - Default: [0.0,0.0].
- **rotate** (number) - Optional - Default: 0.0.

### Examples
- `rotate_extrude() translate(20) circle(10);`
```

--------------------------------

### Union with rounding (beveling)

Source: https://implicitcad.org/docs/tutorial

Union with r=3 rounds (bevels) the interface between the two squares.

```extopenscad
union(r=3) {
  square(20);
  translate([10,10]) square(20);
}
```

--------------------------------

### rotate_extrude transformation

Source: https://implicitcad.org/docs/api

Sweeps a 2D shape around an axis.

```ImplicitCAD
rotate_extrude() translate(20) circle(10);
```

--------------------------------

### scale

Source: https://implicitcad.org/docs/api

Scales a shape by a scalar or vector.

```APIDOC
## scale

### Description
Scales a shape by a scalar or vector.

### Syntax
`scale(v)` n
### Parameters
- **v** (vector or scalar) - Required - Vector or scalar to scale by.

### Examples
- `scale(2) square(5);` n- `scale([2,3]) square(5);` n- `scale([2,3,4]) cube(5);`
```

--------------------------------

### intersection

Source: https://implicitcad.org/docs/api

Computes the intersection of multiple shapes. Supports optional rounding of the intersection interface.

```APIDOC
## intersection

### Description
Computes the intersection of multiple shapes.

### Syntax
`intersection(r)` n
### Parameters
- **r** (number) - Optional - Radius of rounding for the intersection interface. Default: 0.0.

### Usage
`intersection() { ... }`
```

--------------------------------

### difference

Source: https://implicitcad.org/docs/api

Subtracts one shape from another. Supports optional rounding of the difference interface.

```APIDOC
## difference

### Description
Subtracts one shape from another.

### Syntax
`difference(r)` n
### Parameters
- **r** (number) - Optional - Radius of rounding for the difference interface. Default: 0.0.

### Usage
`difference() { ... }`
```

--------------------------------

### union

Source: https://implicitcad.org/docs/api

Combines multiple shapes into a single shape. Supports optional rounding of the union interface.

```APIDOC
## union

### Description
Combines multiple shapes into a single shape.

### Syntax
`union(r)` n
### Parameters
- **r** (number) - Optional - Radius of rounding for the union interface. Default: 0.0.

### Usage
`union() { ... }`
```

--------------------------------

### translate

Source: https://implicitcad.org/docs/api

Translates a shape by a given vector or individual coordinates.

```APIDOC
## translate

### Description
Translates a shape by a given vector or individual coordinates.

### Syntax
`translate(v)` n
### Parameters
- **v** (vector) - Required - Vector to translate by.

### Syntax 1
`translate(x, y, z)` n
### Parameters
- **x** (number) - Required - x amount to translate.
- **y** (number) - Required - y amount to translate.
- **z** (number) - Optional - z amount to translate. Default: 0.0.

### Examples
- `translate ([2,3]) circle (4);` n- `translate ([5,6,7]) sphere(5);`
```

--------------------------------

### rotate

Source: https://implicitcad.org/docs/api

Rotates a shape by an angle or list of angles, optionally around a specified vector.

```APIDOC
## rotate

### Description
Rotates a shape by an angle or list of angles.

### Syntax
`rotate(a, v)` n
### Parameters
- **a** (number or list) - Required - Value to rotate by; angle or list of angles.
- **v** (vector) - Optional - Vector to rotate around if a is a single angle. Default: [0.0,0.0,1.0]. n
### Usage
`rotate(a) { ... }`
```

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