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Creating a new design starts by writing simple scripts which call functions to create and manipulate shapes. JSCAD executes the script, and renders the design for viewing.

A JSCAD script must have at least one function defined, the **main()** function, which must to return a shape.

function main() { return sphere() // a single shape }

Or an array of shapes.

function main() { const a = cube() const b = sphere() const c = cylinder() return [a,b,c] // an array of shapes }

In addition, functions can be created and called, i.e. normal JavaScript.

function a(options) { // passed from main() below var w = [] w.push( sphere() ) w.push( cube(options).translate([2,0,0]) ) return w } function main() { let list = a({radius: 10}) return list }

JSCAD designs can pass parameters from one function to another, just like in the example. This is because JSCAD designs are really JavaScript.

There are a few special parameters which are important to understand.

JSCAD tries to maintain a consistent and easy to use set of functions (API). Although most functions require specific options, most have defaults and do not need to be supplied. Every function has predefined defaults, even shapes (The defaults are shown along side of examples for each function.)

Options are passed as attributes of another object. In most cases, the options are assigned a value, and bracketed with ‘{…}’.

cylinder({start: [0,0,0], end: [0,0,10], r1: 1, r2: 2, fn: 50})

Why the strange syntax? There can be lots parameters, default parameters can be skipped, order is not important, etc. This provides a lot of flexibility when creating complex designs.

When 3D vectors are required, parameters can be passed as an array. If a scalar (single value) is passed for a parameter which expects a 3D vector, the scalar is used for the x, y and z values. In other words: radius: 1 will give radius: [1,1,1].

A design can have parameters by declaring a special function; getParameterDefinitions().

In applications and browsers, these parameters are presented to users, allowing users to interactively change designs.

This function must return an array of parameter definitions, as show below.

function getParameterDefinitions() { return [ { name: 'length', type: 'int', initial: 150, caption: 'Length?' }, { name: 'width', type: 'int', initial: 100, caption: 'Width?' }, ]; }

The parameters are evaluated and values are passed into the main function. Be sure to declare the main function properly.

function main(params) { var l = params.length; var w = params.width; ... }

The parameters are defined as input fields on a single HTML5 form, i.e. the list of parameters. For more information on HTML5 input fields, see some examples at W3 Schools.

*Note: Browsers are NOT the same and will treat unsupported parameter types as TEXT.*

Type | Example | Returned Value |
---|---|---|

checkbox | {name: 'bigorsmall', type: 'checkbox', checked: true, caption: 'Big?'} | if checked true, else false |

checkbox | {name: 'bigorsmall', type: 'checkbox', checked: true, initial: 20, caption: 'Big?'} | if checked 20, else false |

color | { name: 'color', type: 'color', initial: '#FFB431', caption: 'Color?' } | “#rrggbb”, use html2rgb() to convert |

date | {name: 'birthday', type: 'date', caption: 'Birthday?'} | “YYYY-MM-DD” |

{name: 'address', type: 'email', caption: 'Email Address?'} | string value | |

float | {name: 'angle', type: 'number', initial: 2.5, step: 0.5, caption: 'Angle?'} | float value |

int | {name: 'age', type: 'int', initial: 20, caption: 'Age?'} | integer value |

number | {name: 'angle', type: 'number', initial: 2.5, step: 0.5, caption: 'Angle?'} | float value |

password | {name: 'password', type: 'password', caption: 'Secret?'} | string value |

slider | {name: 'count', type: 'slider', min: 2, max: 10, caption: 'How many?'} | float value |

text | {name: 'name', type: 'text', caption: 'Name?'} | string value |

url | {name: 'webpage', type: 'url', caption: 'Web page URL?'} | string value |

group | { name: 'balloon', type: 'group', caption: 'Balloons' } | none, only displayed |

*Note: The parameters accept additional restrictions and assistance. These include 'initial', 'max', 'maxLength', 'min', 'pattern', 'placeholder', 'size', and 'step'.*

JSCAD designs can pass parameters from one function to another, just like in the example. This is because JSCAD designs are really JavaScript.

There are a few special parameters which are important to understand.

JSCAD tries to maintain a consistent and easy to use set of functions (API). Although most functions require specific options, most have defaults and do not need to be supplied. Every function has predefined defaults, even shapes (The defaults are shown along side of examples for each function.)

Options are passed as attributes of another object. In most cases, the options are assigned a value, and bracketed with ‘{…}’.

cylinder({start: [0,0,0], end: [0,0,10], r1: 1, r2: 2, fn: 50})

Why the strange syntax? There can be lots parameters, default parameters can be skipped, order is not important, etc. This provides a lot of flexibility when creating complex designs.

‘3D’ stands for three (3) dimensional. A 3D primitive is any shape that has three dimensions, which are often called width, depth, and height (or X, Y, Z.) 3D shapes have a known volume if closed.

The mathematical study of 3D shapes and dimensions is called solid geometry.

All rounded shapes have a `resolution`

option which controls tesselation. If `resolution`

is set to 8, then 8 polygons are used to create 360 degrees of revolution.

This allows each design to control the amount of detail present, but beware that calculations and rendering time will also increase. For example, the number of polygons increases quadratically with each increase of the `resolution`

for spheres.

EXAMPLE

If the `resolution`

option is omitted, the following resolution is used.

- CSG.defaultResolution3D = 12

OpenSCAD like functions support the `fn`

parameter, which is the same as `resolution`

.

A three dimensional shape created from six retangular faces, each at right angles to another, and opposite faces are equal. The **cube** is a special case of the a cuboid in which all six faces are squares.

*Learn about cuboids at MathIsFun.com*

Cubes can be created at a requested center. The radius specifies the size of the faces. Cubes with different radius for X, Y and Z axis can be specified by supplying an array of values.

Defaults:

- size : 1 or [1,1,1]
- center : [0,0,0]
- radius : 0
- round: false

cube({size: 1}) cube({size: [1,2,3]}) cube({size: 1, center: true}) // default center:false cube({size: 1, center: [false,false,false]}) // individual axis center true or false cube({size: [1,2,3], round: true})

Also, the CSG library functions can be used directly. *NOTE Deprecated in the V2 API*

CSG.cube({ center: [0, 0, 0], radius: [1, 1, 1] }) CSG.cube({ // define two opposite corners corner1: [4, 4, 4], corner2: [5, 4, 2] })

Rounded cubes are created by specifying a rounded radius for the corners and the sides.

CSG.roundedCube({ // rounded cube center: [0, 0, 0], radius: 1, roundradius: 0.9, resolution: 8, });

A three dimensional shape like a ball, where every point on the surface is the same distance from the center.

*Learn about spheres at MathIsFun.com*

Creates a sphere at the requested center. The radius argument determines the size of the sphere. The resolution option determines the number of segments to create in 360 degrees of rotation.

*Note: See the start of 3D Primitives for information about the resolution of three dimenional shapes.*

Defaults:

- radius : 1 or [1,1,1]
- center : [0,0,0]
- resolution : Resolution3D (12)

sphere(1); sphere({r: 2}); // Note: center:true is default (unlike other primitives, as OpenSCAD) sphere({r: 2, center: true}); // Note: OpenSCAD doesn't support center for sphere but we do sphere({r: 2, center: [false, false, true]}); // individual axis center sphere({r: 10, fn: 100 }); sphere({r: 10, fn: 100, type: 'geodesic'}); // geodesic approach (icosahedron further triangulated)

In case of ``type: 'geodesic'`` the fn tries to match the non-geodesic fn, yet, actually changes in steps of 6 (e.g. fn=6..11 is the same), fn = 1 reveals the base form: the icosahedron.

The CSG library functions can also be used. *NOTE Deprecated in the V2 API*

CSG.sphere({ center: [0, 0, 0], radius: 2, // must be scalar resolution: 128 });

A three dimensional shape with two flat ends that are circular or elliptical. The cylinder has the same cross-section from one end to the other.

*Learn about cylinders at MathIsFun.com*

The following show examples of creating cylinders. The radius specifies the size about the axis. The resolution option determines the number of segments to create in 360 degrees of rotation.

If necessary then additional options can be provide for start and end points of the axis. As well as start and end radius.

*Note: See the start of 3D Primitives for information about the resolution of three dimensional shapes.*

Defaults:

- radius : 1 or
- radiusStart : 1
- radiusEnd : 1

- axis :
- start : [0,0,-1], end : [0,0,1]

- resolution : Resolution3D (12)

*Note: A start or end radius of 0 creates a cone.*

cylinder({r: 1, h: 10}) cylinder({r: 1, h: 10, center: true}) // default: center:false cylinder({r: 1, h: 10, center: [true, true, false]}) cylinder({r: 1, h: 10, round: true}) cylinder({r1: 3, r2: 0, h: 10}) cylinder({start: [0,0,0], end: [0,0,10], r1: 1, r2: 2, fn: 50})

The CSG library functions can also be used. *NOTE: Deprecated in the V2 API*

CSG.cylinder({ start: [0, -1, 0], end: [0, 1, 0], radius: 1, // true cylinder resolution: 16 }); CSG.cylinder({ start: [0, -1, 0], end: [0, 1, 0], radiusStart: 1, // start- and end radius defined, partial cones radiusEnd: 2, resolution: 16 }); CSG.roundedCylinder({ // and its rounded version start: [0, -1, 0], end: [0, 1, 0], radius: 1, resolution: 16 });

A three dimensional shape made by revolving a small circle (inner) along the circumference a bigger circle (outer).

*Learn about torus at MathIsFun.com*

A torus is defined as such:

- Inner Circle
- ri = inner radius
- fni = inner resolution
- roti = inner rotation

- Outer Circle
- ro = outer radius
- fno = outer resolution

Defaults:

- ri : 1
- fni : 16
- roti : 0
- ro : 4
- fno : 32

torus() torus({ ri: 1.5, ro: 3 }) torus({ ri: 0.2 }) torus({ fni:4 }) // make inner circle fn = 4 => square torus({ fni:4,roti:45 }) // rotate inner circle, so flat is top/bottom torus({ fni:4,fno:4,roti:45 }) torus({ fni:4,fno:5,roti:45 })

A three dimensional shape where connecting faces create a solid. Each face is a three dimensional polygon (a flat shape with straight sides).

*Learn about polyhedrons at MathIsFun.com*

Create a polyhedron with a list of points and a list of triangles or polygons. The point list is all the vertexes of the shape, the triangle list is how the points relates to the surfaces of the polyhedron

polyhedron({ // openscad-like (e.g. pyramid) points: [ [10,10,0],[10,-10,0],[-10,-10,0],[-10,10,0], // the four points at base [0,0,10] ], // the apex point triangles: [ [0,1,4],[1,2,4],[2,3,4],[3,0,4], // each triangle side [1,0,3],[2,1,3] ] // two triangles for square base });

Additionally you can also define `polygons: [ [0,1,4,5], [..] ]` too, not just `triangles:`.

You can also create a polyhedron at a more low-level.

var polygons = []; polygons.push(new CSG.Polygon([ new CSG.Vertex(new CSG.Vector3D(-5,-5,0)), new CSG.Vertex(new CSG.Vector3D(2,2,5)), new CSG.Vertex(new CSG.Vector3D(3,3,15)) ]) ); // add more polygons and finally: solid = CSG.fromPolygons(polygons);

‘2D’ stands for two (2) dimensional. A 2D primitive is any shape that has two dimensions, which are width and length (or X and Y.) The 2D dimensional shapes have no thickness (Although, JSCAD shows a very thin shape.)

One way of thinking about 2D shapes is anything that lays flat on a piece of paper, such as drawing a circle or a square.

The mathematical study of 2D shapes and dimensions is called plane geometry.

All rounded shapes have a `resolution`

option which controls tesselation. If `resolution`

is set to 8, then 8 polygons are used to create 360 degrees of revolution.

This allows each design to control the amount of detail present, but beware that calculations and rendering time will also increase. For example, the number of polygons increases quickly with each increase of the `resolution`

for circles.

EXAMPLE

If the `resolution`

option is omitted, the following resolution is used.

- CSG.defaultResolution2D = 32

OpenSCAD like functions support the `fn`

parameter, which is the same as `resolution`

.

A two dimensional shape made with four straight sides where all interior angles are right angles (90°).

*Learn about rectangles at MathIsFun.com*

The following show examples of creating rectangles. The radius specifies the size. Rectangles with different radius for X and Y axis can be specified by supplying an array of values.

Defaults:

- radius : 1 or [1,1]
- center : [0,0]

square(5); // square 5 x 5 square([2,3]); // rectangle 2 x 3 square({size: [2,4], center: true}); // rectangle 2 x 4, centered on both X and Y axis

The CSG library functions can also be used. *NOTE: Deprecated in the V2 API*

CAG.rectangle({center: [0,0], radius: [5, 10]}); CAG.roundedRectangle({center: [0,0], radius: [10, 50], roundradius: 1, resolution: 4});

A two dimensional shape made by drawing a curve that is always the same distance from a center. All points are the same distance from the center.

*Learn about circles at MathIsFun.com*

The following show examples of creating circles. The radius specifies the size. The resolution option determines the number of segments to create in 360 degrees of rotation.

*Note: See the start of 2D Primitives for information about the resolution of two dimensional shapes.*

Defaults:

- radius : 1
- center : [0,0]
- resolution: defaultResolution2D (32)

let c1 = circle(1) let c2 = circle({r: 2, fn:5}) // fn = number of segments to approximate the circle let c3 = circle({r: 3, center: true})

The CSG library functions can also be used. *NOTE: Deprecated in the V2 API*

let c4 = CAG.circle({center: [0,0], radius: 3, resolution: 32})

A two dimensional shape with straight sides, and the shape is “closed” (all the sides connect up).

*Learn about polygons at MathIsFun.com*

The following show examples of creating polygons from a list of points.

Defaults:

- empty

let p1 = polygon([ [0,0],[3,0],[3,3] ]) let p2 = polygon({ points: [ [0,0],[3,0],[3,3] ] })

The CSG library functions can also be used. *NOTE: Deprecated in the V2 API*

let p3 = CAG.fromPoints([ [0,0],[5,0],[3,5],[0,5] ])

All shapes can be transformed, i.e. translated to another location, rotated by certain degrees, etc. In all cases, the transform function returns a **new shape**, not the original.

let circleA = circle({radius: 5}) let circleB = circleA.scale([5,10]) // a new cicle, scaled as requested

So, in order to modify the original, place that on the left-hand side of the expression.

let circleA = circle({radius: 5}) circleA = circleA.scale([5,10]) // a new circle, scaled as requested, reassigned to the original

In fact, the two lines above can be combined into a single line.

let circleA = circle({radius: 5}).scale([5,10]) // a new circle, and scaled as requested

Transforms can also be chained together.

// rotate the circle about the X axis by 45 degrees // and translate the circle up the Z axis 10 units // and assign the result to circleB let circleB = circleA.rotateX(45).translate([0,0,10])

The original shape can be transformed any number of times. For example, the same cylinder can be rotated, making copies of the cylinders, and then unioned together. This is a common pattern when creating complex designs.

The standard for all 3D systems today, including graphics cards, design tools, etc. is orientating shapes using the right-hand rule. JSCAD follows the same rules internally, and produces shapes, applies transforms, etc. using the right-hand rule of orientation.

Shapes can be rotated by any given degree about the X, Y, and Z axis. The degrees can be specified as either positive or negative values.

*Learn about rotation at MathIsFun.com*

Defaults:

- degree : 0 or [0,0,0]

let obj = cube([5,20,5]) obj = rotate([90,15,30],obj) obj = rotate(90,[1,0.25,0.5],obj)

The CSG library functions can also be used. *NOTE: Deprecated in the V2 API*

obj.rotateX(90); obj.rotateY(45); obj.rotateZ(30); obj.rotate(rotationCenter, rotationAxis, degrees) obj.rotateEulerAngles(alpha, beta, gamma, position)

Shapes can be scaled by any factor. Shapes are enlarged (increases) or shrunk (diminishes) by a scale factor. The result of scaling is a similar shape (in the geometric sense) to the original.

*Learn about the scaling shapes at Wikipedia.org*

Defaults:

- factor : 1.0 or [1.0,1.0,1.0]

let obj = sphere(5) obj = scale(2,obj) obj = scale([1,2,3],obj)

The CSG library functions can also be used. *NOTE: Deprecated in the V2 API*

obj.scale([1,2,3])

Shapes can be translated (moved) to another location. In other words, every point in the shape is moved by a fixed distance in the same direction. The offset can be positive or negative.

*Learn about translation at MathIsFun.com*

Defaults:

- offset : 0 or [0,0,0]

let obj = sphere(5) obj = translate([0,0,10],obj)

The CSG library functions can also be used. *NOTE: Deprecated in the V2 API*

obj.translate([0,0,10])

Shapes can be centered about the X, Y or Z axis.

*Note: The center of a shape is calculated as the midpoint between minimal and maximum points.*

let obj = sphere(5) obj = center(true,cube(), obj) // center the objects across all axes obj = center([true, true, false], obj) // center the object across only X and Y axis

The CSG library functions can also be used. *NOTE: Deprecated in the V2 API*

cube().center(true) // center the object across all axes cube().center([true,true,false]) // center the object across only X and Y axis

Shapes can reflect about the X, Y, or Z axis.

*Learn about reflection at MathIsFun.com*

Defaults:

- axis : 0 or [0, 0, 0], set 1 to reflect about X, Y, or Z axis

let obj = cube([5, 20, 5]) obj = mirror([1, 0, 1], obj) // mirror about X and Z axis

The CSG library functions can also be used. *NOTE: Deprecated in the V2 API*

var cube = CSG.cube().translate([1,0,0]) var cube2 = cube.mirroredX() // mirrored about the X axis var cube3 = cube.mirroredY() // mirrored about the Y axis var cube4 = cube.mirroredZ() // mirrored about the Z axis // create a plane by specifying 3 points: var plane = CSG.Plane.fromPoints([5,0,0], [5, 1, 0], [3, 1, 7]); // and mirror in that plane: var cube5 = cube.mirrored(plane);

The previous transforms are actually simplified versions of matrix mathematics. For example, translate is just applying additition using a matrix.

*Learn about matrix mathematics at MathIsFun.com*

let m = new CSG.Matrix4x4() m = m.multiply(CSG.Matrix4x4.rotationX(40)) m = m.multiply(CSG.Matrix4x4.rotationZ(40)) m = m.multiply(CSG.Matrix4x4.translation([-.5, 0, 0])) m = m.multiply(CSG.Matrix4x4.scaling([1.1, 1.2, 1.3])) // and apply the transform: let cube3 = cube().transform(m)

Shapes can exhibit different colors. And just like the other transformations, adding color to a shape produces a new shape, one with color.

*NOTE: 2D shapes cannot exhibit colors today. This is a known issue.*

let a = color("Red",sphere()) let b = color([1, 0.5, 0.3],sphere()) let c = color([1, 0.5, 0.3, 0.6],sphere(10),cube(20))

See the Extended Color Keywords for all available colors. Color keywords are case-insensitive, e.g. 'RED' is the same as 'red'.

The CSG library functions can also be used. *NOTE: Deprecated in the V2 API*

let a = object.setColor(css2rgb('dodgerblue')) let b = sphere().setColor(1, 0.5, 0.3) let c = sphere().setColor([1, 0.5, 0.3, 0.7])

*Note: There are known issues with transparency, and depending on the order of colors, objects may not seem transparent. Try different 'alpha' values or colors.*

Following functions to convert between color spaces.

let rgb = css2rgb('navy') let rgb = html2rgb('#RRGGBB') let rgb = hsl2rgb(h,s,l) // or hsl2rgb([h,s,l]) let rgb = hsv2rgb(h,s,v) // or hsv2rgb([h,s,v]) let hsv = rgb2hsv(r,g,b) // or rgb2hsv([r,g,b]) let hsl = rgb2hsl(r,g,b) // or rgb2hsl([r,g,b]) let html = rgb2html(r,g,b)

whereas

- r,g,b (red, green, blue)
- h,s,l (hue, saturation, lightness)
- h,s,v (hue, saturation, value)

All shapes (primitives or the results of operations) can be passed to special functions to perform logical operations, e.g. removing a hole from a board. In all cases, the operation returns the results, and **never** changes the original shapes.

Several shapes can be combined (merged) into a single shape. The result is the logical union of the shapes. The combining of smaller obects together allows easier transformations, etc.

let shape = union(sphere({r: 1, center: true}), cube({size: 1.5, center: true})

The CSG library functions can also be used. *NOTE: Deprecated in the V2 API*

sphere({r: 1, center: true}).union(cube({size: 1.5, center: true}))

Several objects can be combined (overlapped) into a single shape. This result is the logical intersection of the shapes.

let shape = intersection(sphere({r: 1, center: true}), cube({size: 1.5, center: true}))

The CSG library functions can also be used. *NOTE: Deprecated in the V2 API*

sphere({r: 1, center: true}). intersect(cube({size: 1.5, center: true}))

Several shapes can be removed (subtracted) from another. The result is the logical difference of shapes.

*Note: The first shape given is the base shape for all subtractions.*

let shape = difference(sphere({r: 1, center: true}), cube({size: 1.5, center: true}))

The CSG library functions can also be used. *NOTE: Deprecated in the V2 API*

sphere({r: 1, center: true}). subtract(cube({size: 1.5, center: true}))

Several shapes can be combined together to form the convex hull, i.e. sum of the outside shells. This includes irregular shapes such as combining a circle with a square.

*Note: Convex hulls can be viewed as elastic wrapping around several shapes.*

EXAMPLE

*Learn more about convex hull at Wikipedia.org*

let h = hull(square(10), translate([5, 10, 15], circle(10)))

Chain Hull is a variant of Hull across multiple 2D forms, essentially sequential hulling, then creating a union of the results.

chain_hull( circle(), circle().translate([2,0,0]), ... ); // list of CAG/2D forms let a = []; a.push(circle()); chain_hull( a ); // array of CAG/2D forms chain_hull({closed: true}, // default is false circle(), circle().translate([2, 0, 0]), circle().translate([2, 2, 0]))