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## 3D Primitives

Introduction

### Resolution of Shapes

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

OpenSCAD like functions support the `fn` parameter, which is the same as `resolution`.

### Cube

Cubes or rounded cubes are created by specifying one or more radius values.

```cube(1);
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, using CSG library directly is possible. TO BE DECOMMISSIONED

```CSG.cube({
center: [0, 0, 0],
});

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

CSG.roundedCube({ // rounded cube
center: [0, 0, 0],
resolution: 8,
});```

### Sphere

Spheres can be created like this:

```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)

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

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.

### Cylinder

Cylinders and cones can be created like this:

```cylinder({r: 1, h: 10});                 // openscad like
cylinder({d: 1, h: 10});
cylinder({r: 1, h: 10, center: true});   // default: center:false
cylinder({r: 1, h: 10, center: [true, true, false]});  // individual x,y,z center flags
cylinder({r: 1, h: 10, round: true});
cylinder({r1: 3, r2: 0, h: 10});
cylinder({d1: 1, d2: 0.5, h: 10});
cylinder({start: [0,0,0], end: [0,0,10], r1: 1, r2: 2, fn: 50});

CSG.cylinder({                      //using the CSG primitives
start: [0, -1, 0],
end: [0, 1, 0],
resolution: 16
});
CSG.cylinder({
start: [0, -1, 0],
end: [0, 1, 0],
resolution: 16
});
CSG.roundedCylinder({               // and its rounded version
start: [0, -1, 0],
end: [0, 1, 0],
resolution: 16
});```

### Torus

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

A torus is defined as such:

• Inner Circle
• fni = inner resolution
• roti = inner rotation
• Outer Circle
• fno = outer resolution

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

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 })```