[page:Geometry] →
# [name]

A class for generating cylinder geometries

## Code Example

```
const geometry = new THREE.CylinderGeometry( 5, 5, 20, 32 );
const material = new THREE.MeshBasicMaterial( {color: 0xffff00} );
const cylinder = new THREE.Mesh( geometry, material );
scene.add( cylinder );
```

## Constructor

### [name]([param:Float radiusTop], [param:Float radiusBottom], [param:Float height], [param:Integer radialSegments], [param:Integer heightSegments], [param:Boolean openEnded], [param:Float thetaStart], [param:Float thetaLength])

radiusTop — Radius of the cylinder at the top. Default is 1.

radiusBottom — Radius of the cylinder at the bottom. Default is 1.

height — Height of the cylinder. Default is 1.

radialSegments — Number of segmented faces around the circumference of the cylinder. Default is 8

heightSegments — Number of rows of faces along the height of the cylinder. Default is 1.

openEnded — A Boolean indicating whether the ends of the cylinder are open or capped. Default is false, meaning capped.

thetaStart — Start angle for first segment, default = 0 (three o'clock position).

thetaLength — The central angle, often called theta, of the circular sector. The default is 2*Pi, which makes for a complete cylinder.

## Properties

See the base [page:Geometry] class for common properties.

### [property:Object parameters]

An object with a property for each of the constructor parameters. Any modification after instantiation does not change the geometry.

## Methods

See the base [page:Geometry] class for common methods.

## Source

[link:https://github.com/mrdoob/three.js/blob/master/src/[path].js src/[path].js]