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title: CircleGeometry category: Core layout: docs

CircleGeometry

A simple shape of Euclidean geometry. It is constructed from a number of triangular segments that are oriented around a central point and extend as far out as a given radius. It is built counter-clockwise from a start angle and a given central angle. It can also be used to create regular polygons, where the number of segments determines the number of sides.

Code Example

const geometry = new THREE.CircleGeometry( 5, 32 );
const material = new THREE.MeshBasicMaterial( { color: 0xffff00 } );
const circle = new THREE.Mesh( geometry, material );
scene.add( circle )

Constructor

new CircleGeometry( radius : number, segments : number, thetaStart : number, thetaLength : number )

Constructs a new circle geometry.

radius | Radius of the circle. Default is 1.
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segments | Number of segments (triangles), minimum = 3. Default is 32.
thetaStart | Start angle for first segment in radians. Default is 0.
thetaLength | The central angle, often called theta, of the circular sector in radians. The default value results in a complete circle. Default is Math.PI*2.

Properties

.parameters : Object

Holds the constructor parameters that have been used to generate the geometry. Any modification after instantiation does not change the geometry.

Static Methods

.fromJSON( data : Object ) : CircleGeometry

Factory method for creating an instance of this class from the given JSON object.

data | A JSON object representing the serialized geometry.
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Returns: A new instance.

Source

src/geometries/CircleGeometry.js