three.js/examples/js/geometries/ConvexGeometry.js

( function () {

	var ConvexGeometry = function ( points ) {

		THREE.BufferGeometry.call( this ); // buffers

		var vertices = [];
		var normals = [];

		if ( THREE.ConvexHull === undefined ) {

			console.error( 'THREE.ConvexBufferGeometry: ConvexBufferGeometry relies on THREE.ConvexHull' );

		}

		var convexHull = new THREE.ConvexHull().setFromPoints( points ); // generate vertices and normals

		var faces = convexHull.faces;

		for ( var i = 0; i < faces.length; i ++ ) {

			var face = faces[ i ];
			var edge = face.edge; // we move along a doubly-connected edge list to access all face points (see HalfEdge docs)

			do {

				var point = edge.head().point;
				vertices.push( point.x, point.y, point.z );
				normals.push( face.normal.x, face.normal.y, face.normal.z );
				edge = edge.next;

			} while ( edge !== face.edge );

		} // build geometry


		this.setAttribute( 'position', new THREE.Float32BufferAttribute( vertices, 3 ) );
		this.setAttribute( 'normal', new THREE.Float32BufferAttribute( normals, 3 ) );

	};

	ConvexGeometry.prototype = Object.create( THREE.BufferGeometry.prototype );
	ConvexGeometry.prototype.constructor = ConvexGeometry;

	THREE.ConvexGeometry = ConvexGeometry;

} )();