toSpace( cameraMatrix, target ) {

		for ( let i = 0; i < 4; i ++ ) {

			target.vertices.near[ i ]
				.copy( this.vertices.near[ i ] )
				.applyMatrix4( cameraMatrix );

			target.vertices.far[ i ]
				.copy( this.vertices.far[ i ] )
				.applyMatrix4( cameraMatrix );

		}

	}
Transforms the given target CSM frustum into the different coordinate system defined by the
given camera matrix.

@param {Matrix4} cameraMatrix - The matrix that defines the new coordinate system.
@param {CSMFrustum} target - The CSM to convert.