Generate geometry representing a parametric surface.
		const geometry = new THREE.ParametricGeometry( THREE.ParametricGeometries.klein, 25, 25 );
		const material = new THREE.MeshBasicMaterial( { color: 0x00ff00 } );
		const klein = new THREE.Mesh( geometry, material );
		scene.add( klein );
		
		
		func — A function that takes in a [page:Float u] and [page:Float v] value each between 0 and 1 and modifies a third [page:Vector3] argument. Default is a function that generates a curved plane surface.
		slices — The count of slices to use for the parametric function. Default is *8*.
		stacks — The count of stacks to use for the parametric function. Default is *8*.
		
See the base [page:BufferGeometry] class for common properties.
An object with a property for each of the constructor parameters. Any modification after instantiation does not change the geometry.
See the base [page:BufferGeometry] class for common methods.
[link:https://github.com/mrdoob/three.js/blob/master/examples/jsm/geometries/ParametricGeometry.js examples/jsm/geometries/ParametricGeometry.js]