ecmascript:

			var e = 5;
			var f = 5;
			var g = 5;
			var h = 5;
			var resolution = 100;

			function initialize() {
			     generateCoordinates();
			     var localci = [];
			     for (var i = 0; i < resolution-1; i++) {
				for (var j = 0; j < resolution-1; j++) {
				     localci.push(i*resolution+j);
				     localci.push(i*resolution+j+1);
				     localci.push((i+1)*resolution+j+1);
				     localci.push((i+1)*resolution+j);
				     localci.push(-1);
				}
			    }
			    coordIndexes = new MFInt32(localci);
			}

			function generateCoordinates() {
			     var theta = 0.0;
			     var phi = 0.0;
			     var delta = (2 * 3.141592653) / (resolution-1);
			     var localc = [];
			     for (var i = 0; i < resolution; i++) {
				for (var j = 0; j < resolution; j++) {
					var rho = e + f * Math.cos(g * theta) * Math.cos(h * phi);
					localc.push(new SFVec3f(
						rho * Math.cos(phi) * Math.cos(theta),
						rho * Math.cos(phi) * Math.sin(theta),
						rho * Math.sin(phi)
					));
					theta += delta;
				}
				phi += delta;
			     }
			     
			     coordinates = new MFVec3f(localc);
			}

			function set_fraction(fraction, eventTime) {
				var choice = Math.floor(Math.random() * 4);
				switch (choice) {
				case 0:
					e += Math.floor(Math.random() * 2) * 2 - 1;
					break;
				case 1:
					f += Math.floor(Math.random() * 2) * 2 - 1;
					break;
				case 2:
					g += Math.floor(Math.random() * 2) * 2 - 1;
					break;
				case 3:
					h += Math.floor(Math.random() * 2) * 2 - 1;
					break;
				}
				if (e < 1) {
					f = 10;
				}
				if (f < 1) {
					f = 10;
				}
				if (g < 1) {
					g = 4;
				}
				if (h < 1) {
					h = 4;
				}
				generateCoordinates();
			}