s.massConservation = false;

					updateAll();

				};
				gui.add( params, 'Campfire' );

				params.Fireball = function () {

					params.color1 = 0xffffff;
					params.color2 = 0xffa000;
					params.color3 = 0x000000;
					params.windX = 0.0;
					params.windY = 0.75;
					params.colorBias = 0.8;
					params.burnRate = 1.2;
					params.diffuse = 3.0;
					params.viscosity = 0.0;
					params.expansion = 0.0;
					params.swirl = 6.0;
					params.drag = 0.0;
					params.airSpeed = 20.0;
					params.speed = 