animate random mesh color, for threjs_playGnd

randomColor.js

       				/* ------------------- INSTRUCTIONS -----

				to animate random colors
				add the code below to your draw() fucntion

				-------------------------------------- */

				var randomColor = Math.random() * 0xffffff;
				mesh.material.color.setHex(randomColor);
				
				
				// ** NOTE ** only 'Basic', 'Lambert' and 'Phong'
				// 	material have a color property, the
				//	'Normal' material has no color property


				/* -------------------------------------- 
		        	try also, moving and/or spinning your mesh
		        	add the code below to your draw() function
		        	-------------------------------------- */
		        	mesh.position.x = Math.sin( Date.now() * 0.001 ) * 50;  
				mesh.rotation.z = Date.now() * 0.0005;

				/* -------------------------------------- 
		        	try also leaving trails
		        	replace the 'renderer = new ...' on line 27
				in the setup() function, with the code below
		        	-------------------------------------- */
		        	renderer = new THREE.WebGLRenderer( { preserveDrawingBuffer: true } );
				renderer.autoClearColor = false;