var w = window.innerWidth, h = window.innerHeight;
window.onresize = function(){
  var w = window.innerWidth, h = window.innerHeight;
  camera.aspect = w / h;
  camera.updateProjectionMatrix();
  renderer.setSize( w, h );
}

cameraSpeed = .00015;
lightSpeed = .001;
tubularSegments = 1000;
radialSegments = 3;
tubeRadius = 2;
ambientLight = 0x222222;
lightColor = 0xffffff;
lightIntensity = 1;
lightDistance = 20;
hs = 0; // Hue-Start
he = 360; // Hue-End

var renderer = new THREE.WebGLRenderer({
  canvas: document.querySelector("canvas"),
  antialias: true,
});
renderer.setSize(w, h);

var scene = new THREE.Scene();
var camera = new THREE.PerspectiveCamera(60, w / h, .001, 1000);

var starsGeometry = new THREE.Geometry();
for(i=0; i<3000; i++){
	var star = new THREE.Vector3();
	star.x = THREE.Math.randFloatSpread(1500);
	star.y = THREE.Math.randFloatSpread(1500);
	star.z = THREE.Math.randFloatSpread(1500);
	starsGeometry.vertices.push(star);
}
var starsMaterial = new THREE.PointsMaterial({color: 0xffffff});
var starField = new THREE.Points(starsGeometry,starsMaterial);
scene.add(starField);

for (i=0; i<p.length; i++) {
  var x = p[i][0];
  var y = p[i][2];
  var z = p[i][1];
  p[i] = new THREE.Vector3(x,y,z);
}
var path = new THREE.CatmullRomCurve3(p);
var geometry = new THREE.TubeGeometry(path,tubularSegments,tubeRadius,radialSegments,true);

hue = hs;
hup = true;
for(i=0; i<geometry.faces.length; i++){
  hup==1?hue++:hue--;
  hue==he?hup=false:(hue==hs)?hup=true:0;
  geometry.faces[i].color = new THREE.Color("hsl("+hue+",100%,50%)");
}

var material = new THREE.MeshLambertMaterial({
  side: THREE.BackSide,
  vertexColors: THREE.FaceColors,
  wireframe: true
});

var tube = new THREE.Mesh(geometry, material);
scene.add(tube);

var light = new THREE.PointLight(0xffffff, 1, 50);
scene.add(light);
var light2 = new THREE.AmbientLight(ambientLight);
scene.add(light2);

var l1 = new THREE.PointLight(lightColor, lightIntensity, lightDistance);
scene.add(l1);
var l2 = new THREE.PointLight(lightColor, lightIntensity, lightDistance);
scene.add(l2);
var l3 = new THREE.PointLight(lightColor, lightIntensity, lightDistance);
scene.add(l3);
var l4 = new THREE.PointLight(lightColor, lightIntensity, lightDistance);
scene.add(l4);
var l5 = new THREE.PointLight(lightColor, lightIntensity, lightDistance);
scene.add(l5);

var pct = 0;
var pct2 = 0;
function render(){
  pct += cameraSpeed
  pct2 += lightSpeed;
  var pt1 = path.getPointAt(pct%1);
  var pt2 = path.getPointAt((pct + .01)%1);
  camera.position.set(pt1.x,pt1.y,pt1.z);
  camera.lookAt(pt2);
  light.position.set(pt2.x, pt2.y, pt2.z);
  
  l1.position.set(path.getPointAt((pct2+.0)%1).x, path.getPointAt((pct2+.0)%1).y, path.getPointAt((pct2+.0)%1).z);
  l2.position.set(path.getPointAt((pct2+.2)%1).x, path.getPointAt((pct2+.2)%1).y, path.getPointAt((pct2+.2)%1).z);
  l3.position.set(path.getPointAt((pct2+.4)%1).x, path.getPointAt((pct2+.4)%1).y, path.getPointAt((pct2+.4)%1).z);
  l4.position.set(path.getPointAt((pct2+.6)%1).x, path.getPointAt((pct2+.6)%1).y, path.getPointAt((pct2+.6)%1).z);
  l5.position.set(path.getPointAt((pct2+.8)%1).x, path.getPointAt((pct2+.8)%1).y, path.getPointAt((pct2+.8)%1).z);
  
  renderer.render(scene, camera);
  requestAnimationFrame(render);
}
requestAnimationFrame(render);