Three JS Tutorial – Raycaster Experiment with three.js

Rengga Dev – Raycaster Experiment with three.js.

// Three JS Template
var renderer = new THREE.WebGLRenderer({antialias:true});
renderer.setSize( window.innerWidth, window.innerHeight );
renderer.shadowMap.enabled = false;
renderer.shadowMap.type = THREE.PCFSoftShadowMap;
renderer.shadowMap.needsUpdate = true;


document.body.appendChild( renderer.domElement );
window.addEventListener('resize', onWindowResize, false);
function onWindowResize() {
  camera.aspect = window.innerWidth / window.innerHeight;
  camera.updateProjectionMatrix();
  renderer.setSize( window.innerWidth, window.innerHeight );
}
var camera = new THREE.PerspectiveCamera( 35, window.innerWidth / window.innerHeight, 1, 500 );
var scene = new THREE.Scene();
var cameraRange = 3;

var setcolor = 0x000000;

scene.background = new THREE.Color(setcolor)
scene.fog = new THREE.Fog(setcolor, 2.5, 3.5);

//-------------------------------------------------------------- SCENE

var sceneGruop = new THREE.Object3D();
var particularGruop = new THREE.Object3D();
var modularGruop = new THREE.Object3D();

function generateParticle(num, amp = 2) {
  var gmaterial = new THREE.MeshPhysicalMaterial({color:0xFFFFFF, side:THREE.DoubleSide});

  var gparticular = new THREE.CircleGeometry(0.2,5);

  for (var i = 1; i < num; i++) {
    var pscale = 0.001+Math.abs(mathRandom(0.03));
    var particular = new THREE.Mesh(gparticular, gmaterial);
    particular.position.set(mathRandom(amp),mathRandom(amp),mathRandom(amp));
    particular.rotation.set(mathRandom(),mathRandom(),mathRandom());
    particular.scale.set(pscale,pscale,pscale);
    particular.speedValue = mathRandom(1);

    particularGruop.add(particular);
  }
}
generateParticle(200, 2);

sceneGruop.add(particularGruop);
scene.add(modularGruop);
scene.add(sceneGruop);

function mathRandom(num = 1) {
  var setNumber = - Math.random() * num + Math.random() * num;
  return setNumber;
}

//------------------------------------------------------------- INIT
function init() {
  for (var i = 0; i<30; i++) {
    var geometry = new THREE.IcosahedronGeometry(1);
    var material = new THREE.MeshStandardMaterial({shading:THREE.FlatShading, color:0x111111, transparent:false, opacity:1, wireframe:false});
    var cube = new THREE.Mesh(geometry, material);
    cube.speedRotation = Math.random() * 0.1;
    cube.positionX = mathRandom();
    cube.positionY = mathRandom();
    cube.positionZ = mathRandom();
    cube.castShadow = true;
    cube.receiveShadow = true;
    
    var newScaleValue = mathRandom(0.3);
    
    cube.scale.set(newScaleValue,newScaleValue,newScaleValue);
    //---
    cube.rotation.x = mathRandom(180 * Math.PI / 180);
    cube.rotation.y = mathRandom(180 * Math.PI / 180);
    cube.rotation.z = mathRandom(180 * Math.PI / 180);
    //
    cube.position.set(cube.positionX, cube.positionY, cube.positionZ);
    modularGruop.add(cube);
  }
}

//------------------------------------------------------------- CAMERA
camera.position.set(0, 0, cameraRange);
var cameraValue = false;
function cameraSet() {
  if (!cameraValue) {
    TweenMax.to(camera.position, 1, {z:cameraRange,ease:Power4.easeInOut});
    cameraValue = true;
  } else {
    TweenMax.to(camera.position, 1, {z:cameraRange,  x:0, y:0, ease:Power4.easeInOut});
    INTERSECTED = null;
    cameraValue = false;
  }
}

//------------------------------------------------------------- SCENE
var ambientLight = new THREE.AmbientLight(0xFFFFFF, 0.1);
//scene.add(ambientLight);

var light = new THREE.SpotLight(0xFFFFFF, 3);
light.position.set(5, 5, 2);
light.castShadow = true;
light.shadow.mapSize.width = 10000;
light.shadow.mapSize.height = light.shadow.mapSize.width;
light.penumbra = 0.5;

var lightBack = new THREE.PointLight(0x0FFFFF, 1);
lightBack.position.set(0, -3, -1);

scene.add(sceneGruop);
scene.add(light);
scene.add(lightBack);

var rectSize = 2;
var intensity = 100;
var rectLight = new THREE.RectAreaLight( 0x0FFFFF, intensity,  rectSize, rectSize );
rectLight.position.set( 0, 0, 1 );
rectLight.lookAt( 0, 0, 0 );
scene.add( rectLight )

rectLightHelper = new THREE.RectAreaLightHelper( rectLight );
//scene.add( rectLightHelper );

//------------------------------------------------------------- RAYCASTER
var raycaster = new THREE.Raycaster();
var mouse = new THREE.Vector2(), INTERSECTED;
var intersected;

function onMouseMove(event) {
  event.preventDefault();
  mouse.x = (event.clientX / window.innerWidth) * 2 - 1;
  mouse.y = -(event.clientY / window.innerHeight) * 2 + 1;
}
function onMouseDown(event) {
  event.preventDefault();
  onMouseMove(event);
  raycaster.setFromCamera(mouse, camera);
  var intersected = raycaster.intersectObjects(modularGruop.children);
  if (intersected.length > 0) {
    cameraValue = false;
    if (INTERSECTED != intersected[0].object) {
      if (INTERSECTED) INTERSECTED.material.emissive.setHex(INTERSECTED.currentHex);
      
      INTERSECTED = intersected[0].object;
      INTERSECTED.currentHex = INTERSECTED.material.emissive.getHex();
      INTERSECTED.material.emissive.setHex(0xFFFF00);
      //INTERSECTED.material.map = null;
      //lightBack.position.set(INTERSECTED.position.x,INTERSECTED.position.y,INTERSECTED.position.z);
      
      TweenMax.to(camera.position, 1, {
        x:INTERSECTED.position.x,
        y:INTERSECTED.position.y,
        z:INTERSECTED.position.z+3,
        ease:Power2.easeInOut
      });
      
    } else {
      if (INTERSECTED) INTERSECTED.material.emissive.setHex(INTERSECTED.currentHex);
      INTERSECTED = null;
      
    }
  }
  console.log(intersected.length);
}
function onMouseUp(event) {
  
}

window.addEventListener('mousedown', onMouseDown, false);
window.addEventListener('mouseup', onMouseUp, false);
window.addEventListener('mousemove', onMouseMove, false);

//------------------------------------------------------------- RENDER
var uSpeed = 0.1;
function animate() {
  var time = performance.now() * 0.0003;
  requestAnimationFrame(animate);
  //---
  for (var i = 0, l = particularGruop.children.length; i<l; i++) {
    var newObject = particularGruop.children[i];
    newObject.rotation.x += newObject.speedValue/10;
    newObject.rotation.y += newObject.speedValue/10;
    newObject.rotation.z += newObject.speedValue/10;
    //---
    //newObject.position.y = Math.sin(time) * 3;
  };
  
  for (var i = 0, l = modularGruop.children.length; i<l; i++) {
    var newCubes = modularGruop.children[i];
    newCubes.rotation.x += 0.008;
    newCubes.rotation.y += 0.005;
    newCubes.rotation.z += 0.003;
    //---
    newCubes.position.x = Math.sin(time * newCubes.positionZ) * newCubes.positionY;
    newCubes.position.y = Math.cos(time * newCubes.positionX) * newCubes.positionZ;
    newCubes.position.z = Math.sin(time * newCubes.positionY) * newCubes.positionX;
  }
  //---
  particularGruop.rotation.y += 0.005;
  //---
  modularGruop.rotation.y -= ((mouse.x * 4) + modularGruop.rotation.y) * uSpeed;
  modularGruop.rotation.x -= ((-mouse.y * 4) + modularGruop.rotation.x) * uSpeed;
  camera.lookAt(scene.position);
  renderer.render( scene, camera );  
}

animate();
init();