javascript
/
three.js
mirror of https://github.com/tazdij/three.js.git


			
				
					
						
						
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							<!-- Licensed under a BSD license. See license.html for license -->
<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
    <title>Three.js - WebVR - Point to Select</title>
    <style>
    body {
        margin: 0;
    }
    #c {
        width: 100vw;
        height: 100vh;
        display: block;
    }
    </style>
  </head>
  <body>
    <canvas id="c"></canvas>
  </body>
<script type="module">
import * as THREE from './resources/threejs/r114/build/three.module.js';
import {VRButton} from './resources/threejs/r114/examples/jsm/webxr/VRButton.js';

function main() {
  const canvas = document.querySelector('#c');
  const renderer = new THREE.WebGLRenderer({canvas});
  renderer.xr.enabled = true;
  document.body.appendChild(VRButton.createButton(renderer));

  const fov = 75;
  const aspect = 2;  // the canvas default
  const near = 0.1;
  const far = 50;
  const camera = new THREE.PerspectiveCamera(fov, aspect, near, far);
  camera.position.set(0, 1.6, 0);

  const scene = new THREE.Scene();
  {
    const loader = new THREE.CubeTextureLoader();
    const texture = loader.load([
      'resources/images/grid-1024.png',
      'resources/images/grid-1024.png',
      'resources/images/grid-1024.png',
      'resources/images/grid-1024.png',
      'resources/images/grid-1024.png',
      'resources/images/grid-1024.png',
    ]);
    scene.background = texture;
  }

  {
    const color = 0xFFFFFF;
    const intensity = 1;
    const light = new THREE.DirectionalLight(color, intensity);
    light.position.set(-1, 2, 4);
    scene.add(light);
  }

  const boxWidth = 1;
  const boxHeight = 1;
  const boxDepth = 1;
  const boxGeometry = new THREE.BoxBufferGeometry(boxWidth, boxHeight, boxDepth);

  const sphereRadius = 0.5;
  const sphereGeometry = new THREE.SphereBufferGeometry(sphereRadius);

  function makeInstance(geometry, color, x) {
    const material = new THREE.MeshPhongMaterial({color});

    const cube = new THREE.Mesh(geometry, material);
    scene.add(cube);

    cube.position.x = x;
    cube.position.y = 1.6;
    cube.position.z = -2;

    return cube;
  }

  const meshToMeshMap = new Map();
  [
    { x:  0, boxColor: 0x44aa88, sphereColor: 0xFF4444, },
    { x:  2, boxColor: 0x8844aa, sphereColor: 0x44FF44, },
    { x: -2, boxColor: 0xaa8844, sphereColor: 0x4444FF, },
  ].forEach((info) => {
    const {x, boxColor, sphereColor} = info;
    const sphere = makeInstance(sphereGeometry, sphereColor, x);
    const box = makeInstance(boxGeometry, boxColor, x);
    // hide the sphere
    sphere.visible = false;
    // map the sphere to the box
    meshToMeshMap.set(box, sphere);
    // map the box to the sphere
    meshToMeshMap.set(sphere, box);
  });

  class ControllerPickHelper extends THREE.EventDispatcher {
    constructor(scene) {
      super();
      this.raycaster = new THREE.Raycaster();
      this.objectToColorMap = new Map();
      this.controllerToObjectMap = new Map();
      this.tempMatrix = new THREE.Matrix4();

      const pointerGeometry = new THREE.BufferGeometry().setFromPoints([
        new THREE.Vector3(0, 0, 0),
        new THREE.Vector3(0, 0, -1),
      ]);

      this.controllers = [];
      for (let i = 0; i < 2; ++i) {
        const controller = renderer.xr.getController(i);
        controller.addEventListener('select', (event) => {
          const controller = event.target;
          const selectedObject = this.controllerToObjectMap.get(controller);
          if (selectedObject) {
            this.dispatchEvent({type: 'select', controller, selectedObject});
          }
        });
        scene.add(controller);

        const line = new THREE.Line(pointerGeometry);
        line.scale.z = 5;
        controller.add(line);
        this.controllers.push({controller, line});
      }
    }
    reset() {
      // restore the colors
      this.objectToColorMap.forEach((color, object) => {
        object.material.emissive.setHex(color);
      });
      this.objectToColorMap.clear();
      this.controllerToObjectMap.clear();
    }
    update(scene, time) {
      this.reset();
      for (const {controller, line} of this.controllers) {
        // cast a ray through the from the controller
        this.tempMatrix.identity().extractRotation(controller.matrixWorld);
        this.raycaster.ray.origin.setFromMatrixPosition(controller.matrixWorld);
        this.raycaster.ray.direction.set(0, 0, -1).applyMatrix4(this.tempMatrix);
        // get the list of objects the ray intersected
        const intersections = this.raycaster.intersectObjects(scene.children);
        if (intersections.length) {
          const intersection = intersections[0];
          // make the line touch the object
          line.scale.z = intersection.distance;
          // pick the first object. It's the closest one
          const pickedObject = intersection.object;
          // save which object this controller picked
          this.controllerToObjectMap.set(controller, pickedObject);
          // highlight the object if we haven't already
          if (this.objectToColorMap.get(pickedObject) === undefined) {
            // save its color
            this.objectToColorMap.set(pickedObject, pickedObject.material.emissive.getHex());
            // set its emissive color to flashing red/yellow
            pickedObject.material.emissive.setHex((time * 8) % 2 > 1 ? 0xFF2000 : 0xFF0000);
          }
        } else {
          line.scale.z = 5;
        }
      }
    }
  }

  const pickHelper = new ControllerPickHelper(scene);
  pickHelper.addEventListener('select', (event) => {
    event.selectedObject.visible = false;
    const partnerObject = meshToMeshMap.get(event.selectedObject);
    partnerObject.visible = true;
  });

  function resizeRendererToDisplaySize(renderer) {
    const canvas = renderer.domElement;
    const width = canvas.clientWidth;
    const height = canvas.clientHeight;
    const needResize = canvas.width !== width || canvas.height !== height;
    if (needResize) {
      renderer.setSize(width, height, false);
    }
    return needResize;
  }

  function render(time) {
    time *= 0.001;

    if (resizeRendererToDisplaySize(renderer)) {
      const canvas = renderer.domElement;
      camera.aspect = canvas.clientWidth / canvas.clientHeight;
      camera.updateProjectionMatrix();
    }

    let ndx = 0;
    for (const mesh of meshToMeshMap.keys()) {
      const speed = 1 + ndx * .1;
      const rot = time * speed;
      mesh.rotation.x = rot;
      mesh.rotation.y = rot;
      ++ndx;
    }

    pickHelper.update(scene, time);

    renderer.render(scene, camera);
  }

  renderer.setAnimationLoop(render);
}

main();
</script>
</html>