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 - Voxel Geometry - Merged</title>
    <style>
    body {
        margin: 0;
    }
    #c {
        width: 100vw;
        height: 100vh;
        display: block;
    }
    </style>
  </head>
  <body>
    <canvas id="c"></canvas>
  </body>
<script src="resources/threejs/r105/three.min.js"></script>
<script src="resources/threejs/r105/js/utils/BufferGeometryUtils.js"></script>
<script src="resources/threejs/r105/js/controls/OrbitControls.js"></script>
<script>
'use strict';

/* global THREE */

function main() {
  const canvas = document.querySelector('#c');
  const renderer = new THREE.WebGLRenderer({canvas});

  const cellSize = 256;

  const fov = 75;
  const aspect = 2;  // the canvas default
  const near = 0.1;
  const far = 1000;
  const camera = new THREE.PerspectiveCamera(fov, aspect, near, far);
  camera.position.set(cellSize / 2, 60, cellSize);

  const controls = new THREE.OrbitControls(camera, canvas);
  controls.target.set(cellSize / 2, 60, cellSize / 2);
  controls.update();

  const scene = new THREE.Scene();
  scene.background = new THREE.Color('lightblue');

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

  const geometries = [];
  for (let y = 0; y < cellSize; ++y) {
    for (let z = 0; z < cellSize; ++z) {
      for (let x = 0; x < cellSize; ++x) {
        const height = (Math.sin(x / cellSize * Math.PI * 4) + Math.sin(z / cellSize * Math.PI * 6)) * 20 + 60;
        //if (y < height) {
        if (height > y && height < y + 1) {
          const geometry = new THREE.BoxBufferGeometry(1, 1, 1);
          geometry.applyMatrix((new THREE.Matrix4()).makeTranslation(x, y, z));
          geometries.push(geometry);
        }
      }
    }
  }

  const mergedGeometry = THREE.BufferGeometryUtils.mergeBufferGeometries(
        geometries, false);
  const material = new THREE.MeshPhongMaterial({color: 'green'});
  const mesh = new THREE.Mesh(mergedGeometry, material);
  scene.add(mesh);

  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;
  }

  let renderRequested = false;

  function render() {
    renderRequested = undefined;

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

    controls.update();
    renderer.render(scene, camera);
  }
  render();

  function requestRenderIfNotRequested() {
    if (!renderRequested) {
      renderRequested = true;
      requestAnimationFrame(render);
    }
  }

  controls.addEventListener('change', requestRenderIfNotRequested);
  window.addEventListener('resize', requestRenderIfNotRequested);
}

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