Fog とは？ †
遠くの物体の彩度を落とすことによって、霧がかかっているように見せる手法
やり方
物体の material の属性に fog : true を設定
// 形状
var cubeGeometry = new THREE.CubeGeometry(1,1,1);
// テクスチャを作成
var texture = new THREE.Texture(hilbert(100, 100, 3, 'black', 'lime'));
texture.needsUpdate = true;
// 色
var cubeMaterial = new THREE.MeshPhongMaterial({
map : texture,
fog: true
});
var cube = new THREE.Mesh(cubeGeometry, cubeMaterial);
scene に Fog または FogExp2 オブジェクトを追加する
var scene = new THREE.Scene();
scene.fog = new THREE.FogExp2(0x000020, 0.1);
scene.add(cube);
scene.add(light);
scene.add(alight);
new THREE.FogExp2( hex, density)
hex : 色
density : 密度
どこから霧が始まるかの制御はできないが、適当にうまいことやってくれる
new THREE.Fog( hex, near, far )
hex : 色
near : 霧の開始
far : 霧の終了
あくまでもオブジェクトごとに霧がかかる。大きなオブジェクトの途中から霧がかかることはない サンプルアプリ †
Your borwser is not supporting object tag. Please use one of the latest browsers./ThreeJSExam/Hilbert3D_no_fog.html
Your borwser is not supporting object tag. Please use one of the latest browsers./ThreeJSExam/Hilbert3D.html
<!DOCTYPE html>
<html lang="ja">
<head>
<meta charset="utf-8">
<title>Hilbert 3D Cube</title>
<style>
div {
border : 1px solid;
}
</style>
</head>
<body>
Fog
<div id="webgl_view"></div>
<script type="text/javascript" src="three.js" charset="utf-8"></script>
<script type="text/javascript" src="Hilbert.js" charset="utf-8"></script>
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/2.0.3/jquery.min.js"></script>
<script>
var height = 240;
var width = 320;
var container = $('#webgl_view');
container.css({
height : height + "px",
width : width + "px"});
function cource(t) {
return {
x : 10.0 * Math.cos(t),
y : 2.0 * Math.sin(t),
z : 10.0 * Math.sin(t * 2),
dx : -10.0 * Math.sin(t),
dy : 2.0 * Math.cos(t),
dz : 10.0 * Math.cos(t * 2),
};
}
// (1) 立方体
// 形状
var cubeGeometry = new THREE.CubeGeometry(1,1,1);
// テクスチャを作成
var texture = new THREE.Texture(hilbert(100, 100, 3, 'black', 'lime'));
texture.needsUpdate = true;
// 色
var cubeMaterial = new THREE.MeshPhongMaterial({
map : texture,
fog: true
});
var cubeArray = new Array();
for (var t = 0; t < 2 * Math.PI; t += 0.1) {
var cube = new THREE.Mesh(cubeGeometry, cubeMaterial);
var position = cource(t);
cube.position.x = position.x;
cube.position.y = position.y;
cube.position.z = position.z;
cube.rotation.y = Math.atan(position.x/position.z);
cubeArray.push(cube);
}
// (2) ライト（平行光) : (0,10,10)が光源ではなく、(0,10,10)方向無限遠方からの平行光
var light = new THREE.DirectionalLight(0xffffff);
light.position.x = 0;
light.position.y = 10;
light.position.z = 10;
// (3) 環境光
var alight = new THREE.AmbientLight(0x404040);
// (4) Scene
var scene = new THREE.Scene();
for (var cnt = 0 ; cnt < cubeArray.length; cnt++ ) {
scene.add(cubeArray[cnt]);
}
scene.add(light);
scene.add(alight);
scene.fog = new THREE.FogExp2(0x000020, 0.1);
// (5) Camera (視野角, アスペクト比(縦横比), 描画対象(最小距離), 描画対象(最大距離)
var camera = new THREE.PerspectiveCamera(90, width/height, 0.1, 100);
// (6) WebGL Renderer
var renderer = new THREE.WebGLRenderer();
renderer.setSize(width, height);
renderer.setClearColor(0x000000);
renderer.clear(true);
container.append(renderer.domElement);
// (7) Animation (Rotate)
function animation() {
var time = (new Date()).getTime();
var position = cource(time / 5000);
camera.position.x = position.x;
camera.position.y = position.y + 1.0;
camera.position.z = position.z;
camera.lookAt(new THREE.Vector3(position.dx, position.dy, position.dz));
renderer.render(scene, camera);
requestAnimationFrame(animation);
}
animation();
</script>
</body>
</html>HTML
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