three.js之性能監視器

時間 2019-12-05

原文原文鏈接

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title>Three框架</title>
        <script src="../static/three.js-master/build/three.js"></script>
        <script src="../static/three.js-master/examples/js/libs/stats.min.js"></script>

        <style type="text/css">
            div#canvas-frame {
                border: none;
                cursor: pointer;
                width: 100%;
                height: 600px;
                background-color: #EEEEEE;
            }

        </style>
        <script>
            var renderer;  // 渲染器
            var stats;  // 性能監視器
            function initThree() {
                width = window.innerWidth;
                height = window.innerHeight;
                renderer = new THREE.WebGLRenderer({
                    antialias : true
                });
                renderer.setSize(width, height);
                document.getElementById('canvas-frame').appendChild(renderer.domElement);
                renderer.setClearColor(0xFFFFFF, 1.0);

                stats = new Stats();  // 建立一個性能監視器
                stats.domElement.style.position = 'absolute';  // 樣式， 座標
                stats.domElement.style.left = '0px';
                stats.domElement.style.top = '0px';
                document.getElementById('canvas-frame').appendChild(stats.domElement);  // 添加到canvas-frame
            }

            var camera;  // 攝像機
            function initCamera() {
                camera = new THREE.PerspectiveCamera(45, width / height, 1, 10000);
                camera.position.x = 0;
                camera.position.y = 0;
                camera.position.z = 800;
                camera.up.x = 0;
                camera.up.y = 1;
                camera.up.z = 0;
                camera.lookAt(0, 0, 0);  
            }

            var scene;  // 場景
            function initScene() {
                scene = new THREE.Scene();
            }

            var light;  // 光線
            function initLight() {
                light = new THREE.AmbientLight(0xFF0000);  // 環境光源
                light.position.set(100, 100, 200);
                scene.add(light);
                light = new THREE.PointLight(0x00FF00);  // 點光源
                light.position.set(0, 0,300);
                scene.add(light);
            }

            var mesh;  // 模型
            function initObject() {
                var geometry = new THREE.CylinderGeometry( 100,150,400);  // 構造圓柱體
                var material = new THREE.MeshLambertMaterial( { color:0xFFFFFF} );  // 構造表面
                mesh = new THREE.Mesh( geometry,material);  // 建立模型
                mesh.position = new THREE.Vector3(0,0,0);  
                scene.add(mesh);
            }

            function threeStart() {
                initThree();
                initCamera();
                initScene();
                initLight();
                initObject();
                animation();

            }
            function animation()
            {
                //renderer.clear();
                //camera.position.x =camera.position.x +1;
                mesh.position.x-=1;
                renderer.render(scene, camera);
                requestAnimationFrame(animation);

                stats.update();  // 調用stats.update()函數來統計時間和幀數
            }

        </script>
    </head>

    <body onload="threeStart();">
        <div id="canvas-frame"></div>
    </body>
</html>

性能監視器是three.js裏面的一個類：css

var stats = new Stats();
stats.setMode(1); // 0: fps, 1: ms
// 將stats的界面對應左上角
stats.domElement.style.position = 'absolute';
stats.domElement.style.left = '0px';
stats.domElement.style.top = '0px';
document.body.appendChild( stats.domElement );
setInterval( function () {
    stats.begin();
    // 你的每一幀的代碼
    stats.end();
}, 1000 / 60 );