半球光

作者: Codifier | 来源:发表于2019-11-11 16:57 被阅读0次

半球光
Three.js光源梳理4——半球光（HemisphereLig
活着或死去的
半球
Unity官方教程-Creating Believable Vi
南半球北半球
北半球南半球
七大洲
百日随笔（十九）
立秋

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Hemisphere Light</title>
    <script src="../../three-part/threejs/three.js"></script>
    <script src="../../three-part/utils/stats.min.js"></script>
    <script src="../../three-part/utils/dat.gui.min.js"></script>
    <script src="../controls/TrackballControls.js"></script>
    <script src="../util/util.js"></script>
    <style>
        body {
            margin: 0;
            overflow: hidden;
        }
    </style>
</head>
<body>
<div id="container"></div>
<script type="text/javascript">
    init();
    function init() {
        // show FPS
        let stats = initStats();
        // resize
        window.addEventListener('resize', onResize, false);

        let scene = new THREE.Scene();
        let camera = new THREE.PerspectiveCamera(45, window.innerWidth / window.innerHeight, 0.1, 1000);
        camera.position.x = -30;
        camera.position.y = 40;
        camera.position.z = 30;
        camera.lookAt(scene.position);

        let renderer = new THREE.WebGLRenderer();
        renderer.setClearColor(new THREE.Color(0x000000));
        renderer.setSize(window.innerWidth, window.innerHeight);
        renderer.shadowMap.enabled = true;
        document.getElementById("container").appendChild(renderer.domElement);

        // init trackball control
        let trackballControls = initTrackballControls(camera, renderer);
        let clock = new THREE.Clock();

        // create a plane
        // create texture
        let textureGrass = new THREE.TextureLoader().load("../assets/textures/ground/grasslight-big.jpg");
        textureGrass.wrapS = THREE.RepeatWrapping;
        textureGrass.wrapT = THREE.RepeatWrapping;
        textureGrass.repeat.set(10, 10);

        let planeGeometry = new THREE.PlaneGeometry(1000, 1000, 20, 20);
        let planeMaterial = new THREE.MeshLambertMaterial({
            map: textureGrass
        });
        let plane = new THREE.Mesh(planeGeometry, planeMaterial);
        plane.receiveShadow = true;
        plane.rotation.x = -0.5 * Math.PI;
        plane.position.x = 15;
        plane.position.y = 0;
        plane.position.z = 0;
        scene.add(plane);

        // add hemisphere light
        /**
         * HemisphereLight( skyColor : Integer, groundColor : Integer, intensity : Float )
         * skyColor - (optional) hexadecimal color of the sky. Default is 0xffffff.
         * groundColor - (optional) hexadecimal color of the ground. Default is 0xffffff.
         * intensity - (optional) numeric value of the light's strength/intensity. Default is 1.
         * @type {HemisphereLight}
         */
        let hemiLight = new THREE.HemisphereLight(0xffffff, 0x00ff00, 0.6);
        hemiLight.intensity = 1;
        hemiLight.position.set(0, 500, 0);
        scene.add(hemiLight);

        // create a cube
        let cubeGeometry = new THREE.BoxGeometry(4, 4, 4);
        let cubeMaterial = new THREE.MeshLambertMaterial({
            color: 0xff3333
        });
        let cube = new THREE.Mesh(cubeGeometry, cubeMaterial);
        cube.castShadow = true;
        cube.position.x = -4;
        cube.position.y = 3;
        cube.position.z = 0;
        scene.add(cube);

        // add a sphere
        let sphereGeometry = new THREE.SphereGeometry(4, 25, 25);
        let sphereMaterial = new THREE.MeshPhongMaterial({
            color: 0x7777ff
        });
        let sphere = new THREE.Mesh(sphereGeometry, sphereMaterial);
        sphere.position.x = 10;
        sphere.position.y = 5;
        sphere.position.z = 10;
        sphere.castShadow = true;
        scene.add(sphere);

        // attributes which can be modified in GUI
        const controls = {
            "skyColor" : hemiLight.color.getStyle(),
            "groundColor" : hemiLight.groundColor.getStyle(),
            "intensity" : hemiLight.intensity
        };
        // init GUI
        initGUI();

        renderScene();

        function initGUI(){
            let gui = new dat.GUI();
            gui.addColor(controls, 'skyColor').onChange(function (e) {
                hemiLight.color = new THREE.Color(e);
            });

            gui.addColor(controls, 'groundColor').onChange(function (e) {
                hemiLight.groundColor = new THREE.Color(e);
            });

            gui.add(controls, 'intensity', 0, 5).onChange(function (e) {
                hemiLight.intensity = e;
            });
        }

        function onResize() {
            camera.aspect = window.innerWidth / window.innerHeight;
            camera.updateProjectionMatrix();
            renderer.setSize(window.innerWidth, window.innerHeight);
        }

        function renderScene(){
            trackballControls.update(clock.getDelta());
            stats.update();
            requestAnimationFrame(renderScene);
            renderer.render(scene, camera);
        }
    }
</script>
</body>
</html>

运行结果：