我努力了几天，我的代码有什么问题吗？ Three.js 不更新灯光。我的帮助将得到赞赏，这可能会解决我的问题。
我尝试了以下代码的多种组合，但没有取得任何成功。
function LightFunc(Light){
scene.remove(spotLight1);
scene.remove(spotLight2);
cubeMaterial.needsUpdate=true;
planeMaterial.needsUpdate=true;
if (document.getElementById('Light1').checked) {
spotLight1 = new THREE.SpotLight(0xffffff);
spotLight1.position.set(15,30,50);
spotLight1.castShadow = true;
scene.add(spotLight1);
}
if (document.getElementById('Light2').checked) {
spotLight2 = new THREE.SpotLight(0xffffff);
spotLight2.position.set(15,30,-50);
spotLight2.castShadow = true;
scene.add(spotLight2);
}
}
// step1: how to create scene
var scene = new THREE.Scene();
// step2: how to create camera
var camera = new THREE.PerspectiveCamera(45, 4/3, .1, 500)
camera.position.set(40,40,40);
camera.lookAt(scene.position);
// step3: how to create renderer
var renderer = new THREE.WebGLRenderer();
renderer.setClearColor(0xdddddd);
renderer.setSize(800, 600);
renderer.shadowMap.enabled = true;
renderer.shadowMap.type = THREE.PCFSoftShadowMap;
// step4: how to create axis
var axis = new THREE.AxesHelper(10);
scene.add(axis);
// step5: how to create color
var color = new THREE.Color("rgb(255, 0, 0)");
// step6: how to create grid
var grid = new THREE.GridHelper(50,5,color,0x000000);
scene.add(grid);
// step7: how to create cube
var cubeGeo = new THREE.BoxGeometry(5,5,5);
var cubeMaterial = new THREE.MeshLambertMaterial({color:0xff3300});
var cube = new THREE.Mesh(cubeGeo,cubeMaterial);
cube.position.set(2.5,2.5,2.5);
cube.castShadow = true;
cube.receiveShadow = false;
scene.add(cube);
// step8: how to create plane
var planeGeo = new THREE.PlaneGeometry(30,30,30);
var planeMaterial = new THREE.MeshLambertMaterial({color:0x00ff00});
var plane = new THREE.Mesh(planeGeo,planeMaterial);
plane.rotation.x = -.5*Math.PI;
plane.receiveShadow = true;
scene.add(plane);
// step9: how to create spot lights
var spotLight1 = new THREE.SpotLight(0xffffff);
spotLight1.position.set(15,30,50);
spotLight1.castShadow = true;
scene.add(spotLight1);
var spotLight2 = new THREE.SpotLight(0xffffff);
spotLight2.position.set(15,30,-50);
spotLight2.castShadow = true;
scene.add(spotLight2);
var canvas = document.getElementById("canvas");
canvas.appendChild(renderer.domElement);
renderer.render(scene,camera);<html>
<script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/r123/three.min.js"></script>
<body>
<div id="canvas" width="800px" height="600px"></div>
<div>
<input type="checkbox" id="Light1" name="Light1" value="Light1" onchange="LightFunc();" checked >
<label for="Light1"> Light1</label><br>
<input type="checkbox" id="Light2" name="Light2" value="Light2" onchange="LightFunc();" checked >
<label for="Light2"> Light2</label><br>
</div>
</body>
</html>我努力了几天，我的代码有什么问题吗？ Three.js 不更新灯光。我的帮助将得到赞赏，这可能会解决我的问题。
我尝试了以下代码的多种组合，但没有取得任何成功。
最佳答案
由于场景中没有动画循环，因此在更改灯光设置时必须重新渲染它。
function LightFunc(Light){
scene.remove(spotLight1);
scene.remove(spotLight2);
cubeMaterial.needsUpdate=true;
planeMaterial.needsUpdate=true;
if (document.getElementById('Light1').checked) {
spotLight1 = new THREE.SpotLight(0xffffff);
spotLight1.position.set(15,30,50);
spotLight1.castShadow = true;
scene.add(spotLight1);
}
if (document.getElementById('Light2').checked) {
spotLight2 = new THREE.SpotLight(0xffffff);
spotLight2.position.set(15,30,-50);
spotLight2.castShadow = true;
scene.add(spotLight2);
}
renderer.render(scene,camera); // FIX
}
// step1: how to create scene
var scene = new THREE.Scene();
// step2: how to create camera
var camera = new THREE.PerspectiveCamera(45, 4/3, .1, 500)
camera.position.set(40,40,40);
camera.lookAt(scene.position);
// step3: how to create renderer
var renderer = new THREE.WebGLRenderer();
renderer.setClearColor(0xdddddd);
renderer.setSize(800, 600);
renderer.shadowMap.enabled = true;
renderer.shadowMap.type = THREE.PCFSoftShadowMap;
// step4: how to create axis
var axis = new THREE.AxesHelper(10);
scene.add(axis);
// step5: how to create color
var color = new THREE.Color("rgb(255, 0, 0)");
// step6: how to create grid
var grid = new THREE.GridHelper(50,5,color,0x000000);
scene.add(grid);
// step7: how to create cube
var cubeGeo = new THREE.BoxGeometry(5,5,5);
var cubeMaterial = new THREE.MeshLambertMaterial({color:0xff3300});
var cube = new THREE.Mesh(cubeGeo,cubeMaterial);
cube.position.set(2.5,2.5,2.5);
cube.castShadow = true;
cube.receiveShadow = false;
scene.add(cube);
// step8: how to create plane
var planeGeo = new THREE.PlaneGeometry(30,30,30);
var planeMaterial = new THREE.MeshLambertMaterial({color:0x00ff00});
var plane = new THREE.Mesh(planeGeo,planeMaterial);
plane.rotation.x = -.5*Math.PI;
plane.receiveShadow = true;
scene.add(plane);
// step9: how to create spot lights
var spotLight1 = new THREE.SpotLight(0xffffff);
spotLight1.position.set(15,30,50);
spotLight1.castShadow = true;
scene.add(spotLight1);
var spotLight2 = new THREE.SpotLight(0xffffff);
spotLight2.position.set(15,30,-50);
spotLight2.castShadow = true;
scene.add(spotLight2);
var canvas = document.getElementById("canvas");
canvas.appendChild(renderer.domElement);
renderer.render(scene,camera);<html>
<script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/r123/three.min.js"></script>
<body>
<div id="canvas" width="800px" height="600px"></div>
<div>
<input type="checkbox" id="Light1" name="Light1" value="Light1" onchange="LightFunc();" checked >
<label for="Light1"> Light1</label><br>
<input type="checkbox" id="Light2" name="Light2" value="Light2" onchange="LightFunc();" checked >
<label for="Light2"> Light2</label><br>
</div>
</body>
</html>关于Three.js:如何在运行时添加和删除灯光？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/65172836/