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threejs-project
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case-053.html

<!DOCTYPE html>
<html>
	<head>
		<title>Threejs实现局部纹理刷新</title>
		<meta charset="UTF-8">
		<script type="text/javascript" src="libs/three.js"></script>
		<!-- <script type="text/javascript" src="libs/OrbitControls.js"></script> -->
		<style>
			body {
				margin: 0;
				overflow: hidden;
			}
		</style>
	</head>
	<body>
		<div id="dom"></div>
		<script type="text/javascript">
			var camera;
			var renderer;
			var mesh = [];

			function init() {
				// 创建一个场景，它将包含我们所有的元素，如物体，相机和灯光。
				var scene = new THREE.Scene();

				// 创建一个摄像机，它定义了我们正在看的地方
				camera = new THREE.PerspectiveCamera(40, window.innerWidth / window.innerHeight, 0.1, 10000);
				camera.position.set(0, 0, 3000);
				// 将摄像机对准场景的中心
				// camera.position.x = 100;
				// camera.position.y = 45;
				// camera.position.z = 65;
				// camera.lookAt(scene.position);
				// var orbit = new THREE.OrbitControls(camera);

				// 创建一个渲染器并设置大小，WebGLRenderer将会使用电脑显卡来渲染场景
				renderer = new THREE.WebGLRenderer({
					antialias: true,
					logarithmicDepthBuffer: true,
				});
				renderer.setSize(window.innerWidth, window.innerHeight);
				// 基础光源，并应用到场景
				scene.add(new THREE.AmbientLight("#ffffff", 1.5));

				// 将呈现器的输出添加到HTML元素
				document.getElementById("dom").appendChild(renderer.domElement);

				// 启动动画
				renderScene();
				initMesh();

				function initMesh() {
					var material = new THREE.MeshBasicMaterial({
						map: new THREE.Texture()
					}); //创建材质
					let sceneBlockModel = {
						sceneWidth: 6912,
						sceneHeight: 3456,
						fileBlockWidth: 1024,
						fileBlockHeight: 512,
						dir: "assets/bgImage/"
					};
					let plane = new THREE.Mesh(new THREE.PlaneGeometry(sceneBlockModel.sceneWidth, sceneBlockModel.sceneHeight),
						material);
					scene.add(plane);
					let img = new Image();
					img.onload = function() {

						let canvas = document.createElement("canvas");
						let ctx = canvas.getContext("2d");

						canvas.width = sceneBlockModel.sceneWidth;
						canvas.height = sceneBlockModel.sceneHeight;

						ctx.drawImage(img, 0, 0, sceneBlockModel.sceneWidth, sceneBlockModel.sceneHeight);

						material.map.image = canvas;
						material.map.minFilter = THREE.LinearFilter;
						material.map.generateMipmaps = false;
						material.map.needsUpdate = true;

						// //加载分块图片
						// let xLen = Math.ceil(sceneBlockModel.sceneWidth / sceneBlockModel.fileBlockWidth);
						// let yLen = Math.ceil(sceneBlockModel.sceneHeight / sceneBlockModel.fileBlockHeight);

						// //延迟三秒开始加载分块图片
						setTimeout(function() {
							let img1 = new Image();
							img1.src = "assets/bgImage/work1.jpg";
							img1.onload = function() {
								console.log(img1)
								// ctx.drawImage(img1, 0, 0, sceneBlockModel.sceneWidth, sceneBlockModel.sceneHeight);
								let position = new THREE.Vector2();
								let texture = new THREE.Texture(img1);
								console.log(position)
								position.x = 1024*3;
								position.y = 512*5;
								renderer.copyTextureToTexture(position, texture, material.map);
							}
						// 	for (let x = 0; x < xLen; x++) {
						// 		for (let y = 0; y < yLen; y++) {
						// 			let img = new Image();
						// 			img.src = sceneBlockModel.dir + x + "_" + y + ".jpg";
						// 			img.onload = function() {

						// 				let texture = new THREE.Texture(img);

						// 				//获取渲染的起始位置
						// 				let position = new THREE.Vector2();

						// 				position.x = y * sceneBlockModel.fileBlockWidth;

						// 				if (x === yLen - 1) {
						// 					position.y = 0;
						// 				} else {
						// 					position.y = (yLen - 2 - x) * sceneBlockModel.fileBlockHeight + (
						// 						sceneBlockModel.sceneHeight % sceneBlockModel.fileBlockHeight
						// 						);
						// 				}

						// 				renderer.copyTextureToTexture(position, texture, material.map);
						// 			}
						// 		}
						// 	}
						}, 3000);
					};

					img.src = sceneBlockModel.dir + "work.jpg";
				}

				function renderScene() {
					// 使用requestAnimationFrame函数进行渲染
					requestAnimationFrame(renderScene);
					renderer.render(scene, camera);
				}

				// 渲染的场景
				renderer.render(scene, camera);
			}
			window.onload = init;

			// 随着窗体的变化修改场景
			function onResize() {
				camera.aspect = window.innerWidth / window.innerHeight;
				camera.updateProjectionMatrix();
				renderer.setSize(window.innerWidth, window.innerHeight);
			}
			// 监听窗体调整大小事件
			window.addEventListener('resize', onResize, false);
		</script>
	</body>
</html>