在Cesium中实现
下雨效果，通常可以通过以下步骤：
### 1. 引入Cesium库
首先要确保在HTML文件里引入Cesium库。
```html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, minimum-scale=1, user-scalable=no">
<title>Cesium Rain Effect</title>
<script src="https://cesium.com/downloads/cesiumjs/releases/1.95/Build/Cesium/Cesium.js"></script>
<link href="https://cesium.com/downloads/cesiumjs/releases/1.95/Build/Cesium/Widgets/widgets.css" rel="stylesheet">
</head>
<body>
<div id="cesiumContainer"></div>
<script>
// 后续
代码将放在这里
</script>
</body>
</html>
```
### 2. 创建Cesium Viewer
在JavaScript
代码中创建Cesium Viewer实例。
```javascript
// 初始化Cesium Viewer
var viewer = new Cesium.Viewer('cesiumContainer');
```
### 3. 实现
下雨效果
可以借助自定义材质和粒子系统来实现
下雨效果。以下是一个示例
代码：
```javascript
// 定义
下雨粒子系统
function createRainParticles(viewer) {
var particleSystem = new Cesium.ParticleSystem({
modelMatrix: Cesium.Transforms.eastNorthUpToFixedFrame(
Cesium.Cartesian3.fromDegrees(-75.59777, 40.03883)
),
emitter: new Cesium.CircleEmitter(50.0),
startColor: Cesium.Color.AQUA.withAlpha(0.7),
endColor: Cesium.Color.WHITE.withAlpha(0.3),
startScale: 1.0,
endScale: 3.0,
minimumParticleLife: 0.5,
maximumParticleLife: 1.5,
minimumSpeed: 10.0,
maximumSpeed: 20.0,
image: 'https://cesium.com/downloads/cesiumjs/releases/1.95/Build/Cesium/Assets/Textures/particle.png',
emissionRate: 1000,
lifetime: 10000,
loop: true
});
viewer.scene.primitives.add(particleSystem);
}
// 调用函数创建
下雨效果
createRainParticles(viewer);
```
### 完整
代码示例
```html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, minimum-scale=1, user-scalable=no">
<title>Cesium Rain Effect</title>
<script src="https://cesium.com/downloads/cesiumjs/releases/1.95/Build/Cesium/Cesium.js"></script>
<link href="https://cesium.com/downloads/cesiumjs/releases/1.95/Build/Cesium/Widgets/widgets.css" rel="stylesheet">
</head>
<body>
<div id="cesiumContainer"></div>
<script>
// 初始化Cesium Viewer
var viewer = new Cesium.Viewer('cesiumContainer');
// 定义
下雨粒子系统
function createRainParticles(viewer) {
var particleSystem = new Cesium.ParticleSystem({
modelMatrix: Cesium.Transforms.eastNorthUpToFixedFrame(
Cesium.Cartesian3.fromDegrees(-75.59777, 40.03883)
),
emitter: new Cesium.CircleEmitter(50.0),
startColor: Cesium.Color.AQUA.withAlpha(0.7),
endColor: Cesium.Color.WHITE.withAlpha(0.3),
startScale: 1.0,
endScale: 3.0,
minimumParticleLife: 0.5,
maximumParticleLife: 1.5,
minimumSpeed: 10.0,
maximumSpeed: 20.0,
image: 'https://cesium.com/downloads/cesiumjs/releases/1.95/Build/Cesium/Assets/Textures/particle.png',
emissionRate: 1000,
lifetime: 10000,
loop: true
});
viewer.scene.primitives.add(particleSystem);
}
// 调用函数创建
下雨效果
createRainParticles(viewer);
</script>
</body>
</html>
```
通过以上步骤，就能在Cesium中实现
下雨效果。可以依据需求对粒子系统的参数进行调整，从而达到不同的
下雨效果。
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