188 lines
7.6 KiB
HTML
188 lines
7.6 KiB
HTML
<!DOCTYPE html>
|
||
<html lang="en">
|
||
<head>
|
||
<!-- Use correct character set. -->
|
||
<meta charset="utf-8" />
|
||
<!-- Tell IE to use the latest, best version. -->
|
||
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
|
||
<!-- Make the application on mobile take up the full browser screen and disable user scaling. -->
|
||
<meta
|
||
name="viewport"
|
||
content="width=device-width, initial-scale=1, maximum-scale=1, minimum-scale=1, user-scalable=no"
|
||
/>
|
||
<title>Learning Cesium!</title>
|
||
<script src="./Build/Cesium/Cesium.js"></script>
|
||
<style>
|
||
@import url(./Build/Cesium/Widgets/widgets.css);
|
||
html,
|
||
body,
|
||
#cesiumContainer {
|
||
width: 100%;
|
||
height: 100%;
|
||
margin: 0;
|
||
padding: 0;
|
||
overflow: hidden;
|
||
}
|
||
</style>
|
||
</head>
|
||
<body>
|
||
<div id="cesiumContainer"></div>
|
||
<script>
|
||
Cesium.Ion.defaultAccessToken =
|
||
"eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJqdGkiOiI5ZjRjNTZkNC01NDYxLTRhMjQtOGEwZC1kZjA3YzQ5YTJlZDkiLCJpZCI6MjYwODQsInNjb3BlcyI6WyJhc3IiLCJnYyJdLCJpYXQiOjE1ODcxOTMwODN9.prGsSKyAW_9Ow5zHYPhbm3LsQL-ApQw5-5PNJkDaHi8";
|
||
|
||
var viewer = new Cesium.Viewer("cesiumContainer", {
|
||
geocoder: false, //位置查找
|
||
homeButton: false, //视图返回初始位置
|
||
sceneModePicker: false, //视角选择器
|
||
baseLayerPicker: false, //底图选择器
|
||
navigationHelpButton: false, //导航帮助按钮
|
||
animation: false, //动画控制器
|
||
creditContainer: document.createElement("div"), //版权显示
|
||
timeline: false, //时间线
|
||
fullscreenButton: false, //全屏控件
|
||
vrButton: false,
|
||
infoBox: false,
|
||
selectionIndicator: false,
|
||
});
|
||
var scene = viewer.scene;
|
||
var rectangle ;
|
||
createPrimitives(scene);
|
||
|
||
function createPrimitives(scene) {
|
||
rectangle = scene.primitives.add(
|
||
new Cesium.Primitive({
|
||
geometryInstances: new Cesium.GeometryInstance({
|
||
geometry: new Cesium.RectangleGeometry({
|
||
rectangle: Cesium.Rectangle.fromDegrees(116, 39, 117, 39.7),
|
||
|
||
// EllipsoidSurfaceAppearance.VERTEX_FORMAT = Cesium.VertexFormat.POSITION_AND_ST;
|
||
vertexFormat: Cesium.EllipsoidSurfaceAppearance.VERTEX_FORMAT,
|
||
})
|
||
}),
|
||
appearance: new Cesium.EllipsoidSurfaceAppearance({
|
||
aboveGround: false
|
||
})
|
||
})
|
||
)
|
||
rectangle.appearance.material = new Cesium.Material({
|
||
fabric: {
|
||
uniforms: {
|
||
image: './images/53bg.png',
|
||
alpha: 1.0,
|
||
},
|
||
// source: /* glsl
|
||
// texture2D函数是webgl内置函数，传入两个参数，一个是图片，一个是纹理坐标。
|
||
// material.diffuse=texture2D(image,materialInput.st).rgb,获取图片纹素颜色，然后把颜色值给材质的漫反射分量，漫反射代表了材质的颜色，类型是vec3。
|
||
// 图片是在uniforms中定义的变量【uniforms.image: './images/53bg.png'】。
|
||
// 纹理坐标是二维的平面坐标，s轴和t轴垂直大小在0到1之间，（0，0）在左下角。
|
||
// */ `
|
||
// czm_material czm_getMaterial(czm_materialInput materialInput){
|
||
// czm_material material=czm_getDefaultMaterial(materialInput);
|
||
// material.diffuse=texture2D(image,materialInput.st).rgb;
|
||
// return material;
|
||
// }
|
||
// `
|
||
source: /* glsl */ `
|
||
czm_material czm_getMaterial(czm_materialInput materialInput){
|
||
czm_material material=czm_getDefaultMaterial(materialInput);
|
||
material.diffuse=texture2D(image,materialInput.st).rgb;
|
||
material.alpha=alpha;
|
||
vec2 center=vec2(0.5,0.5);
|
||
float dis=distance(center,materialInput.st);
|
||
if(dis>0.25){
|
||
material.diffuse=vec3(0.0);
|
||
}
|
||
if(dis<0.1){
|
||
material.diffuse=vec3(1.0);
|
||
}
|
||
return material;
|
||
}
|
||
`
|
||
}
|
||
})
|
||
}
|
||
|
||
// material 材质，fabric（面料）是Cesium自己定义的一种写材质的一种语法，是一个JSON。
|
||
// GLSL，最灵活的一种定义材质的方式是写GLSL，为Fabric指定source属性，在Cesium源码中会读取source并加工合并到最终的着色器中进行图形绘制。
|
||
/**
|
||
* 在 source 中我们可以使用 webgl 的内置函数,比如step，fract等等，也可直接使用cesium内置函数、变量、结构体等，比如czm_xxxx等。
|
||
* struct czm_materialInput
|
||
{
|
||
float s;
|
||
vec2 st;
|
||
vec3 str;
|
||
mat3 tangentToEyeMatrix;
|
||
vec3 positionToEyeEC;
|
||
vec3 normalEC;
|
||
};
|
||
|
||
struct czm_material
|
||
{
|
||
vec3 diffuse;
|
||
float specular;
|
||
float shininess;
|
||
vec3 normal;
|
||
vec3 emission;
|
||
float alpha;
|
||
};
|
||
|
||
czm_material czm_getMaterial(czm_materialInput materialInput);//返回默认的材质属性
|
||
|
||
最简单的定义如下，这是直接返回默认的材质属性，
|
||
这也是我们写shader的切入点，可以传入uniforms变量，可以从纹理中获取原色，也结合时间变化来动态修改材质等等。
|
||
*/
|
||
const wallGeometry = new Cesium.WallGeometry({
|
||
positions: Cesium.Cartesian3.fromDegreesArrayHeights([
|
||
112, 20.0, 40000.0, 114, 30.0, 40000.0, 115.0, 20.0, 40000.0, 116.0,
|
||
30.0, 40000.0, 117.0, 20.0, 40000.0,
|
||
]),
|
||
});
|
||
const geometry = Cesium.WallGeometry.createGeometry(wallGeometry);
|
||
var wall = new Cesium.Primitive({
|
||
geometryInstances: [
|
||
wallGeometry,
|
||
],
|
||
appearance: new Cesium.MaterialAppearance({
|
||
material: Cesium.Material.fromType('Color'),
|
||
faceForward: true
|
||
})
|
||
})
|
||
|
||
wall.appearance.material = new Cesium.Material({
|
||
fabric: {
|
||
uniforms: {
|
||
color: "vec3(1.0,1.0,0.0)",
|
||
alpha: 1.0,
|
||
image: "/images/colors1.png",
|
||
image2: "/images/colors2.png",
|
||
t: 0.0,
|
||
},
|
||
source: /* glsl */ `
|
||
czm_material czm_getMaterial(czm_materialInput materialInput){
|
||
czm_material material=czm_getDefaultMaterial(materialInput);
|
||
material.diffuse=vec3(1.0,1.0,0.0);
|
||
// material.alpha=fract(1.0-materialInput.st.s+t);
|
||
material.alpha=mod(1.0-materialInput.st.s+t,1.0);
|
||
return material;
|
||
}
|
||
`,
|
||
},
|
||
});
|
||
var position = Cesium.Cartesian3.fromDegrees(
|
||
116.331875,
|
||
39.110038,
|
||
600000
|
||
);
|
||
viewer.camera.setView({
|
||
destination: position,
|
||
orientation: {
|
||
heading: Cesium.Math.toRadians(0.0), //使用弧度的形式
|
||
pitch: Cesium.Math.toRadians(-90.0),
|
||
roll: 0.0,
|
||
},
|
||
});
|
||
</script>
|
||
</body>
|
||
</html>
|