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Tutorials3 Custom Appearance.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, minimum-scale=1, user-scalable=no">
<meta name="description" content="Use Viewer to start building new applications or easily embed Cesium into existing applications.">
<meta name="cesium-sandcastle-labels" content="Beginner, Showcases">
<title>Cesium Demo</title>
<script type="text/javascript" src="../Sandcastle-header.js"></script>
<script type="text/javascript" src="../../../ThirdParty/requirejs-2.1.20/require.js"></script>
<script type="text/javascript">
if (typeof require === "function") {
require.config({
baseUrl: '../../../Source',
waitSeconds: 120
});
}
</script>
</head>
<body class="sandcastle-loading" data-sandcastle-bucket="bucket-requirejs.html">
<style>
@import url(../templates/bucket.css);
</style>
<div id="cesiumContainer" class="fullSize"></div>
<div id="loadingOverlay">
<h1>Loading...</h1>
</div>
<div id="toolbar"></div>
<script id="cesium_sandcastle_script">
function startup(Cesium) {
'use strict';
//Sandcastle_Begin
var viewer = new Cesium.Viewer('cesiumContainer', {
scene3DOnly: true
});
var boxLength = 100000.0;
var position = Cesium.Cartesian3.fromDegrees(116.39, 39.9, 0.5*boxLength);
var modelMatrix = Cesium.Transforms.eastNorthUpToFixedFrame(position);
// 0 立方体顶点位置标号，以及坐标系示意图
// 立方体
// v6----- v5
// /| /|
// v1------v0|
// | | | |
// | |v7---|-|v4
// |/ |/
// v2------v3
// 坐标系
// z
// | /y
// |/
// o------x
// 1 定义位置数组
var v0 = [0.5, -0.5, 0.5];
var v1 = [-0.5, -0.5, 0.5];
var v2 = [-0.5, -0.5, -0.5];
var v3 = [0.5, -0.5, -0.5];
var v4 = [0.5, 0.5, -0.5];
var v5 = [0.5, 0.5, 0.5];
var v6 = [-0.5, 0.5, 0.5];
var v7 = [-0.5, 0.5, -0.5];
var rawVertex = [
// 下 -z
...v2, ...v3, ...v4, ...v7,
// 前 -y
...v2, ...v3, ...v0, ...v1,
// 后 +y
...v4, ...v7, ...v6, ...v5,
// 左 -x
...v7, ...v2, ...v1, ...v6,
// 右 +x
...v3, ...v4, ...v5, ...v0,
// 上 +z
...v1, ...v0, ...v5, ...v6,
];
// 乘上box的长度
var boxVertex = rawVertex.map(function(v) {
return v * boxLength;
});
var positions = new Float64Array(boxVertex);
// 2 定义法向数组
var npx = [1, 0, 0];
var nnx = [-1, 0, 0];
var npy = [0, 1, 0];
var nny = [0, -1, 0];
var npz = [0, 0, 1];
var nnz = [0, 0, -1];
var normals = new Float32Array([
// 下 -z
...nnz, ...nnz, ...nnz, ...nnz,
// 前 -y
...nny, ...nny, ...nny, ...nny,
// 后 +y
...npy, ...npy, ...npy, ...npy,
// 左 -x
...nnx, ...nnx, ...nnx, ...nnx,
// 右 +x
...npx, ...npx, ...npx, ...npx,
// 上 +z
...npz, ...npz, ...npz, ...npz,
]);
// 3 定义纹理数组
var sts = new Float32Array([
0, 0, 1, 0, 1, 1, 0, 1,
0, 0, 1, 0, 1, 1, 0, 1,
0, 0, 1, 0, 1, 1, 0, 1,
0, 0, 1, 0, 1, 1, 0, 1,
0, 0, 1, 0, 1, 1, 0, 1,
0, 0, 1, 0, 1, 1, 0, 1,
]);
// 4 定义索引
var indices = new Uint16Array([
0, 1, 2, 0, 2, 3,
4, 5, 6, 4, 6, 7,
8, 9, 10, 8, 10, 11,
12, 13, 14, 12, 14, 15,
16, 17, 18, 16, 18, 19,
20, 21, 22, 20, 22, 23,
]);
// 5 自定义Appearance
class VtxfAppearance extends Cesium.Appearance {
constructor(options) {
super(options);
options = Cesium.defaultValue(options, Cesium.defaultValue.EMPTY_OBJECT);
var translucent = this.translucent;
var closed = this.closed;
var defaultVertexShader = `
attribute vec3 position3DHigh;
attribute vec3 position3DLow;
attribute vec3 normal;
attribute vec2 st;
attribute float batchId;
varying vec3 v_positionEC;
varying vec3 v_normalEC;
varying vec2 v_st;
void main()
{
vec4 p = czm_computePosition();
v_positionEC = (czm_modelViewRelativeToEye * p).xyz; // position in eye coordinates
v_normalEC = czm_normal * normal; // normal in eye coordinates
v_st = st;
gl_Position = czm_modelViewProjectionRelativeToEye * p;
}
`;
var defaultFragmentShader = `
varying vec3 v_positionEC;
varying vec3 v_normalEC;
varying vec2 v_st;
uniform sampler2D myImage;
void main()
{
vec3 positionToEyeEC = -v_positionEC;
vec3 normalEC = normalize(v_normalEC);
#ifdef FACE_FORWARD
normalEC = faceforward(normalEC, vec3(0.0, 0.0, 1.0), -normalEC);
#endif
czm_materialInput materialInput;
materialInput.normalEC = normalEC;
materialInput.positionToEyeEC = positionToEyeEC;
materialInput.st = v_st;
//czm_material material = czm_getMaterial(materialInput);
czm_material material = czm_getDefaultMaterial(materialInput);
material.diffuse = texture2D(myImage, materialInput.st).rgb;
#ifdef FLAT
gl_FragColor = vec4(material.diffuse + material.emission, material.alpha);
#else
gl_FragColor = czm_phong(normalize(positionToEyeEC), material);
#endif
}
`;
this._vertexShaderSource = Cesium.defaultValue(options.vertexShaderSource, defaultVertexShader);
this._fragmentShaderSource = Cesium.defaultValue(options.fragmentShaderSource, defaultFragmentShader);
this._renderState = Cesium.Appearance.getDefaultRenderState(translucent, closed, options.renderState);
this.uniforms = Cesium.defaultValue(options.uniforms, {});
}
}
var myAppearance = new VtxfAppearance({
//faceForward : true // 当绘制的三角面片法向不能朝向视点时，自动翻转法向，从而避免法向计算后发黑等问题
closed: true, // 是否为封闭体，实际上执行的是是否进行背面裁剪
translucent: false,
uniforms: {
myImage: viewer.scene.context.defaultTexture
}
});
// 5.1 加载纹理
var imageUri = '../../SampleData/models/CesiumBalloon/CesiumBalloonPrint_singleDot.png';
Cesium.Resource.createIfNeeded(imageUri).fetchImage().then(function (image) {
console.log('image loaded!');
var texture;
var context = viewer.scene.context;
if (Cesium.defined(image.internalFormat)) {
texture = new Cesium.Texture({
context : context,
pixelFormat : image.internalFormat,
width : image.width,
height : image.height,
source : {
arrayBufferView : image.bufferView
}
});
} else {
texture = new Cesium.Texture({
context : context,
source : image
});
}
myAppearance.uniforms.myImage = texture;
});
// 6 创建Primitive
var myBox = viewer.scene.primitives.add(new Cesium.Primitive({
geometryInstances: new Cesium.GeometryInstance({
geometry: new Cesium.Geometry({
attributes: {
position: new Cesium.GeometryAttribute({
componentDatatype: Cesium.ComponentDatatype.DOUBLE,
componentsPerAttribute: 3,
values: positions
}),
normal: new Cesium.GeometryAttribute({
componentDatatype: Cesium.ComponentDatatype.FLOAT,
componentsPerAttribute: 3,
values: normals
}),
st: new Cesium.GeometryAttribute({
componentDatatype: Cesium.ComponentDatatype.FLOAT,
componentsPerAttribute: 2,
values: sts
}),
},
indices: indices,
primitiveType: Cesium.PrimitiveType.TRIANGLES,
boundingSphere: Cesium.BoundingSphere.fromVertices(positions)
}),
}),
appearance: myAppearance,
modelMatrix: modelMatrix,
asynchronous: false
}));
viewer.camera.flyToBoundingSphere(new Cesium.BoundingSphere(position, 100000));
//Sandcastle_End
Sandcastle.finishedLoading();
}
if (typeof Cesium !== "undefined") {
startup(Cesium);
} else if (typeof require === "function") {
require(["Cesium"], startup);
}
</script>
</body>
</html>