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Tutorials2 Custom Material.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 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)
}),
// attributes : {
// color : Cesium.ColorGeometryInstanceAttribute.fromColor(new Cesium.Color(1.0, 1.0, 0.0, 1.0))
// }
}),
// appearance: new Cesium.PerInstanceColorAppearance({
// flat : true,
// translucent : false
// }),
appearance: new Cesium.MaterialAppearance({
material: Cesium.Material.fromType('Image', {
image: '../../SampleData/models/CesiumBalloon/CesiumBalloonPrint_singleDot.png'
}),
//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
}),
modelMatrix: modelMatrix,
asynchronous: false
}));
viewer.camera.flyToBoundingSphere(new Cesium.BoundingSphere(position, 100000));
// 6 创建material
// 6.1 创建纯色material
var colorMaterial = new Cesium.Material({
fabric: {
type: 'Color',
uniforms: {
color: new Cesium.Color(1.0, 1.0, 0.0, 1.0)
},
components: {
diffuse: 'color.bgr',
alpha: 'color.a'
}
},
translucent: false
});
// 6.2 创建图像material
var imageMaterial = new Cesium.Material({
fabric: {
type: 'Image',
uniforms: {
image: '../../SampleData/models/CesiumBalloon/CesiumBalloonPrint_singleDot.png',
repeat: new Cesium.Cartesian2(1.0, 1.0),
color: new Cesium.Color(1.0, 1.0, 1.0, 1.0)
},
components: {
diffuse: 'texture2D(image, fract(repeat * materialInput.st)).rgb * color.rgb',
alpha: 'texture2D(image, fract(repeat * materialInput.st)).a * color.a'
}
},
translucent: false
});
// 6.3 创建组合material
// Material创建几个material来组合使用，以下其写法
var compositeMaterial = new Cesium.Material({
fabric: {
type: 'OurMappedPlastic',
materials: {
diffuseMaterial: {
type: 'DiffuseMap',
uniforms: {
image: '../../SampleData/models/CesiumBalloon/CesiumBalloonPrint_singleDot.png'
}
},
alphaMap: {
type: 'AlphaMap',
uniforms: {
image: '../../SampleData/models/CesiumBalloon/FlameGrate.png',
channel: 'r'
}
}
},
components: {
diffuse: 'diffuseMaterial.diffuse',
// specular: 'specularMaterial.specular',
// alpha: 'diffuseMaterial.diffuse.g',
alpha: 'alphaMap.alpha * 3.0',
},
},
translucent: function(material) {
// return material.uniforms.color.alpha < 1.0;
return false;
}
});
// 6.4 创建自定义shader的material
// 模拟纯色到图像的过渡过程
var customMaterial = new Cesium.Material({
fabric: {
type: 'MyCustomShader1',
uniforms: {
image: '../../SampleData/models/CesiumBalloon/CesiumBalloonPrint_singleDot.png',
color: new Cesium.Color(1.0, 1.0, 0.0, 1.0),
cellAlpha: 0.3
},
source: `
uniform vec4 color;
uniform float cellAlpha;
czm_material czm_getMaterial(czm_materialInput materialInput)
{
czm_material material = czm_getDefaultMaterial(materialInput);
vec2 st = materialInput.st;
float aa = st.s * st.t;
vec3 halfColor = color.rgb * aa + texture2D(image, materialInput.st).rgb * (1.0 - aa);
halfColor *= 0.5;
material.diffuse = halfColor;
material.emission = halfColor;
// material.alpha = color.a * aa;
material.alpha = 1.0;
return material;
}
`
},
translucent: false
});
var options = [{
text: '使用纯色材质',
onselect: function() {
myBox.appearance.material = colorMaterial;
}
}, {
text: '使用图像材质',
onselect: function() {
myBox.appearance.material = imageMaterial;
}
}, {
text: '使用组合材质',
onselect: function() {
myBox.appearance.material = compositeMaterial;
}
}, {
text: '自定义Shader材质',
onselect: function() {
myBox.appearance.material = customMaterial;
}
}];
Sandcastle.addToolbarMenu(options);
//Sandcastle_End
Sandcastle.finishedLoading();
}
if (typeof Cesium !== "undefined") {
startup(Cesium);
} else if (typeof require === "function") {
require(["Cesium"], startup);
}
</script>
</body>
</html>