用cesium本身添加水纹效果

用cesium本身添加水纹效果

参考网站：

1、首先来看一下整体效果

2、具体方法如下：

首先，你必须有两张很重要的图片，你可以从我这里保存为本地

3.具体代码如下

1. var scene=viewer.scene;
2. function applyWaterMaterial(primitive, scene) {
3. primitive.appearance.material = new Cesium.Material({
4. fabric : {
5. type : 'Water',
6. uniforms : {
7. specularMap:'images/earthspec1k.jpg',
8. normalMap:'images/waterNormals.jpg',
9. frequency: 10000.0,
10. animationSpeed: 0.01,
11. amplitude: 1.0
12. }
13. }
14. });
15. }
17. var worldRectangle = viewer.scene.primitives.add(new Cesium.Primitive({
18. geometryInstances : new Cesium.GeometryInstance({
19. geometry : new Cesium.RectangleGeometry({
20. rectangle : Cesium.Rectangle.fromDegrees(-180, -90, 180.0, 90.0),
21. vertexFormat : Cesium.EllipsoidSurfaceAppearance.VERTEX_FORMAT
22. })
23. }),
24. appearance : new Cesium.EllipsoidSurfaceAppearance({
25. aboveGround : true
26. }),
27. show : true
28. }));
30. applyWaterMaterial(worldRectangle, scene);

以上是全球动态水的加载，当然可以针对某片区域水域进行动态水的加载（只需要将上边的矩形换成你要加载动态水区域的边界一系列坐标值）

1. function applydjk_WaterMaterial(primitive, scene) {
2. primitive.appearance.material = new Cesium.Material({
3. fabric : {
4. type : 'Water',
5. uniforms : {
6. normalMap:'images/waterNormals.jpg',
7. frequency: 10000.0,
8. animationSpeed: 0.01,
9. amplitude: 50
10. }
11. }
12. });
13. }
15. var djk_Polygon = viewer.scene.primitives.add(new Cesium.Primitive({
16. geometryInstances : new Cesium.GeometryInstance({
17. geometry : new Cesium.PolygonGeometry({
18. polygonHierarchy : new Cesium.PolygonHierarchy(
19. Cesium.Cartesian3.fromDegreesArray([
20. 111.48894522023063,32.55843610413914,111.48869238776277,32.55602570974643,111.49004745721604,32.5548361448687,111.49250635559537,32.5526581917131,111.49401017612676,32.55129837476868,111.49557557543416,32.549965127681524,111.49805874806115,32.550219820173126,111.49881935514881,32.550823388219456,111.49893286824275,32.55195597852755,111.4983164393889,32.5535655841798,111.49817521853979,32.554570336381104,111.49914284747027,32.55554277243855,111.49967950821859,32.555814392110264,111.50062151969038,32.556517275179836,111.50149914222958,32.55731250438687,111.50207800636986,32.55757396515373,111.50386396090245,32.55781206769338,111.50391371888884,32.559650818164926,111.50077307397399,32.56013340913413,111.49625702141412,32.560250133340446,111.49171532588734,32.560183453792156,111.48920373670329,32.56015020231049,111.48844043918616,32.55981856869106,111.48743657311691,32.55945303779285,111.48760383414758,32.55863069835514,111.48812831262538,32.55837951411848
21. ])
22. ),
23. vertexFormat : Cesium.EllipsoidSurfaceAppearance.VERTEX_FORMAT
24. })
25. }),
26. appearance : new Cesium.EllipsoidSurfaceAppearance({
27. aboveGround : true
28. }),
29. show : true
30. }));
31. applydjk_WaterMaterial(djk_Polygon, scene);

当然，有时获取一系列区域的坐标值数量较多，手动去采集比较麻烦，耗时耗力，推荐一种方法，到Goole earth中画面，然后生成kml文件，里边就包含了你所画区域的边界坐标。（具体做法，可问度娘）

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