var viewer = new Cesium.Viewer('cesiumContainer');var waterPrimitive = new Cesium.Primitive({
//show:false,// 默认隐藏
allowPicking:false,
geometryInstances : new Cesium.GeometryInstance({
geometry : new Cesium.PolygonGeometry({
polygonHierarchy : new Cesium.PolygonHierarchy(Cesium.Cartesian3.fromDegreesArrayHeights(waterFace)),//waterFace是一个组成多边形顶点数组[lon,lat,alt]
//extrudedHeight: 0,//注释掉此属性可以只显示水面
perPositionHeight : true//注释掉此属性水面就贴地了
})
}),
// 可以设置内置的水面shader
appearance : new Cesium.EllipsoidSurfaceAppearance({
material : new Cesium.Material({
fabric : {
type : 'Water',
uniforms : {
//baseWaterColor:new Cesium.Color(0.0, 0.0, 1.0, 0.5),
//blendColor: new Cesium.Color(0.0, 0.0, 1.0, 0.5),
//specularMap: 'gray.jpg',
normalMap: 'waterNormals.jpg',
frequency: 1000.0,
animationSpeed: 0.01,
amplitude: 10.0
}
}
}),
fragmentShaderSource:'varying vec3 v_positionMC;\nvarying vec3 v_positionEC;\nvarying vec2 v_st;\nvoid main()\n{\nczm_materialInput materialInput;\nvec3 normalEC = normalize(czm_normal3D * czm_geodeticSurfaceNormal(v_positionMC, vec3(0.0), vec3(1.0)));\n#ifdef FACE_FORWARD\nnormalEC = faceforward(normalEC, vec3(0.0, 0.0, 1.0), -normalEC);\n#endif\nmaterialInput.s = v_st.s;\nmaterialInput.st = v_st;\nmaterialInput.str = vec3(v_st, 0.0);\nmaterialInput.normalEC = normalEC;\nmaterialInput.tangentToEyeMatrix = czm_eastNorthUpToEyeCoordinates(v_positionMC, materialInput.normalEC);\nvec3 positionToEyeEC = -v_positionEC;\nmaterialInput.positionToEyeEC = positionToEyeEC;\nczm_material material = czm_getMaterial(materialInput);\n#ifdef FLAT\ngl_FragColor = vec4(material.diffuse + material.emission, material.alpha);\n#else\ngl_FragColor = czm_phong(normalize(positionToEyeEC), material);\
gl_FragColor.a=0.5;\n#endif\n}\n'//重写shader,修改水面的透明度
})
});water=viewer.scene.primitives.add(waterPrimitive);
Cesium添加水面
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