Visualize wind field(NC file) on Cesium
Home Page: https://cesium-particle.opendde.com/
License: MIT License
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我尝试用这段代码加载一个字段为u, v, x, y的nc文件，但仍会出现这样的报错信息：‘error NetCDF file no such attribute: U
all variables are: x,y,depth,u,v,ocean_time’，Particle3D API中fields的设置似乎并没有生效
particle3D = new Particle3D(viewer, {
input: file,
fields: {
U: 'u',
V: 'v',
lon: 'x',
lat: 'y'
},
colorTable,
userInput
});
你好，在查看demo的时候发现有几个奇怪的渲染表现想请教一下
拖动地球时不隐藏风场，期望跟随地球一起转动，有思路解决吗？
现在的效果是相机高度低于粒子高度时粒子不显示，请问如何让它们显示？
当在viewer中设置请求使用 webgl2 时，场景中不显示粒子了。
cesium 版本1.99，viewer 实例化传入以下参数。
contextOptions: { requestWebGl2: true }
在 cesium 版本1.101 中是这样设置
contextOptions: { requestWebgl1: false }
首先 calculateSpeed.frag 这个文件的第19行报错了，说是全局变量初始化必须是常量表达式
float speedScaleFactor = speedFactor * pixelSize;
将这句注释掉，然后写到对应方法里面去计算，重新打包后渲染不报错了，但是也看不到粒子了。
The algorithm doesn't work well when you are near the 0º (greenwich meridian). When the zoom level is high (you are near the earth), and you are in a zone between the positive and negative values of longitud, you only see the data to the left of the meridian.
这是在正常情况下的截图：
现在移动相机视野，会出现一些粒子被裁剪的情况，如下截图：
如上截图，红色区域以上的屏幕像素的粒子像是被裁剪了一样
预期效果：粒子不被裁剪
个人思考：是不是和深度测试有关系呢，在Wind-Field-Cesium项目中也出现了这个现象
已尝试的几个失败方案：
uniform sampler2D trailsColorTexture;
uniform sampler2D trailsDepthTexture;
varying vec2 textureCoordinate;
void main() {
vec4 trailsColor = texture2D(trailsColorTexture, textureCoordinate);
float trailsDepth = texture2D(trailsDepthTexture, textureCoordinate).r;
float globeDepth = czm_unpackDepth(texture2D(czm_globeDepthTexture, textureCoordinate));
// - 注释掉以下内容
// if (trailsDepth < globeDepth) {
// gl_FragColor = trailsColor;
// } else {
// gl_FragColor = vec4(0.0);
// }
// + 增加以下1行语句
gl_FragColor = trailsColor;
}uniform sampler2D segmentsColorTexture;
uniform sampler2D segmentsDepthTexture;
uniform sampler2D currentTrailsColor;
uniform sampler2D trailsDepthTexture;
uniform float fadeOpacity;
varying vec2 textureCoordinate;
void main() {
vec4 pointsColor = texture2D(segmentsColorTexture, textureCoordinate);
vec4 trailsColor = texture2D(currentTrailsColor, textureCoordinate);
trailsColor = floor(fadeOpacity * 255.0 * trailsColor) / 255.0; // make sure the trailsColor will be strictly decreased
float pointsDepth = texture2D(segmentsDepthTexture, textureCoordinate).r;
float trailsDepth = texture2D(trailsDepthTexture, textureCoordinate).r;
float globeDepth = czm_unpackDepth(texture2D(czm_globeDepthTexture, textureCoordinate));
gl_FragColor = vec4(0.0);
// - 注释掉以下内容
// if (pointsDepth < globeDepth) {
// gl_FragColor = gl_FragColor + pointsColor;
// }
// if (trailsDepth < globeDepth) {
// gl_FragColor = gl_FragColor + trailsColor;
// }
// + 增加以下2行语句
gl_FragColor = gl_FragColor + pointsColor;
gl_FragColor = gl_FragColor + trailsColor;
gl_FragDepthEXT = min(pointsDepth, trailsDepth);
}由于本人刚刚接触webgl不久，烦请忽略我的一些不专业的术语表达。
最近拜读了一下大佬的杰作，发现了一点瑕疵
这个是什么导致的
如题，nc 里面的数据千奇百怪，总觉得哪里不对
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