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Visualize wind field on Cesium

Results 31 3D-Wind-Field issues
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The effect now is that the particles don't show up when the camera is below their height. How Do I get them to show up?

help wanted

![image](https://user-images.githubusercontent.com/93416203/139518338-4ba3ed3e-725b-4058-bc9d-c5b4120322ff.png) why does it run out the rectangle scope? "xmin": 112.298, "xmax": 120.316, "ymax": 33.426, "ymin": 27.75, Now its latitude min value is below 27 and even is

Why do some strange particles appear when the line width is set to 20,It looks like it is caused by the generateRandomParticle method in the postProcessingPosition file,I don't know how...

help wanted

![image](https://user-images.githubusercontent.com/3302276/137586835-57cf2f02-fd4a-4b0f-945b-5ddf98858143.png)

help wanted

I found out that the colors are defined in file segmentDraw.frag but can only be defined as a solid color. Is there a way to define gradient colors to different...

help wanted

Thank you for this great project. And I want to know the wind field can be displayed clamp to ground? like the following picture.

enhancement

![1619601867(1)](https://user-images.githubusercontent.com/47777818/116381040-1b5a9e00-a847-11eb-8948-128f32f7ec31.jpg) When UV value is 0 show these pieces. How can I solve this issue? Thank you!

help wanted

Hi Rayman, I'm trying to decide wich tool I'll use to show wind particles in my Cesium. I have found [this ](https://github.com/YanzheZhang/Cesium.HPUZYZ.Demo/tree/master/Cesium1.43/MyDemos/Libs/wind )and yours. Your tool is fast and pretty,...

help wanted

With the zoom of the viewport, there are many irregular quadrilaterals. What is the reason? ![粗线](https://user-images.githubusercontent.com/38279196/104837013-d8566980-58ec-11eb-9f87-f2bbe96152f1.JPG)

bug
help wanted