3D-Wind-Field
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RaymanNg
About learning algorithm
Hello,dear author. Recently I am studying your algorithm in demo, but due to the limited level, I can't understand some algorithm . Could you please tell me which algorithms are used in this demo? I want to study this demo further. Thanks any way!
I have written some comment about the algorithm I used in the GLSL code. The key algorithms I used are listed below:
- Bilinear interpolation https://en.wikipedia.org/wiki/Bilinear_interpolation
- Runge Kutta second order https://en.wikipedia.org/wiki/Runge%E2%80%93Kutta_methods#Second-order_methods_with_two_stages
- unit conversion: meters -> longitude latitude degrees https://en.wikipedia.org/wiki/Geographic_coordinate_system#Length_of_a_degree
- WGS84 (lon, lat, lev) -> ECEF (x, y, z) https://en.wikipedia.org/wiki/Geographic_coordinate_conversion#From_geodetic_to_ECEF_coordinates
P.S. It might be better if you ask about a specified algorithm you don't understand so that I can give you a more helpful answer
Hello，dear author. Could you explain to me why use the convert Coordinate algorithm( WGS84 (lon, lat, lev) -> ECEF (x, y, z) )? I have a question, can the particle position be directly expressed in latlonlev? Thank you very much for your guidance.
Could you explain to me why use the convert Coordinate algorithm( WGS84 (lon, lat, lev) -> ECEF (x, y, z) )?
The coordinate system of WebGL is Cartesian coordinate system, not WGS84, I have to convert WGS84 to XYZ for rendering
can the particle position be directly expressed in latlonlev?
I am afraid not, you have to render with the coordinate system of WebGL
Can I convert the coordinate system to a two-dimensional Cartesian coordinate system? If so, could you provide me with an algorithm formula?
------------------ 原始邮件 ------------------ 发件人: "RaymanNg/3D-Wind-Field" <[email protected]>; 发送时间: 2020年12月17日(星期四) 上午9:10 收件人: "RaymanNg/3D-Wind-Field"<[email protected]>; 抄送: "啥也不会的小菜鸟"<[email protected]>;"Author"<[email protected]>; 主题: Re: [RaymanNg/3D-Wind-Field] About learning algorithm (#52)
Could you explain to me why use the convert Coordinate algorithm( WGS84 (lon, lat, lev) -> ECEF (x, y, z) )?
The coordinate system of WebGL is Cartesian coordinate system, not WGS84, I have to convert WGS84 to XYZ for rendering
can the particle position be directly expressed in latlonlev?
I am afraid not, you have to render with the coordinate system of WebGL
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Can I convert the coordinate system to a two-dimensional Cartesian coordinate system?
Could you elaborate your question? From which coordinate system you want to convert to 2D Cartesian coordinate system? And why converting to 2D? 2D is just a special case of 3D.
sorry，I didn't describe it clearly。 Firstly，I am trying whether this demo can be converted into a 2D wind field。 So, I thought about converting the wgs84 coordinate system in webgl into a 2D coordinate system. See what the result looks like。 Could you give me some suggestions?
Thank you anyway！ ------------------ 原始邮件 ------------------ 发件人: "RaymanNg/3D-Wind-Field" <[email protected]>; 发送时间: 2020年12月17日(星期四) 晚上6:15 收件人: "RaymanNg/3D-Wind-Field"<[email protected]>; 抄送: "啥也不会的小菜鸟"<[email protected]>;"Author"<[email protected]>; 主题: Re: [RaymanNg/3D-Wind-Field] About learning algorithm (#52)
Can I convert the coordinate system to a two-dimensional Cartesian coordinate system?
Could you elaborate your question? From which coordinate system you want to convert to 2D Cartesian coordinate system? And why converting to 2D? 2D is just a special case of 3D.
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What do you mean by 2D wind field? To draw particle trails on the surface of the Earth?
Achieve a 2D wind field effect------------------ 原始邮件 ------------------ 发件人: "Rayman"<[email protected]> 发送时间: 2020年12月18日(星期五) 下午4:25 收件人: "RaymanNg/3D-Wind-Field"<[email protected]>; 抄送: "Rookiemin"<[email protected]>;"Author"<[email protected]>; 主题: Re: [RaymanNg/3D-Wind-Field] About learning algorithm (#52)
Did you mean render 2D map like this example?
If so, then this is unfortunately not supported by this demo for the moment, you may refer to issue #18 to get some detail.
Could you explain in detail why that effect cannot be achieved?
------------------ 原始邮件 ------------------ 发件人: "RaymanNg/3D-Wind-Field" <[email protected]>; 发送时间: 2020年12月21日(星期一) 晚上10:40 收件人: "RaymanNg/3D-Wind-Field"<[email protected]>; 抄送: "啥也不会的小菜鸟"<[email protected]>;"Author"<[email protected]>; 主题: Re: [RaymanNg/3D-Wind-Field] About learning algorithm (#52)
Did you mean render 2D map like this example?
If so, then this is unfortunately not supported by this demo for the moment, you may refer to issue #18 to get some detail.
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I am afraid not, because I am not familiar with 2D rendering of Cesium. All I know is that 2D rendering of Cesium is quite different from that of 3D. I suggest that you should seek for help in Cesium Forum