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iLoveGameProgramming

OpenGL Clouds in OpenGL?

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Hey guys [img]http://public.gamedev.net//public/style_emoticons/default/smile.png[/img]
Well I'm trying to make volumetric clouds but I have no idea where to start.. Does anyone know a good tutorial how to make them or suggest a commercial free library that could achieve that more easily with out spending weeks to code it [img]http://public.gamedev.net//public/style_emoticons/default/tongue.png[/img] Also I don't want anything too cpu intensive... Just something simple [img]http://public.gamedev.net//public/style_emoticons/default/smile.png[/img]

They don't have to be really realistic or anything but I want to fly thought them, and change how dense they are etc.

I've made simple clouds in OpenGl and they look like this:

[img]http://dl.dropbox.com/u/80015266/clouds1.png[/img]

I like how they look, i use perlin noise formula to generate them so they are different each time, and I can adjust how dense they are.. the only problem is that it's just a plane..

[img]http://dl.dropbox.com/u/80015266/cloud%20plane.png[/img]



So I definitely need new approach to this [img]http://public.gamedev.net//public/style_emoticons/default/tongue.png[/img]

Well what I am trying in future is weather system, So i could get rain, thunderstorms etc
Thanks so much for your time and help [img]http://public.gamedev.net//public/style_emoticons/default/biggrin.png[/img]

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larspensjo    1561
Use 3D simplex noise. Although, it is more performance costly. The cost can be reduced using interpolation. Edited by larspensjo

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Waterlimon    4398
You could have it like it is now (maybe some shaders to make it look 3D), and when you get closer use particles and fade the cloud texture away.

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Yours3!f    1532
[url="http://lmgtfy.com/?q=efficient+cloud+rendering"]http://lmgtfy.com/?q...cloud rendering[/url]
>)

or
http://lmgtfy.com/?q=realtime+cloud+rendering Edited by Yours3!f

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Fractal_Vision    112
Hi there. I've been looking into clouds recently, maybe some of the research I've done could guide you towards a solution.

Perhaps the simplest solution is going from 2D to [url="http://stackoverflow.com/questions/6091468/how-is-a-3d-perlin-noise-function-used-to-generate-terrain"]3D Perlin Noise[/url].

I would suggest using billboard sprites as dpadam450 said. I'd recommend reading two papers, [url="http://nis-ei.eng.hokudai.ac.jp/~doba/papers/sig00_cloud.pdf"]"A Simple, Efficient Method for Realistic Animation of Clouds" by Yoshinori Dobashi[/url] (PDF), as he describes a way to represent cloud volumes. The second paper is on the actual billboard sprites, [url="http://www.markmark.net/PDFs/RTClouds_HarrisEG2001.pdf"]"Real-Time Cloud Rendering" by Mark Harris[/url] (PDF).


If you want really nice clouds, try [url="http://wiki.patapom.com/index.php/Clouds"]http://wiki.patapom.com/index.php/Clouds[/url]. It the most extensive documentation on clouds I've found to date, but it is very complex. Good luck.

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