Re: [Algorithms] Cloud Rendering
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Re: [Algorithms] Cloud Rendering
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From: Zafar Q. <zaf...@co...> - 2010-04-13 10:42:39
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I cannot thank you people enough. I really appreciate the time and energy you've all spent in collating and sharing all that info. Hope it helps others too. Very much appreciated. Zafar From: Philip Bai [mailto:phi...@gm...] Sent: 13 April 2010 05:32 To: Game Development Algorithms Subject: Re: [Algorithms] Cloud Rendering Thanks Jim! Really really informative. On Tue, Apr 13, 2010 at 12:54 AM, Jim Drygiannakis <jd...@ma...<mailto:jd...@ma...>> wrote: Hi, Since you are looking for links and ideas I'll drop my two cents (long time following the list, but this is my first post). 1) Cloud layer a) Sky-rendering techniques - GameDev.net forums<http://www.gamedev.net/community/forums/topic.asp?topic_id=86024> : Old thread at gdnet but with some nice ideas. b) Game Programming Gems v5, chapter 5.1, Realistic Cloud Rendering on Modern GPUs : A technique similar to the above thread, but the lighting is performed on the GPU (iirc). 2) 3D clouds a) Interactive multiple anisotropic scattering in clouds<http://www-evasion.imag.fr/Publications/2008/BNMBC08/clouds.pdf> : Really nice looking clouds, but I don't remember any of the details. b) Realistic and Fast Cloud Rendering<http://niniane.org/clouds/> : Used in Flight Simulator 2004. Nice shapes (artist driven), cheap-and-dirty lighting c) Real-time Atmospheric Effects in Games Revisited<http://ati.amd.com/developer/gdc/2007/D3DTutorial_Crytek.pdf> : The above technique as it's used in Crysis. d) Mark Harris' cloud rendering technique<http://www.markmark.net/clouds/index.html> : Pretty old but still really good. Source code included<http://www.markmark.net/SkyWorks/>. I'm sure I had more of those but I unfortunately I haven't added them to my bookmark list. 3) Sky color a) A Practical Analytic Model for Daylight<http://www.cs.utah.edu/%7Eshirley/papers/sunsky/> : Preetham's classic paper. The model is simple but it's quite difficult to configure in order to get nice colors. b) Rendering Outdoor Light Scattering in Real-time<http://ati.amd.com/developer/dx9/ATI-LightScattering.pdf> : A way to implement the above paper using the GPU. c) A Critical Review of the Preetham Skylight Model<http://wscg.zcu.cz/WSCG2007/Papers_2007/short/E59-full.pdf> : What the title says :) d) Display of the Earth Taking into Account Atmospheric Scattering<http://nis-lab.is.s.u-tokyo.ac.jp/%7Enis/cdrom/sig93_nis.pdf> : Another classic paper by Nishita et al. The model might look a bit complex but it gives really nice results. e) Real-time Rendering of Planets with Atmosphere<http://www.vis.uni-stuttgart.de/%7Eschafhts/HomePage/pubs/wscg07-schafhitzel.pdf> : IIRC this describes a way to implement Nishita's method using the GPU. Might worth a read. f) Precomputed Atmospheric Scattering<http://www-ljk.imag.fr/Publications/Basilic/com.lmc.publi.PUBLI_Article@11e7cdda2f7_f64b69/index_en.html> : Really nice implementation of Nishita's method (iirc) on the GPU. Supports multiple scattering and the sun can be moved with no run-time overhead. A bit shader heavy though. Note that you can simplify Nishita's model (and all the derived implementations) a lot if you are not interested in planet rendering. I.e. for an FPS style game you can safely assume that the observer is always at (e.g.) (0, h, 0). That's it. You've probably already read/seen most of those, but you haven't mentioned anything so I tried. Hope the above help you get started. JD On Mon, Apr 12, 2010 at 6:11 PM, Zafar Qamar <zaf...@co...<mailto:zaf...@co...>> wrote: Hi, I'm trying to do some fairly realistic-looking cloud-rendering, in a 3D game. These are the main requirements... 1) Have a high-cloud layer that can range from 0 to full coverage 2) Have lower clouds (sprites) that fade&roll in and out and move around and are "lit by the Sun", so the light can catch edges, and cause the other side to appear in shadow etc. 3) Have colours of the sky change, as the sun rises/sets etc Can anyone suggest any ideas/tips/tricks or links to help me in my quest? Your input would be very much appreciated. Cheers Zaf ********************************************************************************** Disclaimer The information and attached documentation in this e-mail is intended for the use of the addressee only and is confidential. If you are not the intended recipient please delete it and notify us immediately by telephoning or e-mailing the sender. 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