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Reverse Reprojection

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hi,

Are there any examples or tutorials about Reverse Reprojection ?

Whether this method is used in making any game?

Thanks.

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I've never used it nor do I know of any games that use it. You'd think it would be more popular because if you cach correctly, you don't have to render new data every frame and everything can be calculated per vertex not at the pixel level. All this adds up to a faster framerate for shadows, motion blurs and DOF. There has to be a caveat somewhere.

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Do you mean reverse reprojection caches, to optimise pixel shading costs?
I'm not aware of any games that use this in general, but AFAIK, it's been used specifically for temporal-anti-aliasing, and SSAO.
Can't remember exactly where I saw those examples... maybe Crytek and Epic?

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[quote]
I've never used it nor do I know of any games that use it. You'd think it would be more popular because if you cach correctly, you don't have to render new data every frame and everything can be calculated per vertex not at the pixel level. All this adds up to a faster framerate for shadows, motion blurs and DOF. There has to be a caveat somewhere.
[/quote]
Yes i know.
[quote]
Do you mean reverse reprojection caches, to optimise pixel shading costs?
[/quote]
Yes exactly.
[quote]
Can't remember exactly where I saw those examples... maybe Crytek and Epic?
[/quote]
i think u are right .

GPU pro 2 has a chapter in global Illumination effect with name of "Temporal screen-space ambient occlusion" that using Reverse reprojection but it is too abstract and complex to understanding.
And also in game engine gems 2 , chapter 7 "a spatial and temporal coherence framework for real time graphics" describes more than gpu pro but still it is so complex! Edited by hossainiir

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i found a post in gamedev but seems it has been removed,the title of this post is "Accumulative Screen Space Ambient Occlusion" and also the link is :
[url="http://www.gamedev.net/community/forums/profile.asp?mode=display&id=144762"]http://www.gamedev.net/community/forums/profile.asp?mode=display&id=144762[/url]
how can i access to this post?

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Ah, it seems that post was part of the old site's IOTD system: http://archive.gamedev.net/archive/community/forums/galleryf8b1.html?forum_id=62&whichpage=22&pagesize=28
Unfortunately, I think we lost all of the old IOTD posts during the site upgrade...

You could try and contact the author via their [url="http://www.gamedev.net/user/144762-mtlung/"]profile here[/url], [url="http://www.youtube.com/watch?v=MFkF4PcOAug"]youtube[/url], or [url="http://mtlung.blogspot.com"]their blog[/url].

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Thanks, i found this post in his or her blog, and link is :
[url="http://mtlung.blogspot.com/2009/03/accumulative-screen-space-ambient.html"]http://mtlung.blogspot.com/2009/03/accumulative-screen-space-ambient.html[/url]

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