tag:blogger.com,1999:blog-263327529581652713.post1728463818760864735..comments2023-05-19T10:42:24.071-05:00Comments on Solid Angle: A Production Irradiance Volume Implementation DescribedStevehttp://www.blogger.com/profile/15315525780089168677noreply@blogger.comBlogger5125tag:blogger.com,1999:blog-263327529581652713.post-1200620142724057092010-02-21T13:17:20.221-06:002010-02-21T13:17:20.221-06:00It was a very cool lighting system. Would have bee...It was a very cool lighting system. Would have been nice to see it ship.Davehttps://www.blogger.com/profile/11525469292693874182noreply@blogger.comtag:blogger.com,1999:blog-263327529581652713.post-34088893931923809372009-12-06T10:50:01.856-06:002009-12-06T10:50:01.856-06:00Oops, corrected the link.
The ringing was mostly ...Oops, corrected the link.<br /><br />The ringing was mostly due to occasional high frequency lighting. <br /><br />The windowing function I implemented was minimizing the squared Laplacian described in PPS's paper in the "Minimizing a Functional" section and in appendices A6 and A7. The math for it seems a little intimidating at first but once you sit down and work through it, it is actually pretty straightforward. I liked it because the lambda parameter (curvature) can be exposed to the artists in a semi-intuitive way (or at least, mapped easily enough to a 0..1 range for them representing the "amount" of smoothing).Stevehttps://www.blogger.com/profile/15315525780089168677noreply@blogger.comtag:blogger.com,1999:blog-263327529581652713.post-42063301645875535552009-12-06T06:42:40.556-06:002009-12-06T06:42:40.556-06:00Oops, forgot to mention that yor link to 'Stup...Oops, forgot to mention that yor link to 'Stupid Spherical Harmonic Tricks' is actually a link to 'Beast' :)rotogluphttps://www.blogger.com/profile/15688884816193838150noreply@blogger.comtag:blogger.com,1999:blog-263327529581652713.post-33435849581160011852009-12-06T06:41:33.723-06:002009-12-06T06:41:33.723-06:00Thanks for the interesting insight ! I've been...Thanks for the interesting insight ! I've been recently having ringing artifacts in 9-coef SHs due to some relatively high frequency HDR lighting variations.<br /><br />Due to lack of time, I could not investigate SH windowing, and could not find any obvious information on this point. I found the Peter Pike Sloan paper quite elusive. Could you share more information about how you actually windowed your SH?<br /><br />In my case, I actually 'solved' (or postponed) my ringing problem by encoding the lighting as 'log(1+light)' in my SHs, and having an 'exp' in my fragment program.<br /><br />Were your ringing artifacts mainly due to HDR lighting information, or high frequency lighting?rotogluphttps://www.blogger.com/profile/15688884816193838150noreply@blogger.comtag:blogger.com,1999:blog-263327529581652713.post-50399239772566590512009-12-05T10:35:43.796-06:002009-12-05T10:35:43.796-06:00It's a good system. We're still using it...It's a good system. We're still using it for some of the lighting (along with some new sexiness) in the new projects.Jon Greenberghttps://www.blogger.com/profile/16814548913372678156noreply@blogger.com