Re: Undershooting in spherical harmonics generated by cubemap convolution
Fabian Giesen <[email protected]>
| Newsgroups | gmane.games.devel.algorithms |
|---|---|
| Message-ID | <[email protected]> |
Hi Alen, > So to ask a concrete question: Is it normal for SH approximation > errors in such "spiky" cases to generate undershooting in directions > that are not directly opposite to the brightest point? If you look at the basis functions for l=2: http://web.uniovi.es/qcg/harmonics/harmonics.html you should see what's going on. For first order SH, you will indeed only get undershooting in the opposite direction, since all the functions are point-symmetric around zero. The second order SH basis functions aren't (and their symmetries are rotations by multiplies of 90 degrees, not 180, around the Z axis), so you'll get undershooting in other places too. Kind regards, -Fabian Giesen ------------------------------------------------------------------------------ Register Now & Save for Velocity, the Web Performance & Operations Conference from O'Reilly Media. Velocity features a full day of expert-led, hands-on workshops and two days of sessions from industry leaders in dedicated Performance & Operations tracks. Use code vel09scf and Save an extra 15% before 5/3. http://p.sf.net/sfu/velocityconf _______________________________________________ GDAlgorithms-list mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/gdalgorithms-list Archives: http://sourceforge.net/mailarchive/forum.php?forum_name=gdalgorithms-list