Re: Keeping an object's label on the screen
"Monteleone, Nathan" <[email protected]>
| Newsgroups | gmane.games.devel.algorithms |
|---|---|
| Message-ID | <[email protected]> |
Ok thanks. Using the bounding box like that seems a lot faster than trying to analyze an ID buffer. Not worried about overlapping for now :) -----Original Message----- From: Jon Watte [mailto:[email protected]] Sent: Wednesday, April 29, 2009 1:56 PM To: Game Development Algorithms Subject: Re: [Algorithms] Keeping an object's label on the screen Monteleone, Nathan wrote: > > What's a good algorithm to figure out where to draw the label? > In general, this is easy, by projecting the desired location to screen space. However, you can get into situations where a corner is visible on the screen, but the center of the object is behind the camera, which may lead to poorly behaved labels. Just project the corners of the bounding box of the object to screen space; take the average of the corners that are in front of the camera, and project that to screen space. Form the rectangle around that, and clamp that rectangle to screen space to force it onto the screen. If you also want multiple labels to sort themselves out without overlapping, it gets slightly more twisty. Sincerely, jw ------------------------------------------------------------------------ ------ 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-lis t ------------------------------------------------------------------------------ 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