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Re: T-Junctions re-visited
avatarMarch 20, 2013 11:36AM
Quote
Travis Cobbs
You could do something similar with your adjusted vertices. The std::map class uses a balanced binary tree, so has a lookup performance of O( log n ). Insertion is also O( log n ), but the balancing/heap allocation means that actual time to insert is longer than to do lookups. To be honest, I wouldn't know where to start to write a good hash function for a 3D vector to store them in a hash table.

This is the reason I do the unique tests first, because that way I only have to work with the single integer index values for the smoothing and T-Junction fix.

I'm also using pointer lists so insertions only have to move 4 bytes per vertex, instead of 12 or more. It also helps memory fragmentation during all the prep work. When all is done I generate a 'flat' GLfloat array for OpenGL and free all the lookup lists.

The smoothing it self could probably benefit from some additional hash-ed look ups. I was planning to write custom classes for those based on my base list classes. Part of my hobby with LDCad is writing all these support classes my self, so I'm hardly using std::vector etc.
SubjectAuthorViewsPosted
T-Junctions re-visited Travis Cobbs646March 11, 2013 10:38PM
Re: T-Junctions re-visited Tim Gould301March 11, 2013 11:31PM
Re: T-Junctions re-visited Roland Melkert279March 12, 2013 11:17AM
Re: T-Junctions re-visited Ben Supnik286March 12, 2013 11:17AM
Re: T-Junctions re-visited Roland Melkert260March 12, 2013 11:22AM
Re: T-Junctions re-visited Ben Supnik273March 12, 2013 11:32AM
Re: T-Junctions re-visited Roland Melkert261March 12, 2013 11:41AM
Re: T-Junctions re-visited Ben Supnik273March 12, 2013 11:55AM
Re: T-Junctions re-visited Roland Melkert266March 13, 2013 10:08AM
Re: T-Junctions re-visited Travis Cobbs288March 13, 2013 11:27AM
Re: T-Junctions re-visited Allen Smith310March 12, 2013 02:01PM
Re: T-Junctions re-visited Michael Heidemann275March 13, 2013 09:27AM
Re: T-Junctions re-visited Ben Supnik270March 13, 2013 10:37AM
Re: T-Junctions re-visited Tim Gould258March 13, 2013 02:31PM
Re: T-Junctions re-visited Michael Heidemann261March 13, 2013 03:42PM
Re: T-Junctions re-visited Michael Heidemann258March 17, 2013 04:35AM
Re: T-Junctions re-visited Ben Supnik240March 17, 2013 08:43AM
Re: T-Junctions re-visited Michael Heidemann237March 17, 2013 08:59AM
Re: T-Junctions re-visited Ben Supnik247March 17, 2013 09:02AM
Re: T-Junctions re-visited Magnus Forsberg238March 17, 2013 09:15AM
Re: T-Junctions re-visited Travis Cobbs310March 17, 2013 10:09PM
Re: T-Junctions re-visited Ben Supnik267March 18, 2013 07:30AM
Re: T-Junctions re-visited Travis Cobbs277March 18, 2013 10:57AM
Re: T-Junctions re-visited Ben Supnik285March 18, 2013 11:27AM
Re: T-Junctions re-visited Travis Cobbs268March 18, 2013 12:23PM
Re: T-Junctions re-visited Ben Supnik288March 18, 2013 01:41PM
Re: T-Junctions re-visited Roland Melkert296March 18, 2013 02:51PM
Re: T-Junctions re-visited Travis Cobbs268March 18, 2013 02:59PM
Re: T-Junctions re-visited Roland Melkert294March 18, 2013 03:41PM
Re: T-Junctions re-visited Ben Supnik281March 18, 2013 06:09PM
Re: T-Junctions re-visited Roland Melkert287March 19, 2013 11:38AM
Re: T-Junctions re-visited Ben Supnik309March 19, 2013 11:43AM
Re: T-Junctions re-visited Roland Melkert322March 19, 2013 07:07PM
Re: T-Junctions re-visited Travis Cobbs292March 19, 2013 10:13PM
Re: T-Junctions re-visited Tim Gould279March 20, 2013 03:56AM
Re: T-Junctions re-visited Travis Cobbs267March 20, 2013 10:13AM
Re: T-Junctions re-visited Ben Supnik254March 20, 2013 10:23AM
Re: T-Junctions re-visited Travis Cobbs268March 20, 2013 10:29AM
Re: T-Junctions re-visited Travis Cobbs272March 20, 2013 10:26AM
Re: T-Junctions re-visited Ben Supnik250March 20, 2013 11:18AM
Re: T-Junctions re-visited Ben Supnik267March 20, 2013 06:42AM
Re: T-Junctions re-visited Roland Melkert259March 20, 2013 11:36AM
Re: T-Junctions re-visited Philippe Hurbain262March 20, 2013 06:36AM
Re: T-Junctions re-visited Ben Supnik273March 20, 2013 06:58AM
Re: T-Junctions re-visited Allen Smith279March 20, 2013 09:08AM
Re: T-Junctions re-visited Roland Melkert288March 20, 2013 11:35AM
Re: T-Junctions re-visited Ben Supnik672March 20, 2013 11:50AM
Re: T-Junctions re-visited Michael Heidemann285March 18, 2013 03:54PM
Re: T-Junctions re-visited Roland Melkert261March 13, 2013 10:03AM
Re: T-Junctions re-visited Tim Gould243March 13, 2013 03:56PM
Re: T-Junctions re-visited Sergio Reano250March 13, 2013 03:51PM
Re: T-Junctions re-visited Roland Melkert309March 13, 2013 04:36PM
Re: T-Junctions re-visited Tim Gould273March 13, 2013 05:10PM
Re: T-Junctions re-visited Ben Supnik255March 14, 2013 08:17PM
Re: T-Junctions re-visited Tim Gould327March 14, 2013 08:41PM
Re: T-Junctions re-visited Ben Supnik319March 15, 2013 10:56AM
Re: T-Junctions re-visited Roland Melkert270March 15, 2013 11:36AM
Re: T-Junctions re-visited Ben Supnik240March 13, 2013 06:58PM
Re: T-Junctions re-visited Roland Melkert257March 13, 2013 07:27PM
Re: T-Junctions re-visited Ben Supnik239March 13, 2013 07:37PM
Re: T-Junctions re-visited Roland Melkert255March 13, 2013 07:59PM
Re: T-Junctions re-visited Ben Supnik276March 13, 2013 08:18PM
Re: T-Junctions re-visited Travis Cobbs300March 14, 2013 03:23PM
Re: T-Junctions re-visited Roland Melkert311March 14, 2013 03:34PM
Re: T-Junctions re-visited Tim Gould323March 14, 2013 03:41PM
Re: T-Junctions re-visited Roland Melkert291March 15, 2013 11:33AM
Re: T-Junctions re-visited Tim Gould251March 13, 2013 07:43PM
Re: T-Junctions re-visited Roland Melkert250March 13, 2013 08:08PM
Re: T-Junctions re-visited Tim Gould251March 13, 2013 08:18PM
Re: T-Junctions re-visited Ben Supnik316March 14, 2013 08:15PM
Re: T-Junctions re-visited Roland Melkert310March 15, 2013 11:29AM
Re: T-Junctions re-visited Travis Cobbs279March 15, 2013 12:27PM
Re: T-Junctions re-visited Ben Supnik293March 15, 2013 05:08PM
Re: T-Junctions re-visited Travis Cobbs278March 16, 2013 11:29PM
Re: T-Junctions re-visited Ben Supnik236March 17, 2013 08:58AM
Re: T-Junctions re-visited Roland Melkert239March 17, 2013 12:35PM
Re: T-Junctions re-visited Travis Cobbs265March 18, 2013 12:28PM
Re: T-Junctions re-visited Travis Cobbs284March 18, 2013 12:32PM
Re: T-Junctions re-visited Roland Melkert276March 18, 2013 05:00PM
Re: T-Junctions re-visited Travis Cobbs308March 18, 2013 11:05PM
Re: T-Junctions re-visited Roland Melkert331March 19, 2013 11:38AM
Re: T-Junctions re-visited Sergio Reano316March 26, 2013 02:46PM
Re: T-Junctions re-visited Roland Melkert267March 27, 2013 11:19AM
Re: T-Junctions re-visited Sergio Reano317March 27, 2013 01:48PM



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