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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 Cobbs586March 11, 2013 10:38PM
Re: T-Junctions re-visited Tim Gould262March 11, 2013 11:31PM
Re: T-Junctions re-visited Roland Melkert247March 12, 2013 11:17AM
Re: T-Junctions re-visited Ben Supnik250March 12, 2013 11:17AM
Re: T-Junctions re-visited Roland Melkert238March 12, 2013 11:22AM
Re: T-Junctions re-visited Ben Supnik238March 12, 2013 11:32AM
Re: T-Junctions re-visited Roland Melkert230March 12, 2013 11:41AM
Re: T-Junctions re-visited Ben Supnik240March 12, 2013 11:55AM
Re: T-Junctions re-visited Roland Melkert233March 13, 2013 10:08AM
Re: T-Junctions re-visited Travis Cobbs255March 13, 2013 11:27AM
Re: T-Junctions re-visited Allen Smith282March 12, 2013 02:01PM
Re: T-Junctions re-visited Michael Heidemann240March 13, 2013 09:27AM
Re: T-Junctions re-visited Ben Supnik240March 13, 2013 10:37AM
Re: T-Junctions re-visited Tim Gould232March 13, 2013 02:31PM
Re: T-Junctions re-visited Michael Heidemann231March 13, 2013 03:42PM
Re: T-Junctions re-visited Michael Heidemann218March 17, 2013 04:35AM
Re: T-Junctions re-visited Ben Supnik207March 17, 2013 08:43AM
Re: T-Junctions re-visited Michael Heidemann206March 17, 2013 08:59AM
Re: T-Junctions re-visited Ben Supnik217March 17, 2013 09:02AM
Re: T-Junctions re-visited Magnus Forsberg210March 17, 2013 09:15AM
Re: T-Junctions re-visited Travis Cobbs247March 17, 2013 10:09PM
Re: T-Junctions re-visited Ben Supnik233March 18, 2013 07:30AM
Re: T-Junctions re-visited Travis Cobbs247March 18, 2013 10:57AM
Re: T-Junctions re-visited Ben Supnik250March 18, 2013 11:27AM
Re: T-Junctions re-visited Travis Cobbs238March 18, 2013 12:23PM
Re: T-Junctions re-visited Ben Supnik254March 18, 2013 01:41PM
Re: T-Junctions re-visited Roland Melkert260March 18, 2013 02:51PM
Re: T-Junctions re-visited Travis Cobbs231March 18, 2013 02:59PM
Re: T-Junctions re-visited Roland Melkert246March 18, 2013 03:41PM
Re: T-Junctions re-visited Ben Supnik249March 18, 2013 06:09PM
Re: T-Junctions re-visited Roland Melkert246March 19, 2013 11:38AM
Re: T-Junctions re-visited Ben Supnik264March 19, 2013 11:43AM
Re: T-Junctions re-visited Roland Melkert285March 19, 2013 07:07PM
Re: T-Junctions re-visited Travis Cobbs254March 19, 2013 10:13PM
Re: T-Junctions re-visited Tim Gould245March 20, 2013 03:56AM
Re: T-Junctions re-visited Travis Cobbs228March 20, 2013 10:13AM
Re: T-Junctions re-visited Ben Supnik219March 20, 2013 10:23AM
Re: T-Junctions re-visited Travis Cobbs233March 20, 2013 10:29AM
Re: T-Junctions re-visited Travis Cobbs228March 20, 2013 10:26AM
Re: T-Junctions re-visited Ben Supnik213March 20, 2013 11:18AM
Re: T-Junctions re-visited Ben Supnik231March 20, 2013 06:42AM
Re: T-Junctions re-visited Roland Melkert234March 20, 2013 11:36AM
Re: T-Junctions re-visited Philippe Hurbain235March 20, 2013 06:36AM
Re: T-Junctions re-visited Ben Supnik237March 20, 2013 06:58AM
Re: T-Junctions re-visited Allen Smith241March 20, 2013 09:08AM
Re: T-Junctions re-visited Roland Melkert252March 20, 2013 11:35AM
Re: T-Junctions re-visited Ben Supnik623March 20, 2013 11:50AM
Re: T-Junctions re-visited Michael Heidemann252March 18, 2013 03:54PM
Re: T-Junctions re-visited Roland Melkert236March 13, 2013 10:03AM
Re: T-Junctions re-visited Tim Gould212March 13, 2013 03:56PM
Re: T-Junctions re-visited Sergio Reano217March 13, 2013 03:51PM
Re: T-Junctions re-visited Roland Melkert275March 13, 2013 04:36PM
Re: T-Junctions re-visited Tim Gould241March 13, 2013 05:10PM
Re: T-Junctions re-visited Ben Supnik222March 14, 2013 08:17PM
Re: T-Junctions re-visited Tim Gould282March 14, 2013 08:41PM
Re: T-Junctions re-visited Ben Supnik278March 15, 2013 10:56AM
Re: T-Junctions re-visited Roland Melkert236March 15, 2013 11:36AM
Re: T-Junctions re-visited Ben Supnik215March 13, 2013 06:58PM
Re: T-Junctions re-visited Roland Melkert225March 13, 2013 07:27PM
Re: T-Junctions re-visited Ben Supnik202March 13, 2013 07:37PM
Re: T-Junctions re-visited Roland Melkert220March 13, 2013 07:59PM
Re: T-Junctions re-visited Ben Supnik244March 13, 2013 08:18PM
Re: T-Junctions re-visited Travis Cobbs267March 14, 2013 03:23PM
Re: T-Junctions re-visited Roland Melkert274March 14, 2013 03:34PM
Re: T-Junctions re-visited Tim Gould289March 14, 2013 03:41PM
Re: T-Junctions re-visited Roland Melkert248March 15, 2013 11:33AM
Re: T-Junctions re-visited Tim Gould205March 13, 2013 07:43PM
Re: T-Junctions re-visited Roland Melkert219March 13, 2013 08:08PM
Re: T-Junctions re-visited Tim Gould219March 13, 2013 08:18PM
Re: T-Junctions re-visited Ben Supnik282March 14, 2013 08:15PM
Re: T-Junctions re-visited Roland Melkert268March 15, 2013 11:29AM
Re: T-Junctions re-visited Travis Cobbs242March 15, 2013 12:27PM
Re: T-Junctions re-visited Ben Supnik256March 15, 2013 05:08PM
Re: T-Junctions re-visited Travis Cobbs244March 16, 2013 11:29PM
Re: T-Junctions re-visited Ben Supnik205March 17, 2013 08:58AM
Re: T-Junctions re-visited Roland Melkert210March 17, 2013 12:35PM
Re: T-Junctions re-visited Travis Cobbs233March 18, 2013 12:28PM
Re: T-Junctions re-visited Travis Cobbs250March 18, 2013 12:32PM
Re: T-Junctions re-visited Roland Melkert250March 18, 2013 05:00PM
Re: T-Junctions re-visited Travis Cobbs273March 18, 2013 11:05PM
Re: T-Junctions re-visited Roland Melkert293March 19, 2013 11:38AM
Re: T-Junctions re-visited Sergio Reano282March 26, 2013 02:46PM
Re: T-Junctions re-visited Roland Melkert231March 27, 2013 11:19AM
Re: T-Junctions re-visited Sergio Reano285March 27, 2013 01:48PM



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