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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 Cobbs841March 11, 2013 10:38PM
Re: T-Junctions re-visited Tim Gould441March 11, 2013 11:31PM
Re: T-Junctions re-visited Roland Melkert395March 12, 2013 11:17AM
Re: T-Junctions re-visited Ben Supnik413March 12, 2013 11:17AM
Re: T-Junctions re-visited Roland Melkert383March 12, 2013 11:22AM
Re: T-Junctions re-visited Ben Supnik368March 12, 2013 11:32AM
Re: T-Junctions re-visited Roland Melkert361March 12, 2013 11:41AM
Re: T-Junctions re-visited Ben Supnik369March 12, 2013 11:55AM
Re: T-Junctions re-visited Roland Melkert370March 13, 2013 10:08AM
Re: T-Junctions re-visited Travis Cobbs391March 13, 2013 11:27AM
Re: T-Junctions re-visited Allen Smith401March 12, 2013 02:01PM
Re: T-Junctions re-visited Michael Heidemann386March 13, 2013 09:27AM
Re: T-Junctions re-visited Ben Supnik370March 13, 2013 10:37AM
Re: T-Junctions re-visited Tim Gould378March 13, 2013 02:31PM
Re: T-Junctions re-visited Michael Heidemann360March 13, 2013 03:42PM
Re: T-Junctions re-visited Michael Heidemann392March 17, 2013 04:35AM
Re: T-Junctions re-visited Ben Supnik332March 17, 2013 08:43AM
Re: T-Junctions re-visited Michael Heidemann330March 17, 2013 08:59AM
Re: T-Junctions re-visited Ben Supnik320March 17, 2013 09:02AM
Re: T-Junctions re-visited Magnus Forsberg344March 17, 2013 09:15AM
Re: T-Junctions re-visited Travis Cobbs401March 17, 2013 10:09PM
Re: T-Junctions re-visited Ben Supnik367March 18, 2013 07:30AM
Re: T-Junctions re-visited Travis Cobbs358March 18, 2013 10:57AM
Re: T-Junctions re-visited Ben Supnik379March 18, 2013 11:27AM
Re: T-Junctions re-visited Travis Cobbs357March 18, 2013 12:23PM
Re: T-Junctions re-visited Ben Supnik405March 18, 2013 01:41PM
Re: T-Junctions re-visited Roland Melkert424March 18, 2013 02:51PM
Re: T-Junctions re-visited Travis Cobbs394March 18, 2013 02:59PM
Re: T-Junctions re-visited Roland Melkert458March 18, 2013 03:41PM
Re: T-Junctions re-visited Ben Supnik439March 18, 2013 06:09PM
Re: T-Junctions re-visited Roland Melkert393March 19, 2013 11:38AM
Re: T-Junctions re-visited Ben Supnik406March 19, 2013 11:43AM
Re: T-Junctions re-visited Roland Melkert432March 19, 2013 07:07PM
Re: T-Junctions re-visited Travis Cobbs400March 19, 2013 10:13PM
Re: T-Junctions re-visited Tim Gould409March 20, 2013 03:56AM
Re: T-Junctions re-visited Travis Cobbs373March 20, 2013 10:13AM
Re: T-Junctions re-visited Ben Supnik368March 20, 2013 10:23AM
Re: T-Junctions re-visited Travis Cobbs400March 20, 2013 10:29AM
Re: T-Junctions re-visited Travis Cobbs377March 20, 2013 10:26AM
Re: T-Junctions re-visited Ben Supnik358March 20, 2013 11:18AM
Re: T-Junctions re-visited Ben Supnik382March 20, 2013 06:42AM
Re: T-Junctions re-visited Roland Melkert357March 20, 2013 11:36AM
Re: T-Junctions re-visited Philippe Hurbain391March 20, 2013 06:36AM
Re: T-Junctions re-visited Ben Supnik425March 20, 2013 06:58AM
Re: T-Junctions re-visited Allen Smith419March 20, 2013 09:08AM
Re: T-Junctions re-visited Roland Melkert463March 20, 2013 11:35AM
Re: T-Junctions re-visited Ben Supnik889March 20, 2013 11:50AM
Re: T-Junctions re-visited Michael Heidemann428March 18, 2013 03:54PM
Re: T-Junctions re-visited Roland Melkert370March 13, 2013 10:03AM
Re: T-Junctions re-visited Tim Gould337March 13, 2013 03:56PM
Re: T-Junctions re-visited Sergio Reano330March 13, 2013 03:51PM
Re: T-Junctions re-visited Roland Melkert406March 13, 2013 04:36PM
Re: T-Junctions re-visited Tim Gould356March 13, 2013 05:10PM
Re: T-Junctions re-visited Ben Supnik397March 14, 2013 08:17PM
Re: T-Junctions re-visited Tim Gould448March 14, 2013 08:41PM
Re: T-Junctions re-visited Ben Supnik425March 15, 2013 10:56AM
Re: T-Junctions re-visited Roland Melkert376March 15, 2013 11:36AM
Re: T-Junctions re-visited Ben Supnik326March 13, 2013 06:58PM
Re: T-Junctions re-visited Roland Melkert340March 13, 2013 07:27PM
Re: T-Junctions re-visited Ben Supnik330March 13, 2013 07:37PM
Re: T-Junctions re-visited Roland Melkert366March 13, 2013 07:59PM
Re: T-Junctions re-visited Ben Supnik369March 13, 2013 08:18PM
Re: T-Junctions re-visited Travis Cobbs437March 14, 2013 03:23PM
Re: T-Junctions re-visited Roland Melkert448March 14, 2013 03:34PM
Re: T-Junctions re-visited Tim Gould438March 14, 2013 03:41PM
Re: T-Junctions re-visited Roland Melkert424March 15, 2013 11:33AM
Re: T-Junctions re-visited Tim Gould370March 13, 2013 07:43PM
Re: T-Junctions re-visited Roland Melkert351March 13, 2013 08:08PM
Re: T-Junctions re-visited Tim Gould366March 13, 2013 08:18PM
Re: T-Junctions re-visited Ben Supnik441March 14, 2013 08:15PM
Re: T-Junctions re-visited Roland Melkert422March 15, 2013 11:29AM
Re: T-Junctions re-visited Travis Cobbs398March 15, 2013 12:27PM
Re: T-Junctions re-visited Ben Supnik388March 15, 2013 05:08PM
Re: T-Junctions re-visited Travis Cobbs403March 16, 2013 11:29PM
Re: T-Junctions re-visited Ben Supnik318March 17, 2013 08:58AM
Re: T-Junctions re-visited Roland Melkert318March 17, 2013 12:35PM
Re: T-Junctions re-visited Travis Cobbs362March 18, 2013 12:28PM
Re: T-Junctions re-visited Travis Cobbs437March 18, 2013 12:32PM
Re: T-Junctions re-visited Roland Melkert396March 18, 2013 05:00PM
Re: T-Junctions re-visited Travis Cobbs423March 18, 2013 11:05PM
Re: T-Junctions re-visited Roland Melkert480March 19, 2013 11:38AM
Re: T-Junctions re-visited Sergio Reano427March 26, 2013 02:46PM
Re: T-Junctions re-visited Roland Melkert358March 27, 2013 11:19AM
Re: T-Junctions re-visited Sergio Reano453March 27, 2013 01:48PM



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