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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 Cobbs887March 11, 2013 10:38PM
Re: T-Junctions re-visited Tim Gould468March 11, 2013 11:31PM
Re: T-Junctions re-visited Roland Melkert413March 12, 2013 11:17AM
Re: T-Junctions re-visited Ben Supnik425March 12, 2013 11:17AM
Re: T-Junctions re-visited Roland Melkert400March 12, 2013 11:22AM
Re: T-Junctions re-visited Ben Supnik382March 12, 2013 11:32AM
Re: T-Junctions re-visited Roland Melkert375March 12, 2013 11:41AM
Re: T-Junctions re-visited Ben Supnik384March 12, 2013 11:55AM
Re: T-Junctions re-visited Roland Melkert382March 13, 2013 10:08AM
Re: T-Junctions re-visited Travis Cobbs405March 13, 2013 11:27AM
Re: T-Junctions re-visited Allen Smith413March 12, 2013 02:01PM
Re: T-Junctions re-visited Michael Heidemann400March 13, 2013 09:27AM
Re: T-Junctions re-visited Ben Supnik380March 13, 2013 10:37AM
Re: T-Junctions re-visited Tim Gould390March 13, 2013 02:31PM
Re: T-Junctions re-visited Michael Heidemann371March 13, 2013 03:42PM
Re: T-Junctions re-visited Michael Heidemann401March 17, 2013 04:35AM
Re: T-Junctions re-visited Ben Supnik342March 17, 2013 08:43AM
Re: T-Junctions re-visited Michael Heidemann341March 17, 2013 08:59AM
Re: T-Junctions re-visited Ben Supnik333March 17, 2013 09:02AM
Re: T-Junctions re-visited Magnus Forsberg355March 17, 2013 09:15AM
Re: T-Junctions re-visited Travis Cobbs419March 17, 2013 10:09PM
Re: T-Junctions re-visited Ben Supnik383March 18, 2013 07:30AM
Re: T-Junctions re-visited Travis Cobbs381March 18, 2013 10:57AM
Re: T-Junctions re-visited Ben Supnik392March 18, 2013 11:27AM
Re: T-Junctions re-visited Travis Cobbs366March 18, 2013 12:23PM
Re: T-Junctions re-visited Ben Supnik427March 18, 2013 01:41PM
Re: T-Junctions re-visited Roland Melkert443March 18, 2013 02:51PM
Re: T-Junctions re-visited Travis Cobbs415March 18, 2013 02:59PM
Re: T-Junctions re-visited Roland Melkert479March 18, 2013 03:41PM
Re: T-Junctions re-visited Ben Supnik471March 18, 2013 06:09PM
Re: T-Junctions re-visited Roland Melkert412March 19, 2013 11:38AM
Re: T-Junctions re-visited Ben Supnik430March 19, 2013 11:43AM
Re: T-Junctions re-visited Roland Melkert453March 19, 2013 07:07PM
Re: T-Junctions re-visited Travis Cobbs426March 19, 2013 10:13PM
Re: T-Junctions re-visited Tim Gould431March 20, 2013 03:56AM
Re: T-Junctions re-visited Travis Cobbs393March 20, 2013 10:13AM
Re: T-Junctions re-visited Ben Supnik391March 20, 2013 10:23AM
Re: T-Junctions re-visited Travis Cobbs423March 20, 2013 10:29AM
Re: T-Junctions re-visited Travis Cobbs396March 20, 2013 10:26AM
Re: T-Junctions re-visited Ben Supnik375March 20, 2013 11:18AM
Re: T-Junctions re-visited Ben Supnik399March 20, 2013 06:42AM
Re: T-Junctions re-visited Roland Melkert375March 20, 2013 11:36AM
Re: T-Junctions re-visited Philippe Hurbain401March 20, 2013 06:36AM
Re: T-Junctions re-visited Ben Supnik442March 20, 2013 06:58AM
Re: T-Junctions re-visited Allen Smith442March 20, 2013 09:08AM
Re: T-Junctions re-visited Roland Melkert496March 20, 2013 11:35AM
Re: T-Junctions re-visited Ben Supnik918March 20, 2013 11:50AM
Re: T-Junctions re-visited Michael Heidemann450March 18, 2013 03:54PM
Re: T-Junctions re-visited Roland Melkert384March 13, 2013 10:03AM
Re: T-Junctions re-visited Tim Gould347March 13, 2013 03:56PM
Re: T-Junctions re-visited Sergio Reano340March 13, 2013 03:51PM
Re: T-Junctions re-visited Roland Melkert420March 13, 2013 04:36PM
Re: T-Junctions re-visited Tim Gould373March 13, 2013 05:10PM
Re: T-Junctions re-visited Ben Supnik417March 14, 2013 08:17PM
Re: T-Junctions re-visited Tim Gould474March 14, 2013 08:41PM
Re: T-Junctions re-visited Ben Supnik440March 15, 2013 10:56AM
Re: T-Junctions re-visited Roland Melkert387March 15, 2013 11:36AM
Re: T-Junctions re-visited Ben Supnik340March 13, 2013 06:58PM
Re: T-Junctions re-visited Roland Melkert349March 13, 2013 07:27PM
Re: T-Junctions re-visited Ben Supnik339March 13, 2013 07:37PM
Re: T-Junctions re-visited Roland Melkert388March 13, 2013 07:59PM
Re: T-Junctions re-visited Ben Supnik394March 13, 2013 08:18PM
Re: T-Junctions re-visited Travis Cobbs459March 14, 2013 03:23PM
Re: T-Junctions re-visited Roland Melkert470March 14, 2013 03:34PM
Re: T-Junctions re-visited Tim Gould459March 14, 2013 03:41PM
Re: T-Junctions re-visited Roland Melkert435March 15, 2013 11:33AM
Re: T-Junctions re-visited Tim Gould376March 13, 2013 07:43PM
Re: T-Junctions re-visited Roland Melkert368March 13, 2013 08:08PM
Re: T-Junctions re-visited Tim Gould387March 13, 2013 08:18PM
Re: T-Junctions re-visited Ben Supnik465March 14, 2013 08:15PM
Re: T-Junctions re-visited Roland Melkert437March 15, 2013 11:29AM
Re: T-Junctions re-visited Travis Cobbs419March 15, 2013 12:27PM
Re: T-Junctions re-visited Ben Supnik403March 15, 2013 05:08PM
Re: T-Junctions re-visited Travis Cobbs424March 16, 2013 11:29PM
Re: T-Junctions re-visited Ben Supnik341March 17, 2013 08:58AM
Re: T-Junctions re-visited Roland Melkert329March 17, 2013 12:35PM
Re: T-Junctions re-visited Travis Cobbs372March 18, 2013 12:28PM
Re: T-Junctions re-visited Travis Cobbs459March 18, 2013 12:32PM
Re: T-Junctions re-visited Roland Melkert417March 18, 2013 05:00PM
Re: T-Junctions re-visited Travis Cobbs443March 18, 2013 11:05PM
Re: T-Junctions re-visited Roland Melkert506March 19, 2013 11:38AM
Re: T-Junctions re-visited Sergio Reano447March 26, 2013 02:46PM
Re: T-Junctions re-visited Roland Melkert371March 27, 2013 11:19AM
Re: T-Junctions re-visited Sergio Reano472March 27, 2013 01:48PM



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