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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 Cobbs595March 11, 2013 10:38PM
Re: T-Junctions re-visited Tim Gould275March 11, 2013 11:31PM
Re: T-Junctions re-visited Roland Melkert251March 12, 2013 11:17AM
Re: T-Junctions re-visited Ben Supnik262March 12, 2013 11:17AM
Re: T-Junctions re-visited Roland Melkert242March 12, 2013 11:22AM
Re: T-Junctions re-visited Ben Supnik243March 12, 2013 11:32AM
Re: T-Junctions re-visited Roland Melkert239March 12, 2013 11:41AM
Re: T-Junctions re-visited Ben Supnik251March 12, 2013 11:55AM
Re: T-Junctions re-visited Roland Melkert243March 13, 2013 10:08AM
Re: T-Junctions re-visited Travis Cobbs269March 13, 2013 11:27AM
Re: T-Junctions re-visited Allen Smith290March 12, 2013 02:01PM
Re: T-Junctions re-visited Michael Heidemann256March 13, 2013 09:27AM
Re: T-Junctions re-visited Ben Supnik254March 13, 2013 10:37AM
Re: T-Junctions re-visited Tim Gould239March 13, 2013 02:31PM
Re: T-Junctions re-visited Michael Heidemann237March 13, 2013 03:42PM
Re: T-Junctions re-visited Michael Heidemann232March 17, 2013 04:35AM
Re: T-Junctions re-visited Ben Supnik213March 17, 2013 08:43AM
Re: T-Junctions re-visited Michael Heidemann218March 17, 2013 08:59AM
Re: T-Junctions re-visited Ben Supnik220March 17, 2013 09:02AM
Re: T-Junctions re-visited Magnus Forsberg218March 17, 2013 09:15AM
Re: T-Junctions re-visited Travis Cobbs269March 17, 2013 10:09PM
Re: T-Junctions re-visited Ben Supnik243March 18, 2013 07:30AM
Re: T-Junctions re-visited Travis Cobbs252March 18, 2013 10:57AM
Re: T-Junctions re-visited Ben Supnik256March 18, 2013 11:27AM
Re: T-Junctions re-visited Travis Cobbs246March 18, 2013 12:23PM
Re: T-Junctions re-visited Ben Supnik258March 18, 2013 01:41PM
Re: T-Junctions re-visited Roland Melkert268March 18, 2013 02:51PM
Re: T-Junctions re-visited Travis Cobbs244March 18, 2013 02:59PM
Re: T-Junctions re-visited Roland Melkert264March 18, 2013 03:41PM
Re: T-Junctions re-visited Ben Supnik253March 18, 2013 06:09PM
Re: T-Junctions re-visited Roland Melkert254March 19, 2013 11:38AM
Re: T-Junctions re-visited Ben Supnik274March 19, 2013 11:43AM
Re: T-Junctions re-visited Roland Melkert293March 19, 2013 07:07PM
Re: T-Junctions re-visited Travis Cobbs262March 19, 2013 10:13PM
Re: T-Junctions re-visited Tim Gould251March 20, 2013 03:56AM
Re: T-Junctions re-visited Travis Cobbs238March 20, 2013 10:13AM
Re: T-Junctions re-visited Ben Supnik230March 20, 2013 10:23AM
Re: T-Junctions re-visited Travis Cobbs243March 20, 2013 10:29AM
Re: T-Junctions re-visited Travis Cobbs242March 20, 2013 10:26AM
Re: T-Junctions re-visited Ben Supnik219March 20, 2013 11:18AM
Re: T-Junctions re-visited Ben Supnik240March 20, 2013 06:42AM
Re: T-Junctions re-visited Roland Melkert236March 20, 2013 11:36AM
Re: T-Junctions re-visited Philippe Hurbain248March 20, 2013 06:36AM
Re: T-Junctions re-visited Ben Supnik243March 20, 2013 06:58AM
Re: T-Junctions re-visited Allen Smith252March 20, 2013 09:08AM
Re: T-Junctions re-visited Roland Melkert262March 20, 2013 11:35AM
Re: T-Junctions re-visited Ben Supnik637March 20, 2013 11:50AM
Re: T-Junctions re-visited Michael Heidemann262March 18, 2013 03:54PM
Re: T-Junctions re-visited Roland Melkert239March 13, 2013 10:03AM
Re: T-Junctions re-visited Tim Gould219March 13, 2013 03:56PM
Re: T-Junctions re-visited Sergio Reano226March 13, 2013 03:51PM
Re: T-Junctions re-visited Roland Melkert289March 13, 2013 04:36PM
Re: T-Junctions re-visited Tim Gould252March 13, 2013 05:10PM
Re: T-Junctions re-visited Ben Supnik231March 14, 2013 08:17PM
Re: T-Junctions re-visited Tim Gould290March 14, 2013 08:41PM
Re: T-Junctions re-visited Ben Supnik288March 15, 2013 10:56AM
Re: T-Junctions re-visited Roland Melkert240March 15, 2013 11:36AM
Re: T-Junctions re-visited Ben Supnik222March 13, 2013 06:58PM
Re: T-Junctions re-visited Roland Melkert230March 13, 2013 07:27PM
Re: T-Junctions re-visited Ben Supnik207March 13, 2013 07:37PM
Re: T-Junctions re-visited Roland Melkert226March 13, 2013 07:59PM
Re: T-Junctions re-visited Ben Supnik254March 13, 2013 08:18PM
Re: T-Junctions re-visited Travis Cobbs272March 14, 2013 03:23PM
Re: T-Junctions re-visited Roland Melkert280March 14, 2013 03:34PM
Re: T-Junctions re-visited Tim Gould297March 14, 2013 03:41PM
Re: T-Junctions re-visited Roland Melkert261March 15, 2013 11:33AM
Re: T-Junctions re-visited Tim Gould219March 13, 2013 07:43PM
Re: T-Junctions re-visited Roland Melkert226March 13, 2013 08:08PM
Re: T-Junctions re-visited Tim Gould231March 13, 2013 08:18PM
Re: T-Junctions re-visited Ben Supnik292March 14, 2013 08:15PM
Re: T-Junctions re-visited Roland Melkert281March 15, 2013 11:29AM
Re: T-Junctions re-visited Travis Cobbs253March 15, 2013 12:27PM
Re: T-Junctions re-visited Ben Supnik267March 15, 2013 05:08PM
Re: T-Junctions re-visited Travis Cobbs253March 16, 2013 11:29PM
Re: T-Junctions re-visited Ben Supnik208March 17, 2013 08:58AM
Re: T-Junctions re-visited Roland Melkert218March 17, 2013 12:35PM
Re: T-Junctions re-visited Travis Cobbs240March 18, 2013 12:28PM
Re: T-Junctions re-visited Travis Cobbs263March 18, 2013 12:32PM
Re: T-Junctions re-visited Roland Melkert258March 18, 2013 05:00PM
Re: T-Junctions re-visited Travis Cobbs286March 18, 2013 11:05PM
Re: T-Junctions re-visited Roland Melkert307March 19, 2013 11:38AM
Re: T-Junctions re-visited Sergio Reano291March 26, 2013 02:46PM
Re: T-Junctions re-visited Roland Melkert239March 27, 2013 11:19AM
Re: T-Junctions re-visited Sergio Reano292March 27, 2013 01:48PM



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