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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 Cobbs920March 11, 2013 10:38PM
Re: T-Junctions re-visited Tim Gould484March 11, 2013 11:31PM
Re: T-Junctions re-visited Roland Melkert423March 12, 2013 11:17AM
Re: T-Junctions re-visited Ben Supnik438March 12, 2013 11:17AM
Re: T-Junctions re-visited Roland Melkert411March 12, 2013 11:22AM
Re: T-Junctions re-visited Ben Supnik394March 12, 2013 11:32AM
Re: T-Junctions re-visited Roland Melkert386March 12, 2013 11:41AM
Re: T-Junctions re-visited Ben Supnik397March 12, 2013 11:55AM
Re: T-Junctions re-visited Roland Melkert393March 13, 2013 10:08AM
Re: T-Junctions re-visited Travis Cobbs416March 13, 2013 11:27AM
Re: T-Junctions re-visited Allen Smith427March 12, 2013 02:01PM
Re: T-Junctions re-visited Michael Heidemann411March 13, 2013 09:27AM
Re: T-Junctions re-visited Ben Supnik388March 13, 2013 10:37AM
Re: T-Junctions re-visited Tim Gould397March 13, 2013 02:31PM
Re: T-Junctions re-visited Michael Heidemann382March 13, 2013 03:42PM
Re: T-Junctions re-visited Michael Heidemann409March 17, 2013 04:35AM
Re: T-Junctions re-visited Ben Supnik354March 17, 2013 08:43AM
Re: T-Junctions re-visited Michael Heidemann353March 17, 2013 08:59AM
Re: T-Junctions re-visited Ben Supnik343March 17, 2013 09:02AM
Re: T-Junctions re-visited Magnus Forsberg362March 17, 2013 09:15AM
Re: T-Junctions re-visited Travis Cobbs430March 17, 2013 10:09PM
Re: T-Junctions re-visited Ben Supnik399March 18, 2013 07:30AM
Re: T-Junctions re-visited Travis Cobbs394March 18, 2013 10:57AM
Re: T-Junctions re-visited Ben Supnik402March 18, 2013 11:27AM
Re: T-Junctions re-visited Travis Cobbs374March 18, 2013 12:23PM
Re: T-Junctions re-visited Ben Supnik448March 18, 2013 01:41PM
Re: T-Junctions re-visited Roland Melkert457March 18, 2013 02:51PM
Re: T-Junctions re-visited Travis Cobbs435March 18, 2013 02:59PM
Re: T-Junctions re-visited Roland Melkert497March 18, 2013 03:41PM
Re: T-Junctions re-visited Ben Supnik488March 18, 2013 06:09PM
Re: T-Junctions re-visited Roland Melkert427March 19, 2013 11:38AM
Re: T-Junctions re-visited Ben Supnik442March 19, 2013 11:43AM
Re: T-Junctions re-visited Roland Melkert466March 19, 2013 07:07PM
Re: T-Junctions re-visited Travis Cobbs441March 19, 2013 10:13PM
Re: T-Junctions re-visited Tim Gould446March 20, 2013 03:56AM
Re: T-Junctions re-visited Travis Cobbs407March 20, 2013 10:13AM
Re: T-Junctions re-visited Ben Supnik403March 20, 2013 10:23AM
Re: T-Junctions re-visited Travis Cobbs434March 20, 2013 10:29AM
Re: T-Junctions re-visited Travis Cobbs410March 20, 2013 10:26AM
Re: T-Junctions re-visited Ben Supnik388March 20, 2013 11:18AM
Re: T-Junctions re-visited Ben Supnik409March 20, 2013 06:42AM
Re: T-Junctions re-visited Roland Melkert386March 20, 2013 11:36AM
Re: T-Junctions re-visited Philippe Hurbain407March 20, 2013 06:36AM
Re: T-Junctions re-visited Ben Supnik449March 20, 2013 06:58AM
Re: T-Junctions re-visited Allen Smith456March 20, 2013 09:08AM
Re: T-Junctions re-visited Roland Melkert522March 20, 2013 11:35AM
Re: T-Junctions re-visited Ben Supnik933March 20, 2013 11:50AM
Re: T-Junctions re-visited Michael Heidemann471March 18, 2013 03:54PM
Re: T-Junctions re-visited Roland Melkert395March 13, 2013 10:03AM
Re: T-Junctions re-visited Tim Gould361March 13, 2013 03:56PM
Re: T-Junctions re-visited Sergio Reano349March 13, 2013 03:51PM
Re: T-Junctions re-visited Roland Melkert435March 13, 2013 04:36PM
Re: T-Junctions re-visited Tim Gould383March 13, 2013 05:10PM
Re: T-Junctions re-visited Ben Supnik431March 14, 2013 08:17PM
Re: T-Junctions re-visited Tim Gould483March 14, 2013 08:41PM
Re: T-Junctions re-visited Ben Supnik448March 15, 2013 10:56AM
Re: T-Junctions re-visited Roland Melkert396March 15, 2013 11:36AM
Re: T-Junctions re-visited Ben Supnik348March 13, 2013 06:58PM
Re: T-Junctions re-visited Roland Melkert365March 13, 2013 07:27PM
Re: T-Junctions re-visited Ben Supnik349March 13, 2013 07:37PM
Re: T-Junctions re-visited Roland Melkert406March 13, 2013 07:59PM
Re: T-Junctions re-visited Ben Supnik408March 13, 2013 08:18PM
Re: T-Junctions re-visited Travis Cobbs471March 14, 2013 03:23PM
Re: T-Junctions re-visited Roland Melkert485March 14, 2013 03:34PM
Re: T-Junctions re-visited Tim Gould473March 14, 2013 03:41PM
Re: T-Junctions re-visited Roland Melkert444March 15, 2013 11:33AM
Re: T-Junctions re-visited Tim Gould382March 13, 2013 07:43PM
Re: T-Junctions re-visited Roland Melkert382March 13, 2013 08:08PM
Re: T-Junctions re-visited Tim Gould405March 13, 2013 08:18PM
Re: T-Junctions re-visited Ben Supnik476March 14, 2013 08:15PM
Re: T-Junctions re-visited Roland Melkert446March 15, 2013 11:29AM
Re: T-Junctions re-visited Travis Cobbs425March 15, 2013 12:27PM
Re: T-Junctions re-visited Ben Supnik413March 15, 2013 05:08PM
Re: T-Junctions re-visited Travis Cobbs435March 16, 2013 11:29PM
Re: T-Junctions re-visited Ben Supnik351March 17, 2013 08:58AM
Re: T-Junctions re-visited Roland Melkert339March 17, 2013 12:35PM
Re: T-Junctions re-visited Travis Cobbs379March 18, 2013 12:28PM
Re: T-Junctions re-visited Travis Cobbs478March 18, 2013 12:32PM
Re: T-Junctions re-visited Roland Melkert433March 18, 2013 05:00PM
Re: T-Junctions re-visited Travis Cobbs457March 18, 2013 11:05PM
Re: T-Junctions re-visited Roland Melkert519March 19, 2013 11:38AM
Re: T-Junctions re-visited Sergio Reano464March 26, 2013 02:46PM
Re: T-Junctions re-visited Roland Melkert383March 27, 2013 11:19AM
Re: T-Junctions re-visited Sergio Reano490March 27, 2013 01:48PM



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