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Re: T-Junctions re-visited
March 18, 2013 01:41PM
Oh - I understand - it's an orthogonal purpose: to improve the quality of normal generation. (My "flat" statement was just meant as a cheap way to save CPU time by no-oping the smooth on a known flat piece.)

Two thoughts:
1. It may make sense to keep meta extensions that improve processing speed separate from meta extensions that improve normal quality; any time we add logic to make the normals look nicer, it may conflict with all other such extensions, so knowing every extension that can change the normal will be necessary for sanity.

2. If you simplify my scheme by not special-casing all-flat geometry, I've created basically "smooth-self" and "smooth-with-parent". It turns out that you can compute that cheaply and correctly on the fly for at least a few key primitives; when building the connected mesh, a mesh is smooth-self if it has zero edges that are 'open' (meaning connected to neither a line nor another triangle). stud.dat and all groups and rect.dat correctly parse as "sealed" - rect2.dat and rect3.dat parse as unsealed.

Parsing for complex parts like animals can give false "unsealed" results, but this doesn't matter- the key is to identify that heavily used primitives like studs are entirely self-sealed and don't need to be smoothed with their parents.

This means that not only can we create a faster t-junction fixer without meta commands, but the results of the seal test could be used to generate a candidate list of parts to get the META command should we choose to implement it.

3. we've had at least two other proposals for improving normal quality besides noting flat-but-shared normals: allowing the normal to come from a higher-level primitive (specified via a meta command) and allowing explicit normals for some polygons. This makes me think that normal quality, while important, might be orthogonal to the overall algorithmic problems (e.g. given no meta commands, can we come up with decent normals quickly).

cheers
ben
SubjectAuthorViewsPosted
T-Junctions re-visited Travis Cobbs687March 11, 2013 10:38PM
Re: T-Junctions re-visited Tim Gould333March 11, 2013 11:31PM
Re: T-Junctions re-visited Roland Melkert318March 12, 2013 11:17AM
Re: T-Junctions re-visited Ben Supnik320March 12, 2013 11:17AM
Re: T-Junctions re-visited Roland Melkert302March 12, 2013 11:22AM
Re: T-Junctions re-visited Ben Supnik295March 12, 2013 11:32AM
Re: T-Junctions re-visited Roland Melkert293March 12, 2013 11:41AM
Re: T-Junctions re-visited Ben Supnik303March 12, 2013 11:55AM
Re: T-Junctions re-visited Roland Melkert307March 13, 2013 10:08AM
Re: T-Junctions re-visited Travis Cobbs313March 13, 2013 11:27AM
Re: T-Junctions re-visited Allen Smith331March 12, 2013 02:01PM
Re: T-Junctions re-visited Michael Heidemann300March 13, 2013 09:27AM
Re: T-Junctions re-visited Ben Supnik297March 13, 2013 10:37AM
Re: T-Junctions re-visited Tim Gould294March 13, 2013 02:31PM
Re: T-Junctions re-visited Michael Heidemann289March 13, 2013 03:42PM
Re: T-Junctions re-visited Michael Heidemann300March 17, 2013 04:35AM
Re: T-Junctions re-visited Ben Supnik261March 17, 2013 08:43AM
Re: T-Junctions re-visited Michael Heidemann263March 17, 2013 08:59AM
Re: T-Junctions re-visited Ben Supnik265March 17, 2013 09:02AM
Re: T-Junctions re-visited Magnus Forsberg262March 17, 2013 09:15AM
Re: T-Junctions re-visited Travis Cobbs342March 17, 2013 10:09PM
Re: T-Junctions re-visited Ben Supnik297March 18, 2013 07:30AM
Re: T-Junctions re-visited Travis Cobbs298March 18, 2013 10:57AM
Re: T-Junctions re-visited Ben Supnik310March 18, 2013 11:27AM
Re: T-Junctions re-visited Travis Cobbs298March 18, 2013 12:23PM
Re: T-Junctions re-visited Ben Supnik314March 18, 2013 01:41PM
Re: T-Junctions re-visited Roland Melkert323March 18, 2013 02:51PM
Re: T-Junctions re-visited Travis Cobbs296March 18, 2013 02:59PM
Re: T-Junctions re-visited Roland Melkert345March 18, 2013 03:41PM
Re: T-Junctions re-visited Ben Supnik329March 18, 2013 06:09PM
Re: T-Junctions re-visited Roland Melkert311March 19, 2013 11:38AM
Re: T-Junctions re-visited Ben Supnik330March 19, 2013 11:43AM
Re: T-Junctions re-visited Roland Melkert348March 19, 2013 07:07PM
Re: T-Junctions re-visited Travis Cobbs318March 19, 2013 10:13PM
Re: T-Junctions re-visited Tim Gould305March 20, 2013 03:56AM
Re: T-Junctions re-visited Travis Cobbs296March 20, 2013 10:13AM
Re: T-Junctions re-visited Ben Supnik287March 20, 2013 10:23AM
Re: T-Junctions re-visited Travis Cobbs296March 20, 2013 10:29AM
Re: T-Junctions re-visited Travis Cobbs302March 20, 2013 10:26AM
Re: T-Junctions re-visited Ben Supnik280March 20, 2013 11:18AM
Re: T-Junctions re-visited Ben Supnik293March 20, 2013 06:42AM
Re: T-Junctions re-visited Roland Melkert280March 20, 2013 11:36AM
Re: T-Junctions re-visited Philippe Hurbain290March 20, 2013 06:36AM
Re: T-Junctions re-visited Ben Supnik331March 20, 2013 06:58AM
Re: T-Junctions re-visited Allen Smith317March 20, 2013 09:08AM
Re: T-Junctions re-visited Roland Melkert319March 20, 2013 11:35AM
Re: T-Junctions re-visited Ben Supnik727March 20, 2013 11:50AM
Re: T-Junctions re-visited Michael Heidemann325March 18, 2013 03:54PM
Re: T-Junctions re-visited Roland Melkert293March 13, 2013 10:03AM
Re: T-Junctions re-visited Tim Gould265March 13, 2013 03:56PM
Re: T-Junctions re-visited Sergio Reano272March 13, 2013 03:51PM
Re: T-Junctions re-visited Roland Melkert340March 13, 2013 04:36PM
Re: T-Junctions re-visited Tim Gould301March 13, 2013 05:10PM
Re: T-Junctions re-visited Ben Supnik295March 14, 2013 08:17PM
Re: T-Junctions re-visited Tim Gould347March 14, 2013 08:41PM
Re: T-Junctions re-visited Ben Supnik345March 15, 2013 10:56AM
Re: T-Junctions re-visited Roland Melkert292March 15, 2013 11:36AM
Re: T-Junctions re-visited Ben Supnik259March 13, 2013 06:58PM
Re: T-Junctions re-visited Roland Melkert274March 13, 2013 07:27PM
Re: T-Junctions re-visited Ben Supnik258March 13, 2013 07:37PM
Re: T-Junctions re-visited Roland Melkert280March 13, 2013 07:59PM
Re: T-Junctions re-visited Ben Supnik303March 13, 2013 08:18PM
Re: T-Junctions re-visited Travis Cobbs329March 14, 2013 03:23PM
Re: T-Junctions re-visited Roland Melkert344March 14, 2013 03:34PM
Re: T-Junctions re-visited Tim Gould351March 14, 2013 03:41PM
Re: T-Junctions re-visited Roland Melkert327March 15, 2013 11:33AM
Re: T-Junctions re-visited Tim Gould283March 13, 2013 07:43PM
Re: T-Junctions re-visited Roland Melkert277March 13, 2013 08:08PM
Re: T-Junctions re-visited Tim Gould277March 13, 2013 08:18PM
Re: T-Junctions re-visited Ben Supnik347March 14, 2013 08:15PM
Re: T-Junctions re-visited Roland Melkert338March 15, 2013 11:29AM
Re: T-Junctions re-visited Travis Cobbs313March 15, 2013 12:27PM
Re: T-Junctions re-visited Ben Supnik324March 15, 2013 05:08PM
Re: T-Junctions re-visited Travis Cobbs318March 16, 2013 11:29PM
Re: T-Junctions re-visited Ben Supnik257March 17, 2013 08:58AM
Re: T-Junctions re-visited Roland Melkert261March 17, 2013 12:35PM
Re: T-Junctions re-visited Travis Cobbs299March 18, 2013 12:28PM
Re: T-Junctions re-visited Travis Cobbs337March 18, 2013 12:32PM
Re: T-Junctions re-visited Roland Melkert310March 18, 2013 05:00PM
Re: T-Junctions re-visited Travis Cobbs335March 18, 2013 11:05PM
Re: T-Junctions re-visited Roland Melkert371March 19, 2013 11:38AM
Re: T-Junctions re-visited Sergio Reano343March 26, 2013 02:46PM
Re: T-Junctions re-visited Roland Melkert288March 27, 2013 11:19AM
Re: T-Junctions re-visited Sergio Reano351March 27, 2013 01:48PM



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