Welcome! Log In Create A New Profile

Advanced
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 Cobbs709March 11, 2013 10:38PM
Re: T-Junctions re-visited Tim Gould347March 11, 2013 11:31PM
Re: T-Junctions re-visited Roland Melkert329March 12, 2013 11:17AM
Re: T-Junctions re-visited Ben Supnik330March 12, 2013 11:17AM
Re: T-Junctions re-visited Roland Melkert317March 12, 2013 11:22AM
Re: T-Junctions re-visited Ben Supnik300March 12, 2013 11:32AM
Re: T-Junctions re-visited Roland Melkert299March 12, 2013 11:41AM
Re: T-Junctions re-visited Ben Supnik313March 12, 2013 11:55AM
Re: T-Junctions re-visited Roland Melkert311March 13, 2013 10:08AM
Re: T-Junctions re-visited Travis Cobbs334March 13, 2013 11:27AM
Re: T-Junctions re-visited Allen Smith339March 12, 2013 02:01PM
Re: T-Junctions re-visited Michael Heidemann322March 13, 2013 09:27AM
Re: T-Junctions re-visited Ben Supnik307March 13, 2013 10:37AM
Re: T-Junctions re-visited Tim Gould304March 13, 2013 02:31PM
Re: T-Junctions re-visited Michael Heidemann298March 13, 2013 03:42PM
Re: T-Junctions re-visited Michael Heidemann321March 17, 2013 04:35AM
Re: T-Junctions re-visited Ben Supnik271March 17, 2013 08:43AM
Re: T-Junctions re-visited Michael Heidemann273March 17, 2013 08:59AM
Re: T-Junctions re-visited Ben Supnik277March 17, 2013 09:02AM
Re: T-Junctions re-visited Magnus Forsberg287March 17, 2013 09:15AM
Re: T-Junctions re-visited Travis Cobbs348March 17, 2013 10:09PM
Re: T-Junctions re-visited Ben Supnik308March 18, 2013 07:30AM
Re: T-Junctions re-visited Travis Cobbs308March 18, 2013 10:57AM
Re: T-Junctions re-visited Ben Supnik317March 18, 2013 11:27AM
Re: T-Junctions re-visited Travis Cobbs303March 18, 2013 12:23PM
Re: T-Junctions re-visited Ben Supnik324March 18, 2013 01:41PM
Re: T-Junctions re-visited Roland Melkert338March 18, 2013 02:51PM
Re: T-Junctions re-visited Travis Cobbs309March 18, 2013 02:59PM
Re: T-Junctions re-visited Roland Melkert376March 18, 2013 03:41PM
Re: T-Junctions re-visited Ben Supnik345March 18, 2013 06:09PM
Re: T-Junctions re-visited Roland Melkert320March 19, 2013 11:38AM
Re: T-Junctions re-visited Ben Supnik338March 19, 2013 11:43AM
Re: T-Junctions re-visited Roland Melkert354March 19, 2013 07:07PM
Re: T-Junctions re-visited Travis Cobbs326March 19, 2013 10:13PM
Re: T-Junctions re-visited Tim Gould320March 20, 2013 03:56AM
Re: T-Junctions re-visited Travis Cobbs307March 20, 2013 10:13AM
Re: T-Junctions re-visited Ben Supnik295March 20, 2013 10:23AM
Re: T-Junctions re-visited Travis Cobbs317March 20, 2013 10:29AM
Re: T-Junctions re-visited Travis Cobbs309March 20, 2013 10:26AM
Re: T-Junctions re-visited Ben Supnik289March 20, 2013 11:18AM
Re: T-Junctions re-visited Ben Supnik311March 20, 2013 06:42AM
Re: T-Junctions re-visited Roland Melkert288March 20, 2013 11:36AM
Re: T-Junctions re-visited Philippe Hurbain307March 20, 2013 06:36AM
Re: T-Junctions re-visited Ben Supnik350March 20, 2013 06:58AM
Re: T-Junctions re-visited Allen Smith333March 20, 2013 09:08AM
Re: T-Junctions re-visited Roland Melkert335March 20, 2013 11:35AM
Re: T-Junctions re-visited Ben Supnik743March 20, 2013 11:50AM
Re: T-Junctions re-visited Michael Heidemann342March 18, 2013 03:54PM
Re: T-Junctions re-visited Roland Melkert303March 13, 2013 10:03AM
Re: T-Junctions re-visited Tim Gould275March 13, 2013 03:56PM
Re: T-Junctions re-visited Sergio Reano281March 13, 2013 03:51PM
Re: T-Junctions re-visited Roland Melkert350March 13, 2013 04:36PM
Re: T-Junctions re-visited Tim Gould308March 13, 2013 05:10PM
Re: T-Junctions re-visited Ben Supnik310March 14, 2013 08:17PM
Re: T-Junctions re-visited Tim Gould354March 14, 2013 08:41PM
Re: T-Junctions re-visited Ben Supnik354March 15, 2013 10:56AM
Re: T-Junctions re-visited Roland Melkert299March 15, 2013 11:36AM
Re: T-Junctions re-visited Ben Supnik268March 13, 2013 06:58PM
Re: T-Junctions re-visited Roland Melkert282March 13, 2013 07:27PM
Re: T-Junctions re-visited Ben Supnik264March 13, 2013 07:37PM
Re: T-Junctions re-visited Roland Melkert288March 13, 2013 07:59PM
Re: T-Junctions re-visited Ben Supnik309March 13, 2013 08:18PM
Re: T-Junctions re-visited Travis Cobbs342March 14, 2013 03:23PM
Re: T-Junctions re-visited Roland Melkert355March 14, 2013 03:34PM
Re: T-Junctions re-visited Tim Gould358March 14, 2013 03:41PM
Re: T-Junctions re-visited Roland Melkert338March 15, 2013 11:33AM
Re: T-Junctions re-visited Tim Gould294March 13, 2013 07:43PM
Re: T-Junctions re-visited Roland Melkert286March 13, 2013 08:08PM
Re: T-Junctions re-visited Tim Gould292March 13, 2013 08:18PM
Re: T-Junctions re-visited Ben Supnik360March 14, 2013 08:15PM
Re: T-Junctions re-visited Roland Melkert351March 15, 2013 11:29AM
Re: T-Junctions re-visited Travis Cobbs334March 15, 2013 12:27PM
Re: T-Junctions re-visited Ben Supnik333March 15, 2013 05:08PM
Re: T-Junctions re-visited Travis Cobbs338March 16, 2013 11:29PM
Re: T-Junctions re-visited Ben Supnik266March 17, 2013 08:58AM
Re: T-Junctions re-visited Roland Melkert266March 17, 2013 12:35PM
Re: T-Junctions re-visited Travis Cobbs305March 18, 2013 12:28PM
Re: T-Junctions re-visited Travis Cobbs356March 18, 2013 12:32PM
Re: T-Junctions re-visited Roland Melkert318March 18, 2013 05:00PM
Re: T-Junctions re-visited Travis Cobbs349March 18, 2013 11:05PM
Re: T-Junctions re-visited Roland Melkert384March 19, 2013 11:38AM
Re: T-Junctions re-visited Sergio Reano352March 26, 2013 02:46PM
Re: T-Junctions re-visited Roland Melkert295March 27, 2013 11:19AM
Re: T-Junctions re-visited Sergio Reano364March 27, 2013 01:48PM



Sorry, only registered users may post in this forum.

Click here to login