--- Log opened Tue Jun 24 00:00:21 2025
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10:00 < kanzure> hmph
10:01 < kanzure> so parasolid is just some magic trick and doesn't actually have all the modeling capabilities
10:01 < kanzure> would constraining deisgners to actually use f-rep or CSG be so bad? or does that really eliminate too many common design capabilities that are widely used?
10:02 < kanzure> instead of having a grab-bag of modeling tricks, maybe the better solution is to expose some of the underlying topological representations and let designers determine the intersections or results more directly, instead of hoping there is an implementation? i don't know how to expose this though in a user-usable way.
10:04 < hprmbridge> norkatron> @kanzure what is your goal ?
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11:17 < hprmbridge> kanzure> better open-source CAD
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12:10 < geneh2> things that look simple may be very complicated.
12:14 < geneh2> it's hard to specify machining tolerances without B-Rep, because these are properties of topological entities
12:16 < geneh2> there is active work on how to specify GD&T with implicits, but it's weird
12:19 < geneh2> some of the issues with B-Reps might be resolved with watertight representations. https://www.osti.gov/servlets/purl/1635598
12:25 < hprmbridge> kanzure> Why not specify tolerances as an annotation
12:30 < geneh2> pictures? that's hard for software to query
12:49 < geneh2> I think some of these problems are from current B-reps cheating. They have to approximate where surfaces intersect because the math's too hard
12:51 < geneh2> so there's actually a gap where the intersection is that you hide from the user. I think this means all sorts of extra rules for managing the approximation
12:55 < geneh2> just describing a simple cylindrical hole in a flat plate is horrifying
12:56 < geneh2> see this for more https://repositories.lib.utexas.edu/items/6b18d003-9da7-429e-b01d-b3b12220f8c0
13:26 < hprmbridge> kanzure> what if we just simulate voxels and machining to remove voxels, and you can tweak the simulation to change the voxel sizing or resolution
13:26 < hprmbridge> kanzure> and then you can recompute the final shape any number of times, using different resolution or parameters
13:27 < hprmbridge> kanzure> this is better than CSG because it forces you to pick plausible machine tool shapes or manufacturing techniques maybe
13:32 < L29Ah> juri__ works on a csg voxel-cad :>
14:54 < hprmbridge> norkatron> that program exists kinda , 3d-coat https://3dcoat.com/
14:54 < hprmbridge> norkatron> does voxel csg
14:55 < hprmbridge> norkatron> afaik its the most advanced voxel modelling program
15:26 < geneh2> voxels are not a very good way to simulate machining. Lathe operations are poorly approximated.
15:26 < hprmbridge> kanzure> increase the resolution?
15:26 < hprmbridge> kanzure> you would store the tool paths not the voxels. The voxels are only for rendering I think.
15:41 < hprmbridge> kanzure> "A federal judge has ruled that Anthropic's use of books to train Claude falls under fair use, and is legal under U.S. copyright law. [But not pirated books]"
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15:44 < geneh2> sounds like B-rep with extra steps. High performance cams are strongly sensitive to discretization error.
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15:50 < geneh2> because higher order derivative of position matter to cams.
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20:58 < hprmbridge> kanzure> "Flow-Lenia: Emergent evolutionary dynamics in mass conservative continuous cellular automata" https://www.arxiv.org/abs/2506.08569
20:58 < hprmbridge> kanzure> https://x.com/eplantec/status/1937569852698308806
20:59 < hprmbridge> kanzure> "system to simulate multi-species environments where rules can compete for mass"
--- Log closed Wed Jun 25 00:00:22 2025