UmbralRaptor changed the topic of #kspacademia to: https://gist.github.com/pdn4kd/164b9b85435d87afbec0c3a7e69d3e6d | Dogs are cats. Spiders are cat interferometers. | Космизм сегодня! | Document well, for tomorrow you may get mauled by a ネコバス. | <UmbralRaptor> … one of the other grad students just compared me to nomal O_o | <ferram4> I shall beat my problems to death with an engineer.
Kosmo|EVA is now known as TheKosmonaut
GreeningGalaxy is now known as Ellied
<UmbralRaptor> Astronomy units: we take the base 10 log of the "surface" gravity of a star (in cgs units)
<Iskierka> ... can we throw the people who decided this into the sun?
<UmbralRaptor> I think many of them are long since retired, if not dead.
<Ellied> why doesn't esper support cloaking anyway
<Iskierka> can we do it anyway?
* Iskierka is unaware of what specifically cloaking is
<Ellied> when the server hides your ip and gives you a hashed hostmask instead of your actual address
<Ellied> charybdis has support for it, but esper disables it for some reason
<Iskierka> probably easier to ban spammers?
<Ellied> you can still ban people by cloaked hosts because they're (theoretically) unique and consistent
<Iskierka> you get ranges you might want to temp ban though, and then there's webchats and allah is doing
<Ellied> must be
<Ellied> giant terrifying kitty!
<Ellied> housecats are scary enough tbh, and they're tiny beasts that are easy to overpower
<Iskierka> https://i.imgur.com/tquq1Is.mp4 kitties are weird
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<whitequark> !wpn egg
* Qboid gives egg a mathematician
<whitequark> GIMME
<whitequark> NEED ONE
<egg> whitequark: mmm?
<whitequark> a mathematician
<egg> whitequark: yes, but why do you need one
<whitequark> solvespace!
<egg> whitequark: I thought you already had one?
<whitequark> there can never be enough mathematicians.
<egg> true enough :D
<egg> whitequark: any specific questions?
<whitequark> NURBS lofting
<whitequark> :p
* egg doesn't know what lofting means in this context, assumes that it's not the same as lofted trajectories for rocket launches
<whitequark> no
<whitequark> dragging a closed contour along a curve
<whitequark> and creating a shell that way
<whitequark> so lofting a circle along a line gives you a cylinder
* egg stabs CAD in the terrible terminology
<whitequark> what
<whitequark> what's wrong with it
<whitequark> it's not even CAD, I think it came from shipbuilding
<egg> well the terminology isn't at all trying to refer to what's happening geometrically :-p
<whitequark> okay
<egg> though arguably that's still a much saner word than slerp
<whitequark> what *is* even happening geometrically
<egg> I'm not entirely sure; do you rotate the closed contour as you drag it along the curve?
<whitequark> generally no
<whitequark> I imagine that would involve some nightmare-mode math
<egg> ok, so it's some sort of parallel transport in Euclidean space I guess
<whitequark> that does not sound wrong
<egg> whitequark: well it's not necessarily nightmare-mode: a revolution surface is just that: rotating a thing as you drag it along a circle
<whitequark> yes but now you have to represent it in NURBS
<egg> ah apparently it's surface of revolution, not revolution surface
<egg> whitequark: I don't really have any good intuition of how NURBS behave and whether they have any nice properties tbh, so no idea
<egg> whitequark: also as far as terminology goes, that feels like a product of two 1d spaces, which you then immerse in 3d space in a rather boring way
<kmath> <mnxmnkmnd> @whitequark Dude's ready to star in 2017's new hit JRPG
<whitequark> egg: the problem isn't basic math, the problem is how to specifcally do this using trimmed NURBS surface representation
<egg> yeah, I get that
<egg> but there I'm really not familiar with how those things behave
<egg> hmm, nurbs surfaces live in some tensor product space over the curves? what do the pure tensors look like
<whitequark> this is the first time I hear nurbs and tensor in one sentence
<egg> whitequark: bearing I mind that I have no idea what I'm saying (I'd say I have no idea what I'm doing, but I'm hardly doing anything besides confusing you), I'm going by "general form of a NURBS surface" here https://en.wikipedia.org/wiki/Non-uniform_rational_B-spline#Technical_specifications
<egg> and then random googling leads me to more of that form and talking about tensors https://www.tsplines.com/technology/edu/TensorProduct.pdf
<egg> so the "natural" question that comes to my deranged mind is whether it makes sense to look at the pure tensors
<egg> since the thing you're looking for sounds productish, maybe it's a tensor product?
<egg> who knows
<egg> I'm not sure where the points come from in that tensory talk though, so that's greatly confusing
<egg> whitequark: so, if we see the curves as just arbitrary parametric things, this is just the sum of them (and possibly some offset to put one in the right place with respect to the other)?
<whitequark> uhm
<whitequark> what is
<egg> whitequark: lofting; allow me to illustrate: http://i.imgur.com/JGuBvX4.png
<whitequark> oh, you've just invented brep
<whitequark> more or less
<whitequark> brep is super easy to write a CAD in, rrrright until the point where you need to interoperate with anything or make a triangle mesh, at which point you're fucked
<egg> whitequark: ah, lofting *does* include rotation?
<whitequark> oh?
<whitequark> oh, I misunderstood what you meant by "rotation"
<egg> parallel transport along the curve, rather than parallel transport along Euclidean space
<whitequark> yes, the normal of the closed contour always points tangential to the curve
<egg> whitequark: the closed contour is flat?
<whitequark> yes
<egg> also "brep" >_>
* egg stabs silly words
<whitequark> boundary representation
<egg> yes, I saw
<whitequark> any chance you have a picture of a large group of rodents in grass
<whitequark> preferably groundhogs or gophers but I'll take any kind of rodent in any kind of grass
<egg> O_o sadly I don't have any pictures of groups of rodents; I have a picture of a single terrified sorex araneus
<egg> it is in grass though
<whitequark> wow, shrews are tiny
* egg tames a shrew
<egg> oh wow Google Photos did manage to find it when I queried my photos for shrew
<whitequark> "This means that a shrew may starve if it finds no food for as little as 5 hours." wow
<egg> ML actually being useful for once
<egg> whitequark: also the reason why it is terrified: https://goo.gl/photos/REJ6aGB9VD2ejjxC9
<egg> (note the timestamps, apparently ANBOcat got bored with it and let it go)
<whitequark> did it like, freeze in sight of a cat?
<kmath> <f1ac5> I'm on a train https://t.co/SQjmfxx3zC
<whitequark> its so tiny
<egg> whitequark: um, so, on lofting, I don't think I fully understand the rotation applied: we keep the plane of one curve normal to the other curve, but that leaves us one degree of freedom ("twisting" along the other curve). You could say "don't twist", but how do you define that
<egg> do we follow the Frenet frame?
<egg> whitequark: is the third item on each row here a lofting? http://i.imgur.com/F3VDTVm.png
<egg> !wpn
* Qboid gives egg a graviton classmethod/gazebo hybrid
<egg> !wpn whitequark
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<egg> !wpn Iskierka
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<kmath> <whitequark> @eevee I would like to see a photo of my face when I learned that this is actually how you're supposed to run latex
<egg> hmm, also I think eevee's figure style is similar to mine, figures in the margins? I think I managed to get something working for my applications
<egg> or does she not want it in the margins
* egg is confused
<Iskierka> surely that part should be backing up all the latex pdfs, recompiling, comparing checksum, and repeating until checksum matches
<egg> !wpn Iskierka
* Qboid gives Iskierka a principal Orcrist
<Qboid> [#1334] title: A bunch of cleanups in the interface | * Factor out the code that converts `XYZ` and `QP` to and from typed entities.... | https://github.com/mockingbirdnest/Principia/issues/1334
<egg> !wpn UmbralRaptor
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<soundnfury> !wpn egg
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<Thomas> !wpn egg
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<egg> !wpn Thomas
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<soundnfury> !wpn egg
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<UmbralRaptor> !wpn egg
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<UmbralRaptor> !wpn ferram4
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<ferram4> o/
<soundnfury> \o
<soundnfury> !wpn UmbralRaptor
* Qboid gives UmbralRaptor a prompt-critical lance
<UmbralRaptor> It's actually a fuel rod.
<Ellied> Plutonium and dU are both pyrophoric. I bet you could make a really intense thermal lance with that.
<Ellied> er, regular uranium is presumably also
<Ellied> !u ¨
<Qboid> U+00A8 DIAERESIS (¨)
<soundnfury> !wpn -add:adj plaid
<Qboid> soundnfury: Adjective added!
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