| --- Log opened Sat Aug 11 00:00:28 2012 |
| 00:14 | < Tarinaky> | Why does learning a new build system always involve sacrificing goats to eldritch beings? |
| 00:16 | <&McMartin> | Because Dependency tracking is more problem specific than people want to admit. |
| 00:22 | < Tarinaky> | I'm not even tracking dependancies. |
| 00:22 | < Tarinaky> | I just want it to build. |
| 00:22 | <&McMartin> | If it doesn't track them it won't know which bits need to go into the product. |
| 00:23 | < Tarinaky> | Yes, but it can't find a library that is right there where I'm telling it to find it. |
| 00:24 | < Tarinaky> | Is anyone here familiar at all with CMake? |
| 00:35 | < rms> | I |
| 00:36 | < rms> | Haven't touched it in a year though |
| 00:42 | < Tarinaky> | I can't seem to get it to find the libraries being built using external project. |
| 00:42 | < Tarinaky> | The libraries themselves are building. |
| 00:42 | < Tarinaky> | And I can find them in the file system afterwards. |
| 00:43 | < Tarinaky> | But whatever I try I can't seem to get cmake to point the linker at them. |
| 00:43 | < Tarinaky> | http://pastebin.com/5qTkkuRW |
| 00:45 | < Tarinaky> | What eldritch incantation does line 39 need to be to make it work :/ |
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| 00:52 | < rms> | That's way more complicated than the stuff I did :/ |
| 00:53 | < Tarinaky> | >.< |
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| 01:49 | < Tarinaky> | Oh well, 'sod it'. |
| 01:55 | <&McMartin> | Mmm. |
| 01:56 | <&McMartin> | Only one problem left before I have solved Everything On 4clojure. |
| 01:56 | <&McMartin> | That wasn't the plan but it turns out Osmium interacts better with the site. |
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| 02:01 | <&McMartin> | (#152, Latin Square Slicing) |
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| 09:23 | < froztbyte> | http://theproofistrivial.com/ |
| 09:46 | < froztbyte> | http://patriciopalladino.com/blog/2012/08/09/non-alphanumeric-javascript.html |
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| 19:59 | < Rhamphoryncus> | arch. I just realized the diagram I drew this morning to help myself get things straight is in fact wrong. |
| 19:59 | <~Vornicus> | Rham, do you have that diagram that shows how triangles cut through the grid based on the geodesation number? |
| 20:00 | < Rhamphoryncus> | the great circles thing? |
| 20:00 | <~Vornicus> | No, the one that's the grid of little triangles, and then big triangles are superimposed on it so you can find for instance the {3, 1} geodesation layout on it? |
| 20:00 | < Rhamphoryncus> | hrm |
| 20:01 | <~Vornicus> | and it talks about type I, II, and III geodesations? |
| 20:01 | < Rhamphoryncus> | http://i579.photobucket.com/albums/ss233/taffgoch/Geodesic_Tessellate_Classifica tion.png |
| 20:01 | < Rhamphoryncus> | http://stackoverflow.com/questions/3031875/math-for-a-geodesic-sphere |
| 20:01 | <~Vornicus> | That thing, yes, thank you. |
| 20:02 | <~Vornicus> | The one I was looking for was in fact Marcelo's |
| 20:02 | < Rhamphoryncus> | Marcelo was the OP, not the first answer |
| 20:03 | <~Vornicus> | ph, right, gafftoch's then |
| 20:04 | < Rhamphoryncus> | I need to do some rethinking. My code is still too complicated |
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| 20:21 | < Rhamphoryncus> | It shouldn't be a 6 step process to figure out coordinates |
| 20:22 | <~Vornicus> | when you say 6 step process, what are your 6 steps? |
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| 20:27 | < Rhamphoryncus> | calculate_hex takes an x,y,z (integer indexes into hexagons, pretending it's a flat hexagonal grid). That translates into a,b,c for the triangular grid, which through the wonder of duals lines up differently. Passes that to calculate_point 7 times (centroid plus 6 corners). It does a divmod on the a,b (ignoring the c) and use the quotient as indexes into the sectors array. It then takes the corners of the sector, splits it into |
| 20:27 | < Rhamphoryncus> | two triangles, picks the appropriate one, and does barycentric coordinates within it using the remainder of the a,b |
| 20:29 | < Rhamphoryncus> | The sector array is built by taking my old dodecahedral face positions, mapping them down to a 2-d array of points, then batching 4 neighbours into a sector. The point of the batching is when I want to chunk out of the flat hexagonal grid to make it coned again I can just duplicate across the missing sectors |
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| 20:34 | < Rhamphoryncus> | Sounds messy, eh? |
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| 20:39 | <~Vornicus> | Sounds... idunno. it does sound kind of messy, I have concerns about, um. Culling. I'm not sure what to say about it, though |
| 20:40 | < Rhamphoryncus> | yeah |
| 20:43 | < Rhamphoryncus> | stupid-complicated is what it is |
| 20:44 | < Rhamphoryncus> | but physics aren't on my side |
| 20:45 | < Rhamphoryncus> | A cube is much simpler, but the vertices are 73% further out than the face |
| 20:52 | < Rhamphoryncus> | hrm. If I treat an icosahedron like a tube, so the east-west wrap but the north-south does not, wouldn't that give saner coordinates? |
| 20:58 | < Rhamphoryncus> | Ditch the triangular coordinate step. When positioning a hexagon give its centroid and the surrounding centroids. That's enough to derive borders |
| 21:03 | < Rhamphoryncus> | and an offset grid for the coordinate system, meaning the latitude is always event (0, 2, 4, 6) while longitude alternates even/odd depending on the latitude |
| 21:03 | < Rhamphoryncus> | https://lh4.googleusercontent.com/-GmXcRDRywIk/Th5I6ljjtwI/AAAAAAAAAqI/Mh2DXku6l 7Y/offset-grid.jpg |
| 21:04 | < Rhamphoryncus> | Using those for hexagons is an old trick. Slightly deformed, but close enough to make sense of the coordinates, and I can fix it in the vertices |
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| 21:11 | < Rhamph-mobile> | gonna watch tv and mull that over. Input welcome, vorn. |
| 21:14 | < Rhamph-mobile> | Baa. No option to keep the phone awake and connected. |
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| 21:49 | < Rhamph-mobile> | huh, still connected |
| 21:49 | <~Vornicus> | Somehow, yes |
| 21:51 | < Rhamph-mobile> | different phone, less stupid. |
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| 23:24 | < Rhamph-mobile> | Thank you samsung. Got another ad on my phone, which pissed me off enough that I'm loosing sleep. |
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| --- Log closed Sun Aug 12 00:00:43 2012 |