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| 01:38.10 | RodGallowGlass | winsock.h, unistd.h, shouldn't that be one or the other? ahh never mind I keep forgetting I'm on a Cygwin system here :) |
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| 03:07.17 | CIA-4 | BRL-CAD: 03brlcad * 10brlcad/src/other/openNURBS/opennurbs_point.cpp: use common.h so it can work on non-configure platforms too |
| 03:08.38 | CIA-4 | BRL-CAD: 03brlcad * 10brlcad/src/other/openNURBS/opennurbs_system.h: don't need SUNOS now that he found the right one |
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| 05:07.59 | brlcad | howdy cad13 |
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| 09:50.38 | yukonbob | can anybody explain the way to use the dsp primitive, and any 'gotchas' associated with it (ie: is it considered experimental (and why), does it incur a large performance penalty?, etc.) |
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| 15:02.40 | thing0 | hey all |
| 15:02.44 | thing0 | hey brlcad |
| 15:08.51 | brlcad | howdy |
| 15:09.33 | thing0 | I replied to your test email |
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| 15:20.58 | thing0 | alright |
| 15:21.01 | thing0 | me sleep time |
| 15:21.08 | thing0 | have real work tomorrow |
| 15:21.09 | thing0 | hehe |
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| 18:01.52 | ``Erik | I WANT MY DMAN TOY CAR@!#~! |
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| 20:18.31 | CIA-4 | BRL-CAD: 03jlowenz * 10brlcad/src/conv/iges/Makefile.am: Remove the standalone pullback curve impl from compilation (need to delete files later) |
| 20:20.40 | CIA-4 | BRL-CAD: 03jlowenz * 10brlcad/ (6 files in 3 dirs): Debug IGES parsing/handling and openNURBS extensions. Still not building a simple B-Rep correctly (trim vertices not agreeing) |
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| 21:27.50 | yukonbob | I'll put this out one more time :) |
| 21:27.57 | yukonbob | can anybody explain the way to use the dsp primitive, and any 'gotchas' associated with it (ie: is it considered experimental (and why), does it incur a large performance penalty?, etc.) |
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| 21:32.00 | brlcad | yukonbob: hm, i missed that question originally apparently |
| 21:32.06 | brlcad | and yes, I can explain how to use it |
| 21:32.39 | brlcad | there aren't any gotchas that come to mind immediately, but there probably are some that I just implicitly don't think about any more -- it's certainly not experimental |
| 21:33.48 | brlcad | it's actually a rather highly optimized terrain in-core implementation, one of the fastest you'll find particularly for ray-tracing massive datasets |
| 21:34.21 | brlcad | basically to create a dsp, you need to prepare a data file -- this data file needs to be a binary file filled with unsigned short integer values |
| 21:34.45 | brlcad | there are a variety of ways to get that, depending on what format you have to start with, but a simple image can work for example as a starting point |
| 21:34.57 | yukonbob | ah --- I was guessing what the format might be, and I've been trying arrays of text values with various seperators ;) |
| 21:37.36 | yukonbob | is Create->dsp the only way to create one, or is there an mged command-line version as well? |
| 21:39.06 | brlcad | anything you can do in the gui had an mged command line variant .. *anything* ;) |
| 21:39.18 | yukonbob | !nice -- that's what I like to hear :) |
| 21:39.48 | brlcad | the gui really just kicks off commands, so it's all uniform |
| 21:40.09 | brlcad | there are, though, plenty of things you can do on the command line that you can't do via the gui |
| 21:46.19 | yukonbob | brlcad: when you're talking about using an image for the shortint values, what do you mean? Is there a special header required for the dsp data, or can I just use a C prog that dumps shortints to a file and use that? |
| 21:48.52 | brlcad | yukonbob: heh, if you want to write a C prog that dumps shortints, then you're golden |
| 21:49.05 | brlcad | but there may already be tools depending on what data you're starting with |
| 21:50.53 | yukonbob | brlcad: I'm not starting with any data per se, just exploring brlcad :) -- I _really_ like the precision, and the flexibility/strength of using Tcl in it, so now I'm exploring the features I haven't touched yet, and trying to figure out what I can use it for besides rapid image prototyping... |
| 21:51.16 | brlcad | e.g. if I have a brl-cad .pix file (3-channel, 24 bpp interleaved RGB raw binary image file) -- I can use pix-bw (1-channel 8 bpp raw b&w binary image file) to get monotonic values and then use 'cv' to convert to unsigned short ints |
| 21:53.12 | yukonbob | OK -- that's something I can try... |
| 21:53.40 | brlcad | here's an example that I did a few months back pretty quickly -- taking data for the puget sound: http://www.cc.gatech.edu/projects/large_models/ps.html |
| 21:54.12 | brlcad | those happen to be 16bit values already (0-65535) which is what the dsp uses |
| 21:54.33 | brlcad | create a dsp, accentuate the vertical scaling for effect, and you get http://ftp.brlcad.org/images/puget_mged.png |
| 21:55.40 | yukonbob | OK -- the first site you gave is where you grabbed the data from, then the ftp.brlcad.org[...] is your processing of that same data... |
| 21:55.48 | brlcad | right |
| 21:57.20 | brlcad | when you create a dsp, you have two options -- you can keep the data in an external file, or stash the data into the .g file |
| 21:57.20 | brlcad | use the "in" command to create one |
| 22:02.30 | yukonbob | excellent -- now, before I take too much more of your time (and you may not have a quick answer for this) -- what can I do with brlcad besides generate images to screen -- I see when I render that I can get clues about collisions in 3d space where object "illegally" intersect, and I can spin/flip/cut-away objects, etc., but what about what I've read about ballistic analysis, and radiation, etc... is this stuff done w/ data that brlcad knows a |
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| 22:12.12 | brlcad | yukonbob: your question was cut-off at "that brlcad knows a" |
| 22:12.30 | yukonbob | that brlcad knows about, and does it ship with these tools? Is there a site that scratches the surface of features like this? (I'm opening up a _huge_ subject area I realize, and just need a pointer to a site, or we can talk about this over time at some later date ;) |
| 22:12.42 | brlcad | there are a variety of geometric analyses that you can run as well as other visualizations |
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| 22:14.46 | brlcad | yukonbob: brl-cad tries to strictly limit itself to solid modeling, geometric representation, geometric analysis (answering questions about the physical properties of something modeled) -- the other analyses that we integrate with are predominantly external codes with massive efforts of their own into various methodologies |
| 22:15.21 | brlcad | e.g. the various equations for ballistics penetration are not something you'll likely find in brl-cad or on any website for that matter.. |
| 22:17.26 | RodGallowGlass | brlcad: that command line entry in the gui is quite nice, having the gui up and issuing rot 10 10 10 is nifty,got it to work in that mingw build I sent you too. |
| 22:18.02 | yukonbob | OK -- I'm not actually interested in ballistics or radiation, but was curious about what else can be done w/ brlcad and it's data -- there are references to radiation, ballistics, etc on various sites, so that's why I brought those up... I'll have more questions about the "answering questions about physical properties" later -- for now I'll let you get on with your day :) |
| 22:18.52 | yukonbob | brlcad: thanks very much for your time... I appreciate it :) |
| 22:19.30 | brlcad | yukonbob: brl-cad integrated into a lot of external analysis codes in particular for it's ray-tracing engine -- it's rather trivial to take a given model and ask brl-cad questions about a shotline .. where is the geometry on a given shotline, how thick is it, what material is it, what was the obliquity, etc -- that in turn can drive other decisions |
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| 22:21.57 | brlcad | what brl-cad can do analysis-wise, though, are geometry analysis questions too -- are there overlapping materials (rtcheck, g_qa), what's the weight of a given component (rtweight, g_qa), center of mass, what's the projected presented area of something (rtarea), what's the bounding box size, etc |
| 22:22.30 | brlcad | on the ray-tracing side, it has tools for simulating optical energy, multispectral (thermal, xray, infrared) energy, performing edge detection (rtedge) for hidden line renderings, and a bit more |
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| 22:29.35 | yukonbob | brlcad: I'm pretty excited by BRL-CAD -- seems like there's lots of space for exploration... I'm glad it's got a tcl interface for scripting too, which opens up possibilities... thx again for your insight, and talk soon |
| 22:31.16 | brlcad | yukonbob: no problem, i'm here most of the time or will answer the log later if i'm not ;) |
| 22:31.50 | brlcad | we're looking for new devs too so you're more than welcome to jump in -- anything I can do to help you along, feel free to let me know ;) |
| 22:33.15 | yukonbob | brlcad: thx -- I'm just working on a port of brlcad to NetBSD (via pkgsrc), and think I noticed some things that can be improved in the build process --- once I verify, I'll be sure to pass that info on, and otherwise, look forward to being part of the BRL-CAD community :) |
| 22:33.55 | brlcad | sweet |
| 22:37.56 | PrezKennedy | hey brlcad, have you ever visited http://thedailywtf.com/ ? |
| 22:43.28 | brlcad | I have now |
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