| 01:33.00 | *** join/#brlcad pra5ad (n=prasad@pool-151-196-137-196.balt.east.verizon.net) |
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| 05:01.33 | *** topic/#brlcad is http://brlcad.org/ || BRL-CAD is an open source solid modeling software suite || Developers needed! Read the HACKING file for details on getting involved |
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| 07:48.31 | *** join/#brlcad clock_ (n=clock@zux221-122-143.adsl.green.ch) |
| 10:40.53 | *** join/#brlcad matt_ezeki_230 (n=matt@host-84-222-179-77.cust-adsl.tiscali.it) |
| 10:58.38 | matt_ezeki_230 | hi guys... i wonder if there is a way to show hidden lines of a solid model after raytrace with command rtedge -W -s1024 as broken lines |
| 11:15.49 | brlcad | matt_ezeki_230: it'd be easy enough to show the hidden lines.. though rendering to a particular style of "broken" or dashed lines would probably be tricky |
| 11:17.21 | brlcad | probably doable as a probabalistic speckled line (e.g. randomly don't draw N% of the hidden line pixels) |
| 11:17.39 | brlcad | not as nice as hard dashes, but would probably get the point across |
| 11:31.27 | matt_ezeki_230 | brlcad: ok thanks... could i ask to you which command in command window or option need i to set to show hidden raytraced lines as speckled lines? |
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| 13:38.04 | matt_ezeki_230 | i tried your method but i was still unable to show hidden lines as speckled lines. Let my explain the issue with an exemple: |
| 13:38.17 | matt_ezeki_230 | 1) in a.s rcc 0 0 -2 0 0 4 1 |
| 13:38.21 | matt_ezeki_230 | 2) in b.s rcc 0 -2 0 0 4 0 1 |
| 13:38.25 | matt_ezeki_230 | and i need to show hidden lines of the both cylinders after raytracing. |
| 13:38.34 | matt_ezeki_230 | Because file "http://ftp.brlcad.org/MGED_Quick_Reference_Trifold_Card.pdf" says "raytrace white background hidden-line image -> rtedge -W -o file.pix", i wonder if i've understood properly: |
| 13:38.50 | matt_ezeki_230 | hidden lines can be showed as speckled lines or hard dashes lines with the ONLY following command |
| 13:38.54 | matt_ezeki_230 | 3) rtedge -W -s1024 -o file.pix |
| 13:39.00 | matt_ezeki_230 | ? |
| 13:44.20 | clock_ | matt_ezeki_230: can you show hidden lines with rtedge? |
| 13:45.34 | matt_ezeki_230 | no i can't. i'm here just to know if is it possible with rtedge or other ways... |
| 13:46.48 | matt_ezeki_230 | brlcad says "it'd be easy enough to show the hidden lines...probably doable as a probabalistic speckled line (e.g. randomly don't draw N% of the hidden line pixels)..." |
| 13:47.24 | matt_ezeki_230 | but i have any idea to do his method |
| 14:08.32 | brlcad | matt_ezeki_230: I said it would be "doable" to implement/add such a feature to rtedge, not that it exists right now |
| 14:08.58 | brlcad | what you can do with it now is do a multi-pass composite |
| 14:10.19 | clock_ | brlcad: or make a multipass and make the invisible edges with a grey shade |
| 14:10.33 | clock_ | brlcad: how do you do multipass? Make another view from the other side and then mirror it? |
| 14:10.39 | brlcad | either overlaying the wireframe image (which shows the hidden lines) with an rtedge raytrace |
| 14:10.46 | brlcad | or using two rtedge passes |
| 14:12.08 | brlcad | clock_: doesn't have to be from the other side, rtedge understands a bunch of options that make it show more/fewer edges |
| 14:12.27 | clock_ | brlcad: cool |
| 14:12.37 | clock_ | --show-more-edges --show-even-more-edges :) |
| 14:12.48 | clock_ | --i-said-i-want-more-edges! |
| 14:13.02 | brlcad | for example, matt_ezeki_230, you might want to try the "detect regions" flag that will draw hidden edges on region boundaries if you've correctly created parts/assemblies (i.e. regions and groups) |
| 14:13.07 | brlcad | close :) |
| 14:13.16 | brlcad | -c"set detect_regions=1" ;) |
| 14:13.20 | clock_ | brlcad: today I am going into the surf course again :) |
| 14:16.02 | brlcad | also has -c"set overlaymode=1" for multipass rtedgings, but I suspect the best way will be to save the mged wireframe to an image and composite it over |
| 14:16.29 | brlcad | clock_: cool, where abouts? |
| 14:16.46 | clock_ | brlcad: I don't understand now what you mean |
| 14:17.11 | brlcad | where are you surfing? |
| 14:18.33 | clock_ | brlcad: on Zurich lake. But there are no waves. Only paddling training |
| 14:18.39 | clock_ | brlcad: do you swim front crawl? |
| 14:22.54 | *** join/#brlcad rossberg (n=rossberg@bz.bzflag.bz) |
| 14:35.24 | brlcad | clock_: not sure what that means |
| 14:35.30 | brlcad | hello rossberg! |
| 14:36.18 | brlcad | rossberg: you were quite a topic of discussion recently .. |
| 14:36.49 | rossberg | brlcad: really? |
| 14:37.05 | brlcad | yeah, at the annual STMG and MEVA meetings |
| 14:37.53 | brlcad | some discussion on your windows brl-cad geometry viewer |
| 14:38.11 | rossberg | ah, there was a meeting. interesting |
| 14:38.19 | brlcad | and on a bunker model |
| 14:38.32 | brlcad | yeah, every year |
| 14:38.35 | rossberg | in september there will a meeting at the iabg |
| 14:39.27 | rossberg | the bunker isn't from me (the model), but i made colculations with it |
| 14:39.45 | clock_ | brlcad: I mean you lie on the face and paddle with your hands and you swim this way. The fastest swimming style known. |
| 14:41.39 | *** mode/#brlcad [+o brlcad] by ChanServ |
| 14:42.36 | brlcad | clock_: how else would you do it?? |
| 14:44.44 | clock_ | brlcad: :) |
| 14:45.02 | clock_ | brlcad: for example breastroke |
| 14:57.15 | brlcad | with a surfboard?? :) |
| 14:57.55 | clock_ | brlcad: no just with the body, swimming |
| 15:01.23 | brlcad | ahh |
| 15:01.38 | brlcad | usually freestyle or backstroke |
| 15:22.13 | matt_ezeki_230 | brlcad: thanks for your answers. Unfortunately i'm a beginner user of brlcad and i've any idea of what a multi-pass composite is. Furthermore i've found anything about detect regions flag and -c"set detect_regions=1" command in MGED_Quick_Ref, VolumeII... and VolumeIII... docs |
| 15:24.15 | matt_ezeki_230 | Please, could you give me an example of use to create parts/assemblies correctly using "detect regions" flag? thanks in advance |
| 16:27.04 | matt_ezeki_230 | are you still here ? :-) |
| 20:14.01 | *** join/#brlcad digitalfredy (n=digitalf@200.71.62.161) |
| 23:00.20 | ``Erik | sean, ya busy? |
| 23:05.30 | brlcad | always |
| 23:08.13 | ``Erik | got a librt question if you're in the mood |
| 23:09.10 | ``Erik | got 'prep' and something in the shot func, but when I pull the trigger, shoot.c throws an oops, the ray origin is 'bad', with big honkin' numbers (like Xe40)... what'd I fuck up? |
| 23:10.03 | brlcad | you have to set up the ray in the app structure before you first |
| 23:10.07 | brlcad | s/first/fire/ |
| 23:10.21 | ``Erik | hm, I'm not doing an app, this is bin/rt |
| 23:10.33 | brlcad | look at src/rt/rtexample.c as a reference, notice how it sets: |
| 23:10.33 | brlcad | <PROTECTED> |
| 23:10.33 | brlcad | <PROTECTED> |
| 23:10.53 | brlcad | what do you mean then that you "pull the trigger"? |
| 23:11.18 | ``Erik | well, I got a .g file with a toplevel metaball called "ball" and I run /usr/brlcad/bin/rt /tmp/poo.g ball |
| 23:11.19 | brlcad | the shot routine eventually gets passed that a_ray at some point |
| 23:11.39 | brlcad | at lease the shot routine gets a ray from somewhere, and it has to be "valid" |
| 23:11.46 | ``Erik | ALL I've done to the file is "title metaballs" "units mm" "in ball metaball (lots of numbers)" |
| 23:11.54 | brlcad | ahhh |
| 23:12.21 | brlcad | shot func sounds screwed up |
| 23:12.39 | ``Erik | mine? all mine does at the moment is a bu_log ... which does NOT display |
| 23:13.18 | ``Erik | are you in tomorrow? |
| 23:13.20 | brlcad | and returns 1? |
| 23:13.27 | ``Erik | um, returns 0 I believe |
| 23:13.31 | brlcad | hmm |
| 23:13.59 | ``Erik | but since it never prints the bu_log string, I assume the return value is irrelevant |
| 23:14.14 | brlcad | ahh, it doesn't get that far? |
| 23:14.18 | ``Erik | newp |
| 23:14.51 | ``Erik | if you're in office tomorrow, I'll show you the code and output... I'm still trying to get my feet under me wrt brlcad source... :) |
| 23:15.09 | brlcad | then it's got to be prep work |
| 23:15.15 | brlcad | i'm in for half-day |
| 23:15.19 | brlcad | so good luck.. |
| 23:15.27 | ``Erik | all I do in prep is set a couple bounding spheres... |
| 23:15.38 | brlcad | yeah, have to set the bounding spheres and the bounding boxes |
| 23:15.44 | ``Erik | oh, the box as well? |
| 23:15.45 | brlcad | it "should" all be soltab stuff |
| 23:15.51 | brlcad | yeah, has to set min/max |
| 23:15.52 | ``Erik | the, um, max/min or the later one? |
| 23:16.03 | brlcad | st_min[X/Y/Z] and st_max |
| 23:16.10 | ``Erik | okie, I'll hack something into that and see if I can get my shot function to kick... |
| 23:16.26 | ``Erik | tomorrie... now it's time to cook and drink and watch tv, w00t |
| 23:16.28 | ``Erik | thanks :) |
| 23:17.38 | brlcad | should set st_center, st_aradius, st_bradius, st_specific, st_min, and st_max |
| 23:20.07 | ``Erik | ok, I only did the first three... what's st_specific? |
| 23:20.12 | ``Erik | min/max being aabb coords? |
| 23:20.59 | ``Erik | is st_specific the bu_list for 'render ready' crap? |
| 23:25.00 | brlcad | st_specific isn't probably necessary, but that'd be your in-memory prep'd data holding things like precomputed values that are useful for any ray |
| 23:25.29 | brlcad | it's basically a void * to whatever the hell you want |
| 23:25.56 | brlcad | and yeah, min/max are the aabb |
| 23:26.41 | brlcad | that's probably what it's crappingg on, it's probably some inf or inverted box or random vals, so when it translates a ray to the start or other side, it goes whack |
| 23:27.36 | ``Erik | okie |
| 23:27.54 | ``Erik | at the moment, I'm not sure I see anything that can effectively be precomputed |
| 23:28.16 | ``Erik | so I'll leave that one blank, do the aabb, see if I can't get a trivial 'walking' ray... |
| 23:28.35 | ``Erik | I may be harrassin' ya next tuesday... :) |
| 23:29.05 | ``Erik | (sorry, a few yrs ago, I woulda been all about chugging this out over the weekend, but I'm broken and embittered given my previous... assignment...) |
| 23:32.53 | brlcad | sad sad .. :) |
| 23:33.04 | brlcad | that's sweet code to poke on |
| 23:34.44 | brlcad | i think i enjoy working on primitives more than most of the rest of the codebase.. it's nice and fundamental, math intensive, and you get to see pretty stuff when it all finally works |
| 23:35.02 | brlcad | the boolean weaver is fun too, but you don't get that visual |
| 23:44.21 | ``Erik | *shrug* I showed up, wrote a build system, fixed geoffs lserver, and was slammed into muves3 |
| 23:44.32 | ``Erik | I didn't really get the opportunity to learn much about brlcad |