irclog2html for #brlcad on 20061105

02:26.52CIA-6BRL-CAD: 03johnranderson * 10brlcad/src/mged/red.c: Improved error checking
04:43.31*** join/#brlcad Noobie (n=User@pool-71-240-238-151.fred.east.verizon.net)
04:44.42Noobiecan anyone get me past the ./configure portion of the install
04:45.17Noobiei don't know if I can even get there i'm using Knoppix as my OS
04:53.13Noobiecan anyone help?
04:53.43NoobieI will try again later
04:53.48*** part/#brlcad Noobie (n=User@pool-71-240-238-151.fred.east.verizon.net)
05:27.30``Eriko.O
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08:01.45*** topic/#brlcad is http://ftp.brlcad.org (mirror of http://brlcad.org, down for 'maintenance') || BRL-CAD is an open source solid modeling software suite || Developers needed! Read the HACKING file for details on getting involved || Release 7.8.4 is posted, next release will be 7.10.0
08:35.23*** join/#brlcad ibot (i=ibot@rikers.org)
08:35.23*** topic/#brlcad is http://ftp.brlcad.org (mirror of http://brlcad.org, down for 'maintenance') || BRL-CAD is an open source solid modeling software suite || Developers needed! Read the HACKING file for details on getting involved || Release 7.8.4 is posted, next release will be 7.10.0
13:40.38MaloeranErik, this ray-triangle benchmark of yours is completely broken
13:41.12MaloeranI print out planes from the test, and I get a bunch of 0.0 equations, leading to infinities and NaNs ; obviously it's slow
14:17.50Twingyhe's ray-tracing imaginary planes, duh
14:27.06MaloeranI would fix the code but that's just one of several things that don't seem quite right in there...
14:33.47Twingyconsider yourself a code archaeologist then, fixing remnants of the past
14:34.45TwingyI'd say similar to the myth busters, but they have a habit of taking 500 year old technology and making it worse
15:41.25MaloeranHrmph. The public letter of Husseim to the united states contain way too many religious believes and statements, which is not technically a good move when dealing with followers of different... hypothesises
15:55.35Twingyhypotheses
16:27.23MaloeranThanks
16:28.12TwingyI have soooo many optimizations to do in gcam it's daunting
16:28.19TwingyI have no motivation to do it either cause just about everything is instantaneous
16:28.39MaloeranEheh, nice. It has been some time since I had wrote this kind of software
16:29.00Twingyall 2d intersection math so far
16:29.00Twingy2.5 dimensional
16:29.19Twingyafter getting this far with the project, you could transform just about any CAD package file format into a CAM ready file format if ordering is preserved
16:29.19MaloeranNeat
16:29.29Twingybut nobody seems to do that
16:29.37Twingyorder is not preserved and hence individuals have to come up with elaborate algorithms to figure out what the designer was thinking at the time of modeling because it was lost
16:29.41TwingyI wouldn't be surprised if there are some cad packages that preserve this
16:29.42Twingypreserved in a manner that was originally intended, not derived from a timestamp or something that just "happened" to be there
16:29.42Twingythe disconnect between BRL-CAD and CAM is huge
16:29.42Twingyyou'd need g-code
16:29.42Twingyeven something as 'trivial' as a box requires breaking it into layers, computing offsets, adding depth to break the part away at the end
16:29.43Twingyyou might end up with 500 lines of g-code for a box
16:29.43Twingyespecially if it's steel
16:29.43Twingyfoam might be 50 - 80 lines
16:29.43MaloeranWhy the difference between steel and foam?
16:30.23Twingysteel is slightly less hard than the end-mill (carbide usually) and therefore requires that you be very slow and conservative on your cuts otherwise you risk causing the stepper motors to skip a 'step' (1.8/20 deg) or cause and end-mill to snap
16:30.25Twingyit's always a function of the end-mill, mill cnc steppers, and material being cut
16:30.25MaloeranOkay. I wouldn't have thought going very slow would require 10 times more code
16:30.27Twingyit's a multidimensional problem
16:30.27Twingyand smaller the end mill doesn't necessarily mean you can cut faster
16:30.28Twingythere is a curve, once you hit about 1/8" you have to start slowing down
16:30.28Twingyotherwise you will snap it
16:30.28TwingyMaloeran, your layers are .001" instead of .01"
16:30.29Twingyeach layers requires 4 or more lines of g-code, depending on tapering
16:30.29MaloeranRight, okay
16:30.30Twingyso as you can imagine you have machine profiles and endmill profiles
16:30.31Twingyso that the software can figure out 'safe' operating limits
16:30.31Twingythe g-code driving software is stupid
16:30.31Twingyit doesn't care if you try to make it go 100km/h with a 2cm diameter endmill
16:30.32Twingyit doesn't even know what the tool diameter is
16:30.32MaloeranWell, it's low level and does what it's told I am assuming ; which is a good thing
16:30.33Twingyyep
16:30.33Twingynow emc has tried to bridge that gap
16:30.33Twingyand make the driver smarter
16:30.34Twingya little too smart in my opinion
16:30.34MaloeranYou probably lose some flexibility that way
16:30.34Twingywell, if you have a good cam package, all you need is a stupid driver
16:30.35Twingyif you have a crappy cam package, or you do g-code by hand (gasp) you need a smart driver
16:30.35Twingygcam is like a g-code compiler
16:30.35Twingyby pure definition, it's a compiler
16:30.36MaloeranEheh yes, a visual compiler in some ways too
16:30.36Twingyright
16:31.14Twingywith like 8 asm instructions :)
16:31.23Twingyvery analogous to coding an 8-bit pic chip
16:31.49Twingydoing floating point math (your csg cube) can be done, but it requires many instructions
16:37.17TwingyI suppose at some point one will be able to measure the efficiency of their code by the number of electrons required to solve the problem
16:41.37MaloeranI don'T think it is possible to compute the minimal electron count required to implement an algorithm within a context of hardware processing
16:59.57Twingytoday's current hardware, no
17:00.48Twingya practical measurement for today would be something around nano watts
17:09.56*** join/#brlcad Noobie (n=User@pool-71-240-238-151.fred.east.verizon.net)
17:10.23Noobieis anyone available?
17:10.46NoobieI need some help installing brlcad
17:11.06Noobiei'm using Knoppix as my OS so I'm not even sure if it is possible
17:22.37Twingyjust idle until you find somone
17:24.29Noobiewill do
18:30.19Noobiegotta go... out
18:30.25*** part/#brlcad Noobie (n=User@pool-71-240-238-151.fred.east.verizon.net)
23:08.11``Erikme too, when I play games.. but I did that before with my c64, heh :D
23:09.06TwingyI envision in like 20 years this disturbing looking cable with like 17 adapters on it
23:09.21Twingysticking 3 feet out of the back of the computer
23:09.27Twingyangled 30 degrees
23:09.35Twingyheld in with duct tape
23:10.10Twingywhose combined processing power is 1 week of a C64 just to send a character code
23:13.23``Erikhehehe
23:13.43``ErikI have new ps2 kbd's, but I like my old mitsumi precision din kbd a lot more *shrug*
23:14.12``Eriktho I do like the apple clear&white usb kbd's a lot
23:17.32Twingyyes, they are good
23:17.43TwingyI'm just amazed this natural touch has lasted under such abuse
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