CompuServe Thread

Sunpath question.

5 messages in this thread
#60882From: Gus GrubbaOct 9, 1993 5:32 AM
I got (sort off) the tracking thing to work. I still have to work several problems. First of all, for simplicity sake, I am calculating everything centered around the Sun (heliocentric). This is showing the dance of the planets, comets, asteroids and whatever else you want in the middle but it will be hard to give you anything beyond our solar system. The second problem is scaling. 3DS won't handle numbers that large (it's not 3DS's fault, Gary never imagined someone would actually try to render the universe in 1:1 scale…). Because everything is real, you obviously can't see everything. I have to be able to define some scaling and a better way of entering data. I can't way to get a hold of the IPAS code… I actually have two "variations" of the main program. In one, I've added an option to read standard NORAD data files to track simple objects orbiting around the Earth. This is Geocentric and works pretty much like the stuff you have. The second one you have to supply an ASCII file with several data items to localize an object (Standard Epoch, inclination, mean anomalies, etc.). This one works in reverse. They are plotted centered at the Sun. Right now it's a pain to create several DXF path files. I want to be able to create the objects and their paths all at once. Things I should be able to do when IPAS R3 arrives. This will allow to define all sorts of things. Even ballistics (Alec will love this one, even though Tridents are more likely than a mere .38! Who knows, he may be hired to reconstitute the apocalypse… <g>). By the way, just for fun, create a path for the Sun and another for the moon. Date the thing for July 11 1992 and tell the program you are in Hawaii. Attach a spot light to the Sun path and an opaque sphere to the moon. Give them the right proportion (400×400) and run your very own eclipse! Link a camera to the Sun looking down at the Earth and see the Eclipse path!
#61018From: John K. JordanOct 10, 1993 1:00 AM
Hey GUS – G(alactic) U(ser) S(oftware), >>solar system… I am drooling all over myself and ready to drive to Oregon with my floppy disk. Better yet, I'll send a goon squad to the Yost Group and threaten to beat them with unopened copies of Intergraph until they get the new IPAS released. <g> >>user interface… There seems to be a lot of room for improvement in the current IPAS based on what I see in the current end products. The R3 promise sounds like major fun – I may break down and get this one myself. (I have an older Pharlap & MetaWare so I'd have to upgrade) >>scaling… Yikes, I never thought of that one. Hey, did you ever see the solar system DWG done to scale that used to come with AutoCAD? From Pluto's orbit you could zoom down and read the plaque on the lunar module! Now that's what I call excess. A little off the subject, today I got the new Delorme Street Atlas CD-ROM, or actually, the Map Expert. (every street in the US + a bunch of other features) It says that the northwestern corner of my yard is at N 36deg 3' 14.99" – W 84deg 13' 8.24". (I haven't checked the accuracy yet.) They advertise a GPS interface to give real-time map positioning on your laptop as you move around. JKJ (feeling an eclipse comming on…)
#61029From: Gus GrubbaOct 10, 1993 5:32 AM
Of course I remember the solar system DWG (I am an ACAD user since 85 – well, let me put this way, I own ACAD since then but it is still a long shot before I can say I'm an ACAD user…). That came to mind when I started noticing the scaling problems. Regardless, this is pretty fun. Where else can you prove Einstein wrong and move from point A to point B at about 100 times the speed of light? Hey, what would happen if I started to move around the Sun in counter orbit at extremely high speed. Would the animation end up where it started? He, he, I may have found a "Virtual Paradox"… Hey, interesting thing that Map program. NASA should have included that in the space probe they lost. At least it could find its way back (actually, I heard the probe got eaten by that face in Mars – highest level source – "The National Enquirer"). Oh well, I'd better get to bed after that one…
#61306From: Schreiber InstrumentsOct 12, 1993 12:59 AM
Gus, A high speed orbit around the sun and you might wind up using R1 again. A cause for thought. Keith.
#61455From: Oct 12, 1993 11:56 PM
>> A high speed orbit around the sun and you might wind up using R1 again. Good thought! Although his ideas are sometimes a bit 'out of this world' as it is! <g> Greg Pyros