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Rec.Autos.Simulators Archive

Car Physics: a roll down memory lane

3 posts by 3 people · 22 Jul 2001 04:08 UTC - 23 Jul 2001 16:59 UTC

Doug Milliken 22 Jul 2001 04:08 UTC#172070
Just came across this site -- can your model do this? Take a look at: <http://jmp.buffnet.net/astro.htm> The modeling (non-realtime, of course) was done in Fortran on an IBM 360. 3-d vector graphics with a "panning camera" were filmed frame-at-a-time off a tube and played back in realtime with a movie projector. When the driver hit the marks (position and speed) the visual correlation between animation and reality was excellent. I watched several of the development jumps when I was in high school... The Bond car is still at JM Productions, south of Buffalo, NY USA. -- Doug Milliken Milliken Research Associates Inc.
Very cool. There's a section on this in your book, right? My model can't do this accurately yet because I'm still using a Euler angle simplification for rotation, without the correct matrix/quat methods to keep angular momentum conservation in the system. In other words, my car won't rotate/tumble correctly once it leaves the ramp. I think I'm not too far off from being able to do this though, although I wouldn't want to drive the real thing through the spiral jump! I've got a buddy that's crazy enough to try it though :-) Todd Wasson --- Performance Simulations Drag Racing and Top Speed Prediction Software http://PerformanceSimulations.Com
On Sun, 22 Jul 2001 04:08:03 GMT, Doug Milliken <[email hidden]> wrote: > >Just came across this site -- can your model do this? Take a look at: > > <http://jmp.buffnet.net/astro.htm> Gee, I don't know. :) One of the first goals of my Racer was to recreate a sort of modern Stunt Car Racer. Although with these kinds of stunts, you sure have to build in some arcade features to not get a total-loss car every time! Should work in principle though; I've got quaternion rotation, although the carcam's might not hold up trying to follow the car. Nothing a trackcam couldn't fix though. If somebody feels inspired to do a little track on this with Max or something... :) Cool stuff. Dukes of Hazzard style, only better. Ruud van Gaal, GPL Rank +53.25 Pencil art : http://www.marketgraph.nl/gallery/ Free car sim : http://www.marketgraph.nl/gallery/racer/

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