Is there a reasonable way to use numbers smaller than about 10^-6

[Geoff Canyon]

It's not a secret. I posted about a month ago in fair detail, but I'm doing
a space simulation, similar to Kerbal Space Program or Simple Rockets, but
with correct gravity (they both take shortcuts that appall me). I just
found out that the Animation Engine has a 3D projection function, so if
that tests out I'm going to switch from 2D to 3D. The end result should be
fairly simple visually, but with an accurate representation of every round
body in our solar system (about 50) all of them applying gravity correctly
and simultaneously to the rocket(s).

So far I have correct 2D gravity, export/import of universe definitions,
multiple simultaneous rockets, landing, taking off, and crashing. The
planets and moons run on set paths (I don't calculate their gravitational
interactions with each other). I need to at least change the paths from
circles to ellipses, or let them run freely. I need to finish converting to
km/s/kg from the abstract numbers I started with. I need to add atmosphere.
I need to real-ify the rockets (currently they are one-stage, crazy
powerful, and have unlimited fuel). And if I'm lucky, convert to 3D. And
start testing on an iPad (the eventual target).

And I will just say, orbits are hard.

gc


On Wed, Nov 20, 2013 at 12:28 PM, Roger Guay <irog at mac.com> wrote:

> This sounds very interesting, Geoff. Sure would like to know what you’re
> up to….
>
> Roger
>
>
> On Nov 20, 2013, at 10:21 AM, Geoff Canyon <gcanyon at gmail.com> wrote:
>
> > On Wed, Nov 20, 2013 at 10:53 AM, Richmond <richmondmathewson at gmail.com
> >wrote:
> >
> >>
> >> Ordinary math seems to peter out at 0.000001.
> >>>
> >>> This puts 8.100e-13: put format("%1.3e", (1e0)/(1234567890123e0))
> >>>
> >>> So is something like that the best way to go?
> >>>
> >>
> > My plan so far is just to do the math. If the result is 0, then increase
> my
> > timescale by 100,000 and try again. (and repeat as necessary) That way
> when
> > there is something overwhelming nearby, extremely distant/small objects
> > will have 0 effect, but if there is nothing nearby/large, then
> > smaller/farther objects will be applied across timescales that work for
> > them.
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