Andy Ross <[EMAIL PROTECTED]> said:

> Yes, but even between iterations, the FPU error introduces a random
> 3mm value to the positions you are using.  It doesn't matter whether
> the FDM is right or wrong -- even the tiniest different in input
> values will result in a 3mm jitter.  If the FDM says that the position
> is different by 4.44E-16 meters (the minimum delta value in a double
> for a position value of 1m), the output will randomly get moved up to
> 3mm.
I know, just wanted to make sure we were on the same page.
 
> Also, not offense intended, but you still seem to be missing the core
> point: the cockpit is locked down to the aircraft position by
> definition.  No change in position, of any magnitude whatsoever,
> should produce any detectable change in the cockpit pixels on the
> screen.

Yes, I am aware of that.  That's where I started with the "jitter testing"
thread last night.  See second paragraph of:
http://mail.flightgear.org/pipermail/flightgear-devel/2002-June/008703.html

So no offense taken, since you were wrong: I didn't miss the core point :-D

Drawing the cockpit without that translation at all would eliminate the
jitter, of course.

Best,

Jim

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