Just to reaffirm, this is a known issue with system times on Windows
system. You can do a search on System.currentTimeMillies or something
similar on the archive.
David wrote:
> We do our view changes and animations per frame, using elapsed time to
> calculate rotations in degrees/sec and movements in meters/sec. That way
> our scene stays consistant even if frame rates drop. But I had long felt
> things were not as smooth as they could be and never looked into it until
> now. Turns out that we are getting elapsed time from one frame to another
> of zero very often, causing our scene to be rendered exactly the same as
> several frames in a row, then a draw a new frame then a few copies, etc. It
> looks like at around 50 fps, I am getting 3 dups for every 1 real frame
> recalc. Course everything still looks right, but I am losing 3 steps of
> smoothness.
>
> For example if I am rotating my view at 90 degrees per second I am doing
> that in N steps, instead of N*4 steps, thus the rotation is not as smooth as
> it should be.
>
> At 50 fps, I am calculating a frame every 20 ms. I thought the
> System.currentTimeMillis() had a resolution of 5ms, but it looks like I am
> dead wrong. The numbers below look like 60ms, but its probably 50ms. How
> can I get the time to a better resolution?
>
> Dave Yazel
>
>
> In printing out the time stamps I get this:
>
> Frame got elapsed time of zero (last=983725910240, cur=983725910240 [1 min 7
> sec, 55mb]
> Frame got elapsed time of zero (last=983725910290, cur=983725910290 [1 min 7
> sec, 55mb]
> Frame got elapsed time of zero (last=983725910290, cur=983725910290 [1 min 7
> sec, 55mb]
> Frame got elapsed time of zero (last=983725910350, cur=983725910350 [1 min 7
> sec, 55mb]
> Frame got elapsed time of zero (last=983725910350, cur=983725910350 [1 min 7
> sec, 55mb]
> Frame got elapsed time of zero (last=983725910350, cur=983725910350 [1 min 7
> sec, 55mb]
> Frame got elapsed time of zero (last=983725910400, cur=983725910400 [1 min 7
> sec, 55mb]
> Frame got elapsed time of zero (last=983725910400, cur=983725910400 [1 min 7
> sec, 55mb]
> Frame got elapsed time of zero (last=983725910400, cur=983725910400 [1 min 7
> sec, 55mb]
> Frame got elapsed time of zero (last=983725910400, cur=983725910400 [1 min 7
> sec, 55mb]
> Frame got elapsed time of zero (last=983725910460, cur=983725910460 [1 min 7
> sec, 55mb]
> Frame got elapsed time of zero (last=983725910460, cur=983725910460 [1 min 7
> sec, 55mb]
> Frame got elapsed time of zero (last=983725910460, cur=983725910460 [1 min 7
> sec, 55mb]
> Frame got elapsed time of zero (last=983725910510, cur=983725910510 [1 min 7
> sec, 55mb]
> Frame got elapsed time of zero (last=983725910510, cur=983725910510 [1 min 7
> sec, 55mb]
>
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--
___________________________________________________________
Shawn Kendall Full Sail Real World Education
Course Director 3300 University BLVD
Real Time 3D for Gaming Winter Park FL 32792
[EMAIL PROTECTED] http://www.fullsail.com
___________________________________________________________
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