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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