On 12.07.2011 23:11, Vivian Meazza wrote:
> I would even sacrifice a few more fps for the sake of smoothness.
> For me the main issue is not so much the framerate, as the way the framerate
> is being delivered.

Indeed. Frame rate is misleading - the number only has a meaning if all 
frames were guaranteed to be evenly spaced (like on a TV/display). But 
that's not guaranteed for FG, so ignore this number.

In order to judge and compare visual quality, look at the worst-case 
delay in between two frames instead. If a single delay in between two 
frames is too high, the human eye immediately spots a "stutter". Doesn't 
help if all the other frames were produced at high rate. And if that 
stutter happens repeatedly (say every second), it's what limits visual 
quality.

You can enable a better property to compare performance using "View" => 
"Show worst-case frame delay". It shows the longest delay in between two 
frames within the last second of simulation (lower left corner). The 
lower the number, the better. In order to maintain an acceptable 25Hz 
simulation, the frame delay must never exceed 40ms.
Is anyone capable of running FlightGear with either global or local 
weather enabled with a frame spacing not exceeding 40ms?

cheers,
Thorsten

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