Dear Claudio,
Please read this page. I think it answers your question.
http://www.freelists.org/archives/visionegg/01-2007/msg00025.html
Claudio Arduino wrote:
I have a question about the latency between when an instruction changing
the scene graph is issued and when the effect of that instruction is
visible on the screen.
I'm using a very simple application (OSG 2.0) with a very simple scene
graph made by a square with a white face and a black face, running at 75
fps with vsync enabled on the graphic card; ever every 30 frames two
instruction are issued:
1 a rotation instruction provoking a color change from black to white on
the whole screen
2 a character is sent on the serial port
I'm measuring whith an oscilloscope the time elapsed from the beginning
of the electric signal on the serial port and the pattern change in the
electric signal on the VGA Red signal line due to the black to white
transition; the result is that it takes two frames for a change to be
visible on the screen (the measured time is around 26 ms) when OSG
viewer is configured in single thread.
Does someone know why there are two frames of delay instead of one?
(please note that we are not using triple buffering on the graphic card)
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