[visionegg] flicker due to an abrupt change of phase?

Hi Andrew,

We have been using gratingTCP.py to remotely display a stimulus
synchronized with the microscope image acquisition. The program
controlling the image acquisition sends the description of the
stimulus to the computer producing the stimulus. The stimulus itself
consists of a grating that is first static (tf=const(0)), and then
moves across the screen (tf=const(1.5)). We coded the two phases of
the stimulus (static grating, moving grating) with the same
parameters, except obviously for the temporal frequency.

Our problem is that once the moving grating is presented, it shows a
different phase from the static grating, which causes a undesired
"flicker". This happens even if we define an equal phase parameter for
both stimuli .

Do you have an idea on how we could avoid the flicker, and have a
continuous transition from static to moving grating?

All the best,
Alexandre Santos
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