This is for internal use only. Use opiSetup()
with
these Arguments and you will get the Value back.
A list containing err
which is NULL
for success, or some string description for fail.
is a list that could contain:
fixation
c(x,y,t)
where
x
is one of -20, -6, -3, 0, 3, 6, 20 degrees.
y
is 0 degrees.
t
is 0 for a spot fixation marker at c(x,y)
, or 1 for a
square centred on one of (-3,0)
, (0,0)
, (+3,0)
.
tracking_on
TRUE
for tracking on, FALSE
for off
Note: tracking will be relative to the PRL established with the fixation marker used at setup (call to OPI-OPEN), so when tracking is on you should use the same fixation location as in the setup.