/usr/share/psychtoolbox-3/PsychGLImageProcessing/DisplayUndistortionSphere.m is in psychtoolbox-3-common 3.0.11.20140816.dfsg1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | function DisplayUndistortionSphere(varargin)
% Create geometric display calibration file for projection onto a sphere.
%
% CAUTION: This function isn't properly implemented yet and will likely
% not work for you as expected. Stay tuned...
%
% This is just a wrapper around DisplayUndistortionHalfCylinder() which
% does the actual work for both half-cylindrical and half-spherical
% projection screens.
%
fprintf('I am calling DisplayUndistortionHalfCylinder() now. Please answer\n');
fprintf('the following question by typing an "s" for spherical correction.\n');
DisplayUndistortionHalfCylinder(varargin{:});
return;
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