Screen('glPushMatrix')

Psychtoolbox › Screen.{mex*,dll} subfunction

Store a backup copy of active current OpenGL matrix on the matrix stack for
later reuse. The capacity of the matrix backup stack is limited, typically not
more than 27 slots. For each call to glPushMatrix you need to call glPopMatrix
at the appropriate place to avoid overflowing the stack. See
<http://www.opengl.org/documentation/red_book_1.0/> Chapter 4 for detailed
information.

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information.

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information.

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