# Switch between stereoscopic and monoscopic viewing at runtime.

**URL:** <https://psychtoolbox.discourse.group/t/switch-between-stereoscopic-and-monoscopic-viewing-at-runtime/778>\
**Category:** Uncategorized\
**Created:** [August 6, 2010, 9:25am UTC](https://psychtoolbox.discourse.group/t/switch-between-stereoscopic-and-monoscopic-viewing-at-runtime/778 "2010-08-06T09:25:33Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![asefv](https://avatars.discourse-cdn.com/v4/letter/a/2bfe46/32.png) [@asefv](https://psychtoolbox.discourse.group/u/asefv)\
**Post date:** [August 6, 2010, 9:25am UTC](https://psychtoolbox.discourse.group/t/switch-between-stereoscopic-and-monoscopic-viewing-at-runtime/778/1 "2010-08-06T09:25:33Z")

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Hi everyone,  
  
I have got a problem here. I want to show a movie stereoscopicly in some trials, and monoscopicly in others. After using  
  
Screen('OpenWindow',..., stereomode = 9,...)  
  
can I switch the openinng window to monoscopic viewing runtime?  
  
I found a command as makeshift in follewing:  
  
overlaywindow = SetAnaglyphStereoParameters('CreateMonoOverlay', win);  
  
But it works like putting a monoscoptic curtain to the stereoscopic screen. The original screen still exists!  
  
Is there any better idea I can switch the window mode between stereoscopic and monoscopic viewing?  
  
Thanks!  
  
asefv