# BitsStereoDemo **URL:** \ **Category:** Uncategorized\ **Created:** [April 19, 2016, 3:45pm UTC](https://psychtoolbox.discourse.group/t/bitsstereodemo/592 "2016-04-19T15:45:48Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![smgxjas](https://avatars.discourse-cdn.com/v4/letter/s/e9a140/32.png) [@smgxjas](https://psychtoolbox.discourse.group/u/smgxjas)\ **Post date:** [April 19, 2016, 3:45pm UTC](https://psychtoolbox.discourse.group/t/bitsstereodemo/592/1 "2016-04-19T15:45:48Z")
can anyone get this to work? with the latest PTB, on my latest Mac, running the latest version of OS X, i get: > \>\> BitsStereoDemo PTB-INFO: Retina display. Enabling panel fitter for scaled Retina compatibility mode. PTB-INFO: This is Psychtoolbox-3 for Apple OS X, under Matlab 64-Bit (Version 3.0.12 - Build date: Feb 19 2016). PTB-INFO: Support status on this operating system release: OSX 10.11 Supported. PTB-INFO: Type 'PsychtoolboxVersion' for more detailed version information. PTB-INFO: Most parts of the Psychtoolbox distribution are licensed to you under terms of the MIT License, with PTB-INFO: some restrictions. See file 'License.txt' in the Psychtoolbox root folder for the exact licensing conditions. PTB-INFO: Installation of the PsychtoolboxKernelDriver is strongly recommended if you care about precise visual PTB-INFO: onset timestamping or timing. See 'help PsychtoolboxKernelDriver' for installation instructions. PTB-INFO: Fixed point precision integer framebuffer enabled. PTB-INFO: OpenGL-Renderer is NVIDIA Corporation :: NVIDIA GeForce GT 650M OpenGL Engine :: 2.1 NVIDIA-10.10.5.2 310.42.25f01 PTB-INFO: Renderer has 1024 MB of VRAM and a maximum 1024 MB of texture memory. PTB-INFO: VBL startline = 1800 , VBL Endline = -1 PTB-INFO: Beamposition queries unsupported or defective on this system. Using basic timestamping as fallback: Timestamps returned by Screen('Flip') will be less robust and accurate. PTB-INFO: Measured monitor refresh interval from VBLsync = 0.000000 ms [inf Hz]. (0 valid samples taken, stddev=0.000000 ms.) PTB-INFO: Small deviations between reported values are normal and no reason to worry. PTB-INFO: All display tests and calibrations disabled. Assuming a refresh interval of 60.000000 Hz. Timing will be inaccurate! PTB-INFO: Psychtoolbox imaging pipeline starting up for window with requested imagingmode 33793 ... PTB-INFO: Will use 8 bits per color component framebuffer for stimulus drawing. PTB-INFO: Enabling panel fitter. Providing virtual framebuffer of 1440 x 900 pixels size. PTB-INFO: Will use 8 bits per color component framebuffer for stimulus post-processing (if any). Calculating angle 1 Error in function MakeTexture: Invalid Window (or Texture) Index provided: It doesn't correspond to an open window or texture. Did you close it accidentally via Screen('Close') or Screen('CloseAll') ? WARNING: This session of your experiment was run by you with the setting Screen('Preference', 'SkipSyncTests', 2). WARNING: This means that some internal self-tests and calibrations were skipped. Your stimulus presentation timing WARNING: may have been wrong. This is fine for development and debugging of your experiment, but for running the real WARNING: study, please make sure to set Screen('Preference', 'SkipSyncTests', 0) for maximum accuracy and reliability. Error using Screen Usage: textureIndex=Screen('MakeTexture', WindowIndex, imageMatrix [, optimizeForDrawAngle=0] [, specialFlags=0] [, floatprecision=0] [, textureOrientation=0] [, textureShader=0]); Error in BitsStereoDemo (line 96) left(orient)= Screen('MakeTexture',whichScreen,image); ---
**Author:** ![mariokleiner](https://avatars.discourse-cdn.com/v4/letter/m/13edae/32.png) [@mariokleiner](https://psychtoolbox.discourse.group/u/mariokleiner)\ **Post date:** [April 20, 2016, 7:39pm UTC](https://psychtoolbox.discourse.group/t/bitsstereodemo/592/2 "2016-04-20T19:39:59Z")
The specific error is that ...     left(orient)= Screen('MakeTexture',whichScreen,image); ... passes in 'whichScreen' instead of 'window' as it should. If that demo ever worked, then only in very early PTB-3 versions and due to a bug in the toolbox. But the whole demo is a huge pile of wrong comments, wrong practices and inefficiency and would need a complete rewrite. It actually shouldn't even exist nowadays and our own standard stereo support code should take care of this. -mario ---
**Author:** ![smgxjas](https://avatars.discourse-cdn.com/v4/letter/s/e9a140/32.png) [@smgxjas](https://psychtoolbox.discourse.group/u/smgxjas)\ **Post date:** [May 16, 2017, 2:07pm UTC](https://psychtoolbox.discourse.group/t/bitsstereodemo/592/3 "2017-05-16T14:07:43Z")
Greetings All. (For the first time in a decade or so) I tried the PTB function BitsStereoDemo. (I'm using a mac. Latest OS, 2017 PTB, Bits++ and FE1 goggles.) I get the following error messages: Error using bitsGoggles Too many output arguments. Error in BitsPlusPlus (line 1739) Tlockdata = bitsGoggles(1, 0); Error in BitsStereoDemo (line 35) BitsPlusPlus('UseFE1StereoGoggles', window, 1); Any ideas? Thanks -- Joshua A. Solomon [http://www.staff.city.ac.uk/~solomon/](http://www.staff.city.ac.uk/~solomon/)