anaglyphic stereo, backprojection & screendistance

[malte]

Hello all,
I have a question regarding anaglyphic stereo (red/green): We do have backrojection system and want to use anaglyphic stereo. To increase viewers' FOV, they will be seated rather close to the projection screen. The simulated FOV matches viewers' physical FOV (~90° hor x 75° vert).
If I now play around with the screendistance settings (vizcore.cfg: e.g. viz.screenDistance = 1), the distance for which the anaglyphic stereo is calculated changes (the manipulations do in principle work). However, it changes in ways I do not understand. Maybe I am missing something. Originally, I thought that I just have to measure the viewers' distance from the backprojection screen and use this as the screendistance (does not work). Is it possible that the large physical FOV is causing the problems?
Thanks for feedback!
-Jan

[farshizzo]

Are you saying the screen distance value is having no affect on the stereo separation? What exactly is not working about it? Also, you can specify the screen distance value directly in your script by using the following code:viz.MainWindow.screenDistance(0.5)

[malte]

thanks farshizzo,
the screen distance value has an affect on stereo separation. I am just not able to set it such that it works correctly. Measuring the viewers' distance from the screen and setting this as screendistance does not seem to give the correct stereo spearation. I tried a lot of different values but I do not understand how the stereo separation changes when I change the screendistance value. Well, I keep trying.

[farshizzo]

As you increase the screen distance value, the stereo separation should decrease. You say the stereo separation is incorrect. How so? Can you be more specific? Are you specifying the screen distance value in meters? The following page describes how stereo rendering is performed in Vizard, http://www.worldviz.com/vizhelp/Stereo_rendering.htm

[mspusch]

see also

http://www.worldviz.com/vizhelp/VizHelp.htm#Perspective_rendering.htm