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Old 09-02-2003, 09:47 AM
tobin tobin is offline
WorldViz Team Member
Join Date: Feb 2003
Posts: 251
You are absolutely right about using horizontal span. In fact, using the other method (dual view) with nVidia hardware results in significantly slower performance because the rendering is not 100% OpenGL accelerated. Below is one of our tech notes on this issue.

But to address your concern about the distortion, a minor error in how Vizard computes the aspect ratio of multi-display systems has been discovered in the most recent release of Vizard R2 and has been corrected in the upcoming 2.11 release. A temporary work around is to multiply the viewport's aspect ratio by 2.0. In script form, apply an aspect ratio of 2.67 instead of the typical 1.33 of most displays:

# 50 deg horz. FOV, 2.67 horz-to-vert aspect ratio
viz.fov(50, 2.67)
We apologize for the inconvenience. Below is a fuller discussion of the nVidia issue:

Tech note on nVidia dual view versus horizontal span:
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