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Old 08-28-2008, 02:55 PM
michaelrepucci michaelrepucci is offline
Join Date: Jul 2008
Posts: 53
frustum versus clip and fov

I'm not understanding the difference (if any) between using the MainWindow.frustum call and the MainWindow.clip and MainWindow.fov calls. I would have expected them to give the same result in the following code, but they don't. Does anyone know why?
clipPlanes = (0.1,10)
fov = 2*degrees(atan(screenHeight/(2*screenDistance)))
aspectRatio = viz.MainWindow.getSize(viz.WINDOW_PIXELS)[0]/viz.MainWindow.getSize(viz.WINDOW_PIXELS)[1]
topBottom = tan(radians(fov/2))*clipPlanes[0]


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Old 08-28-2008, 03:10 PM
michaelrepucci michaelrepucci is offline
Join Date: Jul 2008
Posts: 53
Oh, nevermind. My bad. These two commands do give the same result. But if you use viz.MainWindow.getSize(viz.WINDOW_PIXELS) before calling viz.go() you (obviously now) don't get the correct numbers. I'm actually glad I had two screens, and two different resolutions, or I might never have noticed that silly mistake.
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Old 08-28-2008, 11:50 PM
tobin tobin is offline
WorldViz Team Member
Join Date: Feb 2003
Posts: 251
Yes, there are very few commands that are valid prior to viz.go. Thanks for posting your answer.
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