[osg-users] setProjectionMatrixAsPerspective changes eyepoint when camera is rotated

[Sebastian Messerschmidt]

Hi Mike,

Where and when are you updating the projection?
Also you can hook into the near-far computation callback to modify the 
calculated values.
Cheers
Sebastian
> Hi,
>
> I am trying to manually effect near and far clipping planes based on camera altitude in my app. Essentially, I do this:
>
> Camera()->getProjectionMatrixAsPerspective(_fov,_ratio,_near,_far);
>
> Then based on some criteria, I might change the near or far clip planes.
>
> _near = _nearNew;
> _far - _farNew;
>
> I then try to reset using
>
> Camera()->setProjectionMatrixAsPerspective(_fov,_ratio,_nearNew,_farNew);
>
> which works fine IF the original camera is not rotated, However, if the camera is rotated by, say , 90 degrees, prior to the calls, then the view after the get/set combo moves the eyepoint down by a factor equal to the aspect ratio of the screen.
>
> Thank you!
>
> Cheers,
> Mike
>
> ------------------
> Read this topic online here:
> http://forum.openscenegraph.org/viewtopic.php?p=65410#65410
>
>
>
>
>
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