To move the camera forwards or backwards, modify the modelview matrix -- in OSG,
a Camera manipulator will do this for you.
To zoom in and out (without moving the camera), change the field of view
parameter to the projection matrix. (I haven't looked at the code, but I believe
some Camera manipulator classes might provide a function to let you set the
field of view... I prefer to do this by explicitly setting the projection matrix
directly on the Camera.)
The two operations (moving the camera forward/backward, and zooming) are often
confused, but they produce very different visual effects.
-Paul
On 7/19/2012 2:12 PM, Dan Marshal wrote:
"(*) In perspective, the code allows you to move the eye forwards or backwards without
changing the FOV, so this is not a "zoom""
How to I change the distance from the camera without using the
TrackBallManipulator? All I want to do is a perspective move forward and
backward to the center of the screen and I don't see how to do this without
creating a custom manipulator which I do not want to do...
Thank you very much.
------------------
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http://forum.openscenegraph.org/viewtopic.php?p=48943#48943
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