[osg-users] A question about zooming with orthographicprojection

[Paul Martz]

Agreed; this works. In perspective, you zoom bu changing the field of view;
in ortho you can achieve the same zoom effect  by altering the
left/right/bottom/top to display a larger/smaller view volume.
   -Paul

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From: osg-users-bounces at lists.openscenegraph.org
[mailto:osg-users-bounces at lists.openscenegraph.org] On Behalf Of Daniel Moos
Sent: Tuesday, March 18, 2008 1:06 PM
To: OpenSceneGraph Users
Subject: Re: [osg-users] A question about zooming with
orthographicprojection


Hi Ke Li 

You can implement a zooming functionality with the camera function
setProjectionMatrixAsOrtho(...)
We also use a orthographic projection in 3d. And we implement our zoom with
this nice function.

I hope this will help...
Have a nice evening!

Daniel Moos


Am 18.03.2008 um 19:55 schrieb Ke Li:




Dear all,
 
In the following post, Robert said that orthographic projection should be
avoided.
 
http://thread.gmane.org/gmane.comp.graphics.openscenegraph.user/7660/focus=7
664
 
But I know that some OpenGL applications do use orthographic projection with
zooming functionality. So I'm a little confused.
 
Can any one give me some enlightenment?
 
Thanks!
 
Ke Li



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