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
_____ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] 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 _____ Connect and share in new ways with Windows Live. Get it now! <http://www.windowslive.com/share.html?ocid=TXT_TAGHM_Wave2_sharelife_012008 > _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
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