[osg-users] zoom and orthographic projections

2009-03-26 Thread Cory Riddell
I'm calling osg::Camera::setProjectionMatrixAsOrtho() and I'm getting an orthographic projection (this is, if I look directly at the face of a cube in wireframe, all I see is a square). I can rotate and pan, but zoom isn't working (I'm dragging the right mouse button). I want to allow the user to

Re: [osg-users] zoom and orthographic projections

2009-03-26 Thread Paul MARTZ
TrackballManipulator doesn't support zoom, it only supports moving the viewpoint forwards backwards, which has no visible effect in ortho. You'll need to create an event handler and have it modify the camera projection matrix. Paul Martz Skew Matrix Software On Mar 26, 2009, at 8:35 AM,

Re: [osg-users] zoom and orthographic projections

2009-03-26 Thread Paul MARTZ
Zoom in ortho is done by shrinking or expanding the view volume defined by the left right top bottom planes. Paul Martz Skew Matrix Software On Mar 26, 2009, at 8:35 AM, Cory Riddell c...@codeware.com wrote: I'm calling osg::Camera::setProjectionMatrixAsOrtho() and I'm getting an

Re: [osg-users] zoom and orthographic projections

2009-03-26 Thread Robert Osfield
Hi Cory, Orthographics views don't function like perspective ones, when you move near to the center, nothing actually changes w.r.t your view. This is normal and what you shoudl expect. If you want to simulate a perspective view by moving the left, right, top and bottom values of the projection

Re: [osg-users] zoom and orthographic projections

2009-03-26 Thread Cory Riddell
Hi Robert, Our app is a CAD app and all the views are external views of the model. I don't have any near/far plane issues. At first I thought I could simulate an orthographic view by moving the camera very far away then zooming in, but no. Anyway, I won't post to the list about this anymore.

Re: [osg-users] zoom and orthographic projections

2009-03-26 Thread Paul Martz
Of Robert Osfield Sent: Thursday, March 26, 2009 8:48 AM To: OpenSceneGraph Users Subject: Re: [osg-users] zoom and orthographic projections Hi Cory, Orthographics views don't function like perspective ones, when you move near to the center, nothing actually changes w.r.t your view. This is normal