[osg-users] Trackball and view question

Robert Osfield robert.osfield at gmail.com
Tue Sep 18 08:28:21 PDT 2007

Hi Bill,

The camera manipulators role is to modifying the view matrix so I'm a
bit perplexed that you are suprised by this.

Also please considering move from SimpleViewer up to osgViewer::Viewer
working as an embedded viewer in 2.x rather than using SimpleViewer as
it only existed for a short while and has been totally superseded.


On 9/18/07, Poirier, Guillaume <Guillaume.Poirier at nrc-cnrc.gc.ca> wrote:
> Hello everyone,
>  I am using a SimpleViewer. I set up a post draw callback on its main
> camera. In it
>  I read the camera eye, center, and up vectors. Initially, this give me (0,
> 0, 0),
>  (0, 0, -1), and (0, 1, 0) respectively. This is what I expect and it gives
> me a
>  particular view of my scene.
>  Now I add a trackball manipulator to the main camera and set up the view
> similar
>  to what I had previously. When I read back the data it is quite different.
> I would have
>  expected the same camera position / orientation than before since what I
> see is
>  similar. Unless the trackball affects the model position / orientation and
> not just
>  the view ? How can I use a trackball and read back in the post draw
> callback the
>  values I want ?
>  sincerely,
>  Bill
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