[osg-users] Composite viewer & resize

[fabien rioli]

Hi All,

I'm currently having problems with the resize event redistribution with multiple views (in a composite viewer).
It seems that only one of the viewers receives the resize event.
See the attached example (.cpp) witch illustrate the problem (two viewers with a resize handler).
In the resise handlers I change the projection matrix in order to show witch view gets the event.
The following sreenshots shows different steps of the test.

1.jpg : no event
2.jpg : a first resize event ( the window have been moved)
3.jpg : a second resize event ( resise from the bottom right corner)

From what I have understood from osgViewer/CompositeViewer.cpp (in the eventTraversal) the viewer witch receives the event is the one who have the focus.
I think that because every viewer in the same window is affected by the resizing, the may have to receive the event each other.
Is this an intended behaviour ?

Thank you in advance,

Fabien

--
Fabien Rioli
www.tharsis-software.com

[Robert Osfield]

Hi Fabien,

Does osgcomposite resize correctly for you? i.e.

osgcompositeviewer cow.osg

I have just tried resizing and it all three views adjust their aspect
ratio correctly. This relies upon the Camera's projection matrices
being resized by the GraphicsContext itself, your own code shouldn't
need to handle the resize, unless of course you actually want to
implement some custom resize. You can control the resize behaviour of
the projection matrix via the Camera::setProjectionResizePolicy(..)
options are:

enum ProjectionResizePolicy
{
FIXED, /** Keep the projection matrix fixed, despite
window resizes.*/
HORIZONTAL, /** Adjust the HORIZOTNAL field of view on
window resizes.*/
VERTICAL /** Adjust the VERTICAL field of view on window resizes.*/
};

Robert.

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[fabien rioli]

On Tue, Jul 1, 2008 at 12:23 PM, Robert Osfield <robert....@gmail.com> wrote:

Hi Fabien,

Does osgcomposite resize correctly for you? i.e.

  osgcompositeviewer cow.osg

Thanks for your answer Robert.

Yes, the composite viewer does work fine for the aspect ratio. The projection matrices changes in my example were only here to show that the resize event wasn't send to the two viewers.

I work on an application with multiple viewers that needs to shows a grid of objects of a setted number of collums and lines.
I also need to display objects of the same ratio, so I change horizontal and vertical space between the objects to have the same number of objecst and keep their aspect. Sometimes the viewer with the grid gets the resize event, sometimes it's an other one, but never both of them.
 
Fabien.
 

--
Fabien Rioli - Directeur Commercial Tharsis-software
Portable: 06 76 96 59 98
Paris innovation 5 rue d'Uzès 75002 Paris Fixe: 01 40 13 53 49
www.tharsis-software.com

[Robert Osfield]

Hi Fabian,

osgViewer::CompositeViewer directs events to camera with focus. If
you want different behavior you can always override the
CompositeViewer::eventTravesals() method.

Robert.