Hi,
i noticed a strange (buggy?) behavior with two cameras sharing the
same Viewport instance with version 2.9.5 (Windows XP).
Situation: Main camera, adding a slave camera (with addSlave) and
setting the slave camera's viewport with this line of code:
slaveCamera->setViewport( viewer.getCamera()->getViewport());
The objective is to have two cameras rendering to the whole window
Problem: If the viewer is in window mode (setUpViewInWindow) and
the window is resized, the viewport updates incorrectly. In my case,
it doesn't fill the window.
I suspect this behaviour is due to
GraphicsContext::resizedImplementation having updated the viewport
twice, since it is share between the two cameras.
Workaround: Don't share the viewport between two cameras :)
slaveCamera->setViewport(new
osg::Viewport(*(viewer.getCamera()->getViewport())));
or
osg::Viewport* vp = viewer.getCamera()->getViewport();
slaveCamera->setViewport(vp->x(), vp->y(), vp->width(),
vp->height());
If this use isn't as expected (i use it wrong) or if
resizedImplementation need to be fixed, then i could try do the job
and submit a patch for this odd behaviour. At least i could modify
Camera and add some comments regarding this behavior. But first i
wanted to know experts advise about it.
Best regards,
Himar.
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