Hello,
I am trying to use a slave camera in my viewer to follow a node and render what
it sees to a pixel buffer, then I convert the images to cv::Mat to do image
processing on them. It is a simulation of a robot setup were the camera is
rigidly attached to the robot. I have managed to get it mostly working using
advice from the forum and the osgscreencapture example but am stuck on a
strange little thing. I gather that I need to manually update the _viewOffset
of the slave each frame so that it can move around with the robot.
Code:
std::int64_t M_OSG_viewer::Draw(void)
{
_last_draw_time_us = _last_draw_timer.Get_elapsed_us();
if(_has_slave_cam)
{
osg::View::getSlave(0)._viewOffset =
osgViewer::Viewer::getCamera()->getInverseViewMatrix()
*_slave_cam_xform->getMatrix()
*osg::Matrix::rotate( -osg::PI/2.0, 1.0, 0.0, 0.0 );
}
if(_last_draw_time_us > 8333)
{
osgViewer::Viewer::getViewerBase()->frame();
_last_draw_timer.Restart();
}
return _last_draw_time_us;
}
When I do this it does work but if I use the mouse to manipulate the view of
the scene it will move/shift the images from the PBO a bit, that is, it will
not stay still. Does anyone know why this would be, is it just round off error?
Is there a better approach?
Thanks, Patrick
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=58615#58615
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