Hi,
I've been having trouble implementing slave cameras for an application I'm
working on. The camera gets its position and orientation from a motion tracking
system or through joystick input. When I don't set up slave cameras, the camera
properly responds to input. However, when I implement slave cameras, they do
not update their position or orientation with input from the motion tracking or
joy stick.
In the code below, if I comment out the code that sets up the slave cameras,
the viewer responds properly to input from the joystick or the motion tracker.
If it is not commented, the slave cameras will display, but they will not
respond to the motion tracker or joystick. If anyone could provide any
suggestions, they would be much appreciated.
Thank you!
rjkern
Code:
viewer = new FLTViewer(arguments); //FLTViewer is and extension of the
osgViewer::Viewer class. It receives the camera position and orientation from a
server program.
//Here is where I set up the slave camera
int xoffset = 40;
int yoffset = 40;
// left window + left slave camera
{
osg::ref_ptr<osg::GraphicsContext::Traits> traits = new
osg::GraphicsContext::Traits;
traits->x = xoffset + 0;
traits->y = yoffset + 0;
traits->width = 600;
traits->height = 480;
traits->windowDecoration = true;
traits->doubleBuffer = true;
traits->sharedContext = 0;
osg::ref_ptr<osg::GraphicsContext> gc =
osg::GraphicsContext::createGraphicsContext(traits.get());
osg::ref_ptr<osg::Camera> camera = new osg::Camera;
camera->setGraphicsContext(gc.get());
camera->setViewport(new osg::Viewport(0,0, traits->width,
traits->height));
GLenum buffer = traits->doubleBuffer ? GL_BACK : GL_FRONT;
camera->setDrawBuffer(buffer);
camera->setReadBuffer(buffer);
// add this slave camera to the viewer, with a shift left of
the projection matrix
viewer->addSlave(camera.get(),
osg::Matrixd::translate(1.0,0.0,0.0), osg::Matrixd::rotate(45, Vec3f(1,0,0)));
}
// right window + right slave camera
{
osg::ref_ptr<osg::GraphicsContext::Traits> traits = new
osg::GraphicsContext::Traits;
traits->x = xoffset + 600;
traits->y = yoffset + 0;
traits->width = 600;
traits->height = 480;
traits->windowDecoration = true;
traits->doubleBuffer = true;
traits->sharedContext = 0;
osg::ref_ptr<osg::GraphicsContext> gc =
osg::GraphicsContext::createGraphicsContext(traits.get());
osg::ref_ptr<osg::Camera> camera = new osg::Camera;
camera->setGraphicsContext(gc.get());
camera->setViewport(new osg::Viewport(0,0, traits->width,
traits->height));
GLenum buffer = traits->doubleBuffer ? GL_BACK : GL_FRONT;
camera->setDrawBuffer(buffer);
camera->setReadBuffer(buffer);
// add this slave camera to the viewer, with a shift right of
the projection matrix
//viewer->addSlave(camera.get(),
osg::Matrixd::translate(-1.0,0.0,0.0), osg::Matrixd());
viewer->addSlave(camera.get(),
osg::Matrixd::translate(-1.0,0.0,0.0), osg::Matrixd::rotate(45, Vec3f(1,0,0)));
}
//create socket and set up connections.
viewer->initRecvSocket();
//Load the scene model
viewer->setScene(viewer->file_name);
osg::Group* rootnode;
rootnode = viewer->getRootNode();
if (!rootnode)
{
return -1;
}
viewer->initPerspective(); //initialize the perspective
viewer->startDataTransfer();
viewer->setCamera(osg::Vec3(0,0,1),osg::Vec3(0,1,0),osg::Vec3(-1,0,0),osg::Vec3(0,0,1));
while( !viewer->done() )
{
viewer->frame();
}
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=35932#35932
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