I must be missing something then. When I set the master camera's view to be 95
degrees, I get a 95 degree field of view across all three cameras.
Also, whatever I set the offsets to, I just get really wacky results ( with an
offset of 10 degrees, I get no overlap between cameras, and trackball rotations
go in opposite directions for 2 out of the three camera )
Maybe someone with better eyes can see my mistake:
void
ViewingWindowQt::initializeCameras( int nCameras )
{
numCameras = nCameras;
widgets = new QWidget*[ numCameras ];
_x_focal_length.resize( numCameras );
_y_focal_length.resize( numCameras );
_use_distortion.resize( numCameras );
_bottom_texcoord.resize( numCameras );
// Just added here to see what would happen
// 95 degree view *across* all three cameras, not per camera
getCamera()->setProjectionMatrixAsPerspective( 95.0f, 1.0, 0.1, 10000.0 );
for ( int i = 0; i < numCameras; i++ )
{
_x_focal_length[i] = 1.0f;
_y_focal_length[i] = 1.0f;
_bottom_texcoord[i] = osg::Vec2( -0.5f, -0.5f );
_use_distortion[i] = true;
widgets[ i ] = addViewWidget( multipleWindowWithDistortion( true, i,
numCameras ) );
}
for ( int i = 0; i < numCameras; i++ )
widgets[ i ]->show();
connect( &_timer, SIGNAL( timeout() ), this, SLOT( paintEvent() ) );
_timer.start( 10 );
}
....
osg::Camera*
ViewingWindowQt::multipleWindowWithDistortion( bool multipleScreens, int i, int
numCameras )
{
osg::GraphicsContext::WindowingSystemInterface* wsi =
osg::GraphicsContext::getWindowingSystemInterface();
osg::Node* sceneData = getSceneData();
wsi->getScreenResolution(osg::GraphicsContext::ScreenIdentifier(0), _width,
_height);
double aspectRatioScale = (double)numCameras;
double translate_x = double(numCameras)-1 + i * -2.0;
osg::ref_ptr<osg::GraphicsContext::Traits> traits = new
osg::GraphicsContext::Traits;
traits->screenNum = multipleScreens ? i+1 : 0;
traits->x = (i*_width)/numCameras;
traits->y = 0;
traits->width = _width/numCameras;
traits->height = _height;
traits->windowDecoration = false;
traits->doubleBuffer = true;
traits->sharedContext = 0;
osg::ref_ptr<osg::Camera> camera = new osg::Camera;
GraphicsWindowQt* gwqt = new GraphicsWindowQt( traits.get() );
camera->setGraphicsContext( gwqt );
camera->setClearColor( _clearColor );
gwqt->setClearColor( _clearColor );
gwqt->setClearMask(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
camera->setViewport(new osg::Viewport(0,0, (_width/numCameras), _height));
GLenum buffer = traits->doubleBuffer ? GL_BACK : GL_FRONT;
camera->setDrawBuffer(buffer);
camera->setReadBuffer(buffer);
osg::Node* data = createDistortionSubgraph( i, sceneData, _clearColor );
camera->addChild( data );
// Original
addSlave(camera.get(), osg::Matrix::scale(aspectRatioScale, 1.0, 1.0)*
osg::Matrix::translate(translate_x, 0.0, 0.0), osg::Matrix(), false
);
// Tried this and various other combinations
// addSlave(camera.get(), osg::Matrix::scale(aspectRatioScale, 1.0, 1.0),
// osg::Matrix::rotate(-10.f + i*10.f, 0.f, 1.f, 0.f ),
false );
return camera.release();
}
Mark A. Bolstad
Scientific Computing
Janelia Farm Research Campus
Howard Hughes Medical Institute
19700 Helix Drive, Ashburn, VA 20147
email: [email protected]
office: +1.571.209.4623
web: http://www.hhmi.org/janelia/
On Nov 15, 2010, at 9:09 PM, Ulrich Hertlein wrote:
> On 16/11/10 12:54 , Bolstad, Mark wrote:
>> If I set the master camera's FOV, do the slaves inherit that value?
>
> Yes, slave cameras inherit the master camera's view *and* projection matrices
> (with
> optional offsets).
>
> /ulrich
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