IECore::CameraPtr GafferScene::camera( const ScenePlug *scene, const ScenePlug::ScenePath &cameraPath, const IECore::CompoundObject *globals )
{
ConstCompoundObjectPtr computedGlobals;
if( !globals )
{
computedGlobals = scene->globalsPlug()->getValue();
globals = computedGlobals.get();
}
std::string cameraName;
ScenePlug::pathToString( cameraPath, cameraName );
if( !exists( scene, cameraPath ) )
{
throw IECore::Exception( "Camera \"" + cameraName + "\" does not exist" );
}
IECore::ConstCameraPtr constCamera = runTimeCast<const IECore::Camera>( scene->object( cameraPath ) );
if( !constCamera )
{
std::string path; ScenePlug::pathToString( cameraPath, path );
throw IECore::Exception( "Location \"" + cameraName + "\" is not a camera" );
}
IECore::CameraPtr camera = constCamera->copy();
camera->setName( cameraName );
const BoolData *cameraBlurData = globals->member<BoolData>( "option:render:cameraBlur" );
const bool cameraBlur = cameraBlurData ? cameraBlurData->readable() : false;
camera->setTransform( transform( scene, cameraPath, shutter( globals ), cameraBlur ) );
applyCameraGlobals( camera.get(), globals );
return camera;
}
void updateViewportCameraAndOverlay()
{
if( !m_viewportCameraDirty )
{
return;
}
if( !m_lookThroughCamera )
{
m_overlay->setResolutionGate( Box2f() );
m_overlay->setVisible( false );
return;
}
// The camera will have a resolution and screen window set from the scene
// globals. We need to adjust them to fit the viewport appropriately, placing
// the resolution gate centrally with a border around it. Start by figuring
// out where we'll draw the resolution gate in raster space.
IECore::CameraPtr camera = m_lookThroughCamera->copy();
const float borderPixels = 40;
const V2f viewport = m_view->viewportGadget()->getViewport();
const V2f insetViewport(
max( viewport.x - borderPixels * 2.0f, min( viewport.x, 50.0f ) ),
max( viewport.y - borderPixels * 2.0f, min( viewport.y, 50.0f ) )
);
const float insetViewportAspectRatio = insetViewport.x / insetViewport.y;
const V2f resolution = camera->parametersData()->member<V2iData>( "resolution" )->readable();
const float pixelAspectRatio = camera->parametersData()->member<FloatData>( "pixelAspectRatio" )->readable();
V2f resolutionGateSize = resolution;
resolutionGateSize.x *= pixelAspectRatio;
const float resolutionGateAspectRatio = resolutionGateSize.x / resolutionGateSize.y;
if( resolutionGateAspectRatio > insetViewportAspectRatio )
{
// fit horizontally
resolutionGateSize *= insetViewport.x / resolutionGateSize.x;
}
else
{
// fit vertically
resolutionGateSize *= insetViewport.y / resolutionGateSize.y;
}
const V2f offset = ( viewport - resolutionGateSize ) / 2.0f;
m_overlay->setResolutionGate( Box2f( V2f( offset ), V2f( resolutionGateSize + offset ) ) );
m_overlay->setCropWindow( camera->parametersData()->member<Box2fData>( "cropWindow" )->readable() );
m_overlay->setCaption( boost::str( boost::format( "%dx%d, %.3f, %s" ) % resolution.x % resolution.y % pixelAspectRatio % camera->getName() ) );
m_overlay->setVisible( true );
// Now modify the camera, so that the view through the resolution gate we've calculated
// represents the rendered image - this means extending the resolution and screen
// window to account for the border area outside the resolution gate.
Box2f &screenWindow = camera->parametersData()->member<Box2fData>( "screenWindow" )->writable();
const V2f newScreenWindowSize = screenWindow.size() * viewport / resolutionGateSize;
const V2f screenWindowCenter = screenWindow.center();
screenWindow.min = screenWindowCenter - newScreenWindowSize / 2.0f;
screenWindow.max = screenWindowCenter + newScreenWindowSize / 2.0f;
camera->parameters()["resolution"] = new V2iData( m_view->viewportGadget()->getViewport() );
m_view->viewportGadget()->setCamera( camera.get() );
m_view->viewportGadget()->setCameraEditable( false );
}