osg::Vec3f CSVRender::WorldspaceWidget::getIntersectionPoint (const QPoint& localPos,
unsigned int interactionMask, bool ignoreHidden) const
{
// (0,0) is considered the lower left corner of an OpenGL window
int x = localPos.x();
int y = height() - localPos.y();
osg::ref_ptr<osgUtil::LineSegmentIntersector> intersector (
new osgUtil::LineSegmentIntersector (osgUtil::Intersector::WINDOW, x, y));
intersector->setIntersectionLimit (osgUtil::LineSegmentIntersector::NO_LIMIT);
osgUtil::IntersectionVisitor visitor (intersector);
unsigned int mask = interactionMask;
if (ignoreHidden)
mask &= getVisibilityMask();
visitor.setTraversalMask (mask);
mView->getCamera()->accept (visitor);
for (osgUtil::LineSegmentIntersector::Intersections::iterator iter = intersector->getIntersections().begin();
iter!=intersector->getIntersections().end(); ++iter)
{
// reject back-facing polygons
osg::Vec3f normal = osg::Matrix::transform3x3 (
iter->getWorldIntersectNormal(), mView->getCamera()->getViewMatrix());
if (normal.z()>=0)
return iter->getWorldIntersectPoint();
}
osg::Matrixd matrix;
matrix.preMult (mView->getCamera()->getViewport()->computeWindowMatrix());
matrix.preMult (mView->getCamera()->getProjectionMatrix());
matrix.preMult (mView->getCamera()->getViewMatrix());
matrix = osg::Matrixd::inverse (matrix);
osg::Vec3d start = matrix.preMult (intersector->getStart());
osg::Vec3d end = matrix.preMult (intersector->getEnd());
osg::Vec3d direction = end-start;
direction.normalize();
return start + direction * CSMPrefs::get()["Scene Drops"]["distance"].toInt();
}
void CSVRender::WorldspaceWidget::elementSelectionChanged()
{
setVisibilityMask (getVisibilityMask());
flagAsModified();
updateOverlay();
}
unsigned int CSVRender::WorldspaceWidget::getInteractionMask() const
{
return mInteractionMask & getVisibilityMask();
}
