bool isVisibleFace(int faceIndex, const SbVec2f& pos, Gui::View3DInventorViewer* viewer)
{
SoSeparator* root = new SoSeparator;
root->ref();
root->addChild(viewer->getSoRenderManager()->getCamera());
root->addChild(vp->getRoot());
SoSearchAction searchAction;
searchAction.setType(PartGui::SoBrepFaceSet::getClassTypeId());
searchAction.setInterest(SoSearchAction::FIRST);
searchAction.apply(root);
SoPath* selectionPath = searchAction.getPath();
SoRayPickAction rp(viewer->getSoRenderManager()->getViewportRegion());
rp.setNormalizedPoint(pos);
rp.apply(selectionPath);
root->unref();
SoPickedPoint* pick = rp.getPickedPoint();
if (pick) {
const SoDetail* detail = pick->getDetail();
if (detail && detail->isOfType(SoFaceDetail::getClassTypeId())) {
int index = static_cast<const SoFaceDetail*>(detail)->getPartIndex();
if (faceIndex != index)
return false;
SbVec3f dir = viewer->getViewDirection();
const SbVec3f& nor = pick->getNormal();
if (dir.dot(nor) > 0)
return false; // bottom side points to user
return true;
}
}
return false;
}
