void EditableSceneBodyImpl::attachPositionDragger(Link* link)
{
    SceneLink* sceneLink = self->sceneLink(link->index());
    double r = sceneLink->untransformedBoundingBox().boundingSphereRadius();
    positionDragger->setRadius(r);
    sceneLink->addChild(positionDragger);
}
void EditableSceneBodyImpl::attachPositionDragger(Link* link)
{
    SceneLink* sceneLink = self->sceneLink(link->index());
    positionDragger->adjustSize(sceneLink->untransformedBoundingBox());
    sceneLink->addChild(positionDragger);
}