[osg-users] Hiding and Showing a Node with Key Press

[Ross Lance]

All,

 

I am trying to setup a keyboard event to toggle a particular node on and off. I am not sure if I should use osg::Switch node or node masks? Any suggestions or examples you could point me to?

 

Thanks,

Ross

[Ralf Stokholm]

node()->setNodeMask(visible ? ~0 : 0);

should do it

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[Judson Weissert]

If you associate a node mask to each type of node that may need to be
hidden using setNodeMask(), you can then modify the cull mask of the
camera to show/hide the nodes accordingly.

osg::Camera::setCullMask (mask) - would be called when the keyboard
button is pressed.
osg::Node::setNodeMask (mask) - would be called when creating the
original scene graph.

If you use osg::SwitchNode, it would be a slightly different process,
but similar.

- Judson

[Ross Lance]

Thanks that did the trick. Just for other's reference this is what worked well for me using setNodeMask():

 

// Keyboard Event Handler to Show/Hide Node
class HideQuadKeyboardEventHandler : public osgGA::GUIEventHandler
{
    public:
        HideQuadKeyboardEventHandler(osg::Node* node) { _node = node; visible = true; }
        virtual bool handle(const osgGA::GUIEventAdapter& ea,osgGA::GUIActionAdapter&);
        virtual void accept(osgGA::GUIEventHandlerVisitor& v)   { v.visit(*this); };
    private:
        bool visible;
        osg::Node* _node;
};

 

bool HideQuadKeyboardEventHandler::handle(const osgGA::GUIEventAdapter& ea,osgGA::GUIActionAdapter& aa)
{
    switch(ea.getEventType())
    {
        case(osgGA::GUIEventAdapter::KEYDOWN):
        {
            switch(ea.getKey())
            {
                // Toggle Node on and Off
                case 'x':
                {
                    if(_node)
                    {
                        visible = !visible;
                        _node->setNodeMask(visible ? 0xffffffff : 0x0);
                    }
                    return false;
                }
                break;
                default:
                    return false;
            }
        }
        default:
        return false;
   }
}