[osg-users] Gui widgets that expands on more views

[Noè Murr]

Hi Robert,

Thank you for the answer. I like this method:

"One way is to create a Camera (with otho projection) and subgraph to 
render the widgets and assign this Camera to the GraphicsWindow and set 
the Camera's RenderOrder so it get drawn last."

As I have only to draw 2D widgets, can I create a fake camera that does 
not need the scene graph interface where I can draw directly in openGL?

If I can, how should I do that?

Cheers,
     Noè

On 17/08/19 15:36, Robert Osfield wrote:
> HI Noè,
> 
> You can do an overall like this several ways.  One way is to create a 
> Camera (with otho projection) and subgraph to render the widgets and 
> assign this Camera to the GraphicsWindow and set the Camera's 
> RenderOrder so it get drawn last.  Another way is create another View 
> and then have this Camera below that.
> 
> I think the osgsequence and osgtesselate examples illustrates this type 
> of usage case. Do a search for Camera in the examples should illuminate 
> other ways Camera's are used.
> 
> To toggle on/off the widget overall simply set the Camera's NodeMask to 
> 0x0 for switching it off, and back to 0xffffffff (or any non zero should 
> also do) to switch it back on again.
> 
> Robert.