I pasted below the simple class I wrote to obtain the Display list Id of
the Geometry.
I derive myGeometry from Geometry but the compiler still tells me that I
can not acces the protected member function getGLId() .
Probably there is a bug in the class I wrote.
Thanks for any help
class myGeometry : public Geometry
{
public:
myGeometry(){};
inline int getDListID(GeometryPtr g, PassiveWindowPtr win)
{return win->getGLObjectId(g->getGLId());}
};
Carsten Neumann wrote:
> Hello Sebastian,
>
> Sebastian Knödel wrote:
>
>> Hi there,
>>
>> I would like to access the Display Lists generated by OpenSG.
>> For the moment I use OpenSG only to handle the geometry using the
>> scenegraph infrastructure, but I do the rendering using my own tool.
>> To do so I need the geometry as a display list and as far as I know
>> OpenSG stores the geometry by default in such a list.
>> But I wasn't able to get the Display List Id. There is a member of
>> GeometryBase getGLId() but its protected and I couldn't find a way to
>> acces it even by reimplementing my own Geometry class, which I derived
>> from GeometryBase.
>>
>
> hm, that should actually work. Did you map the id stored in the geometry
> to a real OpenGL id through the Window ?
> The id's stored in geometry and some other places in OpenSG (Textures
> for example) are not real OpenGL ids, they need to be mapped through a
> Window (basically an OpenGL context) to real ids.
>
>
>> My question is:
>> Is there a possibility to access the display lists, created by OpenSG?
>> If yes, how does it work?
>>
>
> The trick with deriving from Geometry should give you access to the id.
> We are reluctant to make this any more accessible as OpenSG assumes it
> can recreate these whenever it feels like it and therefore this can only
> work when you know what is going on in your application (which is true
> for your specific case).
>
> Hope it helps,
> Carsten
>
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