[osg-users] Adding billboards with different names under the same geometry?

[OpenSceneGraph Users]

Ah, right, now I see it!

Thank you both! It's working now.

On Thursday, May 21, 2020 at 5:48:32 AM UTC-3, OpenSceneGraph Users wrote:
>
> Hi Rodrigo,
>
> from my understanding the number of Billboards, each an individual 
> instance, is not
> the problem in OSG. The cull traversal has to handle it independant of 
> being an individual 
> instance or being a single instance, reused after a transform. So you can 
> create them and give names to them.
> The important point is the resource of the icons. You should load them 
> externally and assign them to the billboards
> by using their pointers. This will ensure OSG will keep only one instance 
> of each kind of icon.
>
> - Werner -
>
> Am 21.05.2020 um 10:11 schrieb OpenSceneGraph Users:
>
> Thank you for your reply, Robert, but one of us is not understanding the 
> other.
>
> "if you are reuse the same subgraph the node above the reused part like 
> the osg::Billboard is what is unique so put your unique name on that"
>
> Actually, I have only one osg::Billboard (geodeHidreletrica) for hundreds 
> of hydroelectric dam icons (thus hundreds of different names). Should I 
> have hundreds of billboards? Hundreds of quads/geometries? I don't quite 
> get how addDrawable copies the icons to different places using (what seems 
> to be) a single osg::Geometry. In which object exactly should I put each 
> different name?
>
> Thanks again,
> Rodrigo.
>
> On Thursday, May 21, 2020 at 3:30:32 AM UTC-3, OpenSceneGraph Users wrote: 
>>
>> If the approach is producing good enough performance then I'd stick with 
>> it.  It's a long way from the most optimal way you could do this type of 
>> task, but all the alternatives are more complicated and require deeper 
>> understanding of OSG/OpenGL/shaders. I'll not attempt to make suggestions 
>> as you should only ever make solutions more complicated if you really have 
>> to.
>>
>> As for giving the objects different names, all objects in the scene graph 
>> support setName/getName, if you are reuse the same subgraph the node above 
>> the reused part like the osg::Billboard is what is unique so put your 
>> unique name on that nodes.  The intersection traversal will return the 
>> whole NodePath to the intersected drawable so you just need to check the 
>> NodePath to find all the associated names.
>>
>> Robert.
>>
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