From: Yair Kurzion (yair++at++polygon.engr.sgi.com)
Date: 01/18/2001 18:50:02
Hello Damin !
Take a look in the Performer Programmer's Guide, it the chapter labeled:
``Programming with C++'' which contains a section on subclassing Performer
objects.
It looks like you want to replace the drawing method on your subclassed node.
Please note (the last page of above chapter) that Performer has a duplicate
copy of each node for the APP, CULL and ISECT processes. When you subclass a
node, only the APP copy of your new node is of the new subclassed type. The
CULL and ISECT copies are of the parent class. So, you can only change a node
behavior in the APP process.
Another note:
Nodes don't exist in the DRAW process. The DRAW process uses a display list
to render pfGeoSets.
-yair
> I am interesting in writing a subclass of pfNode for use in code testing,
> and have some problems/questions that I hope one of you could answer.
>
> 1) The only constructor listed in pfNode.h takes a pointer to a pfBuffer.
> What does this pfBuffer do, and how do I create/aquire one to pass to the
> constructor.
>
> 2) What's the correct way to isolate changes to the rendering state? Is
> the following psuedo-code correct?
>
> pfPushState()
> pfFlushState()
> pfBasicState()
> // my code here.
> pfPopState()
>
> 3) I'm manually creating a bounding sphere using the following code,
> pfSphere bSphere;
> bSphere.center.set(0, 0, 0);
> bSphere.radius = 100;
> setBound(&bSphere, PFBOUND_STATIC);
> Does anything else need to be done/set to prevent the node from getting
> culled?
>
> Thanks,
> Damin Keenan.
>
>
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