Extracting a named group from a scene graph...

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Andy Mirkis (mandy++at++jupiter.UCSD.EDU)
Mon, 10 Apr 1995 17:56:16 -0700

Has anybody ever tried to extract a portion of a scene graph (say,
all nodes below a named group) and place it under a DCS or SCS?? I've
been working on this for a while with mixed results. Basically,
I remove the group node from the scene graph, traverse its children
down to the geosets and change the vertices so that they are defined
relative to the extracted objects center - the groups bsphere center
(making this the objects origin). Then I move the children under the
new DCS node.

This 'almost' seems to work. I have the object in question spinning
in place and I can only see it during ~90 degrees of its rotation.
Even though the isect traversal masks seem to be set, intersection
(collision and picking) doesn't seem to work.

I also noticed from the scene dump that the vertices have been changed
but the bsphere center for all nodes seem to be the same as before
extraction. I've tried setting them all explicitly using:

                pfNodeBSphere(node, NULL, PFN_BMODE_DYNAMIC);

Is there something I need to do to explicitly change an object's origin?
I know I'm missing something here, I'm just not sure what. Any pointers
or suggestions would be appreciated!

Thanks!
-Andy

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