[cgma-dev] Observer question?

[Tim Tautges]

Hi Dave,
   Good hearing from you, when did you leave Sandia?

On the observer question, entities that are not intersected will persist, including the RefEntity's, though whether 
something isn't modified depends on what the engine does (it's keyed off whether the underlying engine changes its 
topological entity).  With Cubit, we've had mostly expected results that way, so no big worries.

If an entity does get deleted due to geometric modification, the observer will get told about it (Cubit uses that 
mechanism internally to do things like clean up meshing scheme data still pointed at stale entities).

- tim

On 07/19/2013 06:34 PM, David Thompson wrote:
> Hi all,
>
> I'm relatively new to CGM and have a question about the entity reference lifecycle. Specifically, what are the circumstances where they become invalid? For instance, are FaceRefs obtained before a webcut valid afterward as long as they did not intersect the sheet used to cut the model?
>
> If not, does the observer mechanism provide enough information for me to obtain a new FaceRef for the same (un-cut) face?
>
> 	Thanks,
> 	David
>
>

-- 
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              Tim Tautges            Argonne National Laboratory
          (tautges at mcs.anl.gov)      (telecommuting from UW-Madison)
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