itaps-parallel Questions about iMeshP

[Tim Tautges]

Right, so clearly, some uses for sets have very specific and unique semantics, and some of the functions which take sets 
as arguments won't be allowed.  I think this can be handled at the implementation level, and specialized based on the 
implementation.  If the iMesh functions are used for querying such sets, the implementation is already probably 
specialized for those sets; this just continues that.  There are many examples of such things in both iGeom and iMesh, 
e.g. construction of mesh entities from other mesh entities (iMesh_createEnt).

- tim

Mark Beall wrote:
> In reading things again, there is this bullet above the one I quoted:
> 
> - Many iMesh functions that accept an iBase_EntitySetHandle are also 
> useful in the context of a iMeshP_PartHandle. These functions are 
> reinterpreted so that they can accept either an iBase_EntitySetHandle or 
> an iMeshP_PartHandle.
> What, exactly, does this imply? My concern is that it means that a part 
> has to behave as an entity set for a call like iMesh_addEntSet (which 
> adds an entity set to an existing set). The semantics of an entity set 
> say that, if I make this call, the entity set that I added would have to 
> be returned if I subsequently called iMesh_getEntSets on that part.
> I don't really see how an implementation that doesn't represent parts as 
> entity sets could reasonably be expected to do this.
> If the intention isn't to require the above to work that way, it would 
> seem that it would be better to say that a part is a "read-only" entity 
> set and that there be part-specific functions to add/remove entities 
> to/from a part. It seems to me that this would allow efficient 
> implementations whether or not they are done using entity sets.
> mark
> On Dec 15, 2009, at 4:06 PM, Mark Beall wrote:
> 

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