itaps-parallel [Fwd: iMesh_getAdjEntities (yet another proposed iMesh change)]

[Lori A. Diachin]

Here's the second outstanding issue that Jason brought up for 
discussion.  I've also attached the latest iMesh.h and iBase.h to this 
email from the repository - I believe those are up to date with all the 
other changes we've agreed to..

Lori

-------- Original Message --------
Subject: 	iMesh_getAdjEntities (yet another proposed iMesh change)
Date: 	Wed, 04 Feb 2009 11:33:26 -0600
From: 	Jason Kraftcheck <kraftche at cae.wisc.edu>
To: 	TSTT Interface <tstt-interface at mcs.anl.gov>



I think that we should either drop the iMesh_getAdjEntities function
entirely, or if not, then remove the 'offset' argument.  This function
returns entities of the "requested" type, but not the entities of the
"requestor" type/topology.

For the "offset" information to be useful, one must also have the entities
of the "requestor" type/topology in the appropriate order.  Presumably to
get that list the application must call iMesh_getEntities with the implicit
assumption that the order will be correct.  But if the application has the
ordered "requestor" list, then it could just as easily call
iMesh_getEntAdjArr to get the adjacent entities without needing to make any
assumptions about functions returning entities in a consistent order.

The only case where that might be inefficient is if one wanted something
like the list of vertices adjacent to all of the entities in a set but
didn't care about the entities.  But for this use case, presumably the
application would rather have a single list of unique vertex handles and
would have no use for the offset list.

- jason



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