[cgma-dev] Inconsistency in getEntities for iGeom interface. Causes problems in iRel.

[Paul Wilson]

Hi Jane,

I think this needs a thorough review!  Patrick and I hunted through 
iGeom_CGMA and found some inconsistencies in a few places.

First, there is an inconsistency between returning pointers to RefEntity 
and pointers to CubitEntity.  This is probably less important, but 
should probably be resolved in any change.

Second, there are places where the geometry is queried for entities of 
dimension=3 (returning RefVolumes) and places where the geometry is 
queried for entities of type=iGeom_REGION (== Body).

This means that 2 calls into the interface that should resolve to the 
same entity may not do so for both reasons.

All of this is related to the fundamental difference between the iGeom 
types (equivalent to vertex, edge, face, volume) and the CGM/ACIS types 
(equiavlent to vertex, edge, face, volume, body).  I think Tim's 
suggestion is the best, but will require some substantial effort.

Paul

On 06/16/2014 10:14 AM, Jane Hu wrote:
> I see in iGeom_CGMA.cc file, function iGeom_get_adjacent_entities, if 
> asks for 3-D refentities, it returns body list. In CGM, bodies are not 
> necessary to be 3-D entities, it may contain single surface or shell. 
> Should we change the return to be only refvolumes which are 3-D 
> entities (I prefer this, makes more sense)? Or I can return both 
> bodies and refvolumes in the returned refentity list. Depending on 
> your user case, I can return one of the two choices.
>
> Jane
>
>
> On Mon, Jun 16, 2014 at 9:32 AM, Jane Hu <janejhu at gmail.com 
> <mailto:janejhu at gmail.com>> wrote:
>
>     Yes, it returns a list of refVolume's which are RefEntities.
>
>     Jane
>
>
>     On Sun, Jun 15, 2014 at 11:55 PM, Patrick Shriwise
>     <shriwise at wisc.edu <mailto:shriwise at wisc.edu>> wrote:
>
>         Hi Jane,
>
>         Will the ref_volumes() method return RefEntities?
>
>         Patrick
>
>         On Jun 15, 2014, at 3:56 PM, Jane Hu <janejhu at gmail.com
>         <mailto:janejhu at gmail.com>> wrote:
>
>>         Look at line 6454, if you have body's pointer, directly call
>>         ref_volumes() will work. It's not an iGeom interface
>>         function, but you can access it in iGeom.
>>
>>         Good luck!
>>
>>         Jane
>>
>>
>>         On Sat, Jun 14, 2014 at 8:55 AM, Patrick Shriwise
>>         <shriwise at wisc.edu <mailto:shriwise at wisc.edu>> wrote:
>>
>>             Hi Jane,
>>
>>             I looked around for this but didn't see it, is there a
>>             specific line/function you were thinking of? Good to know
>>             the ref_volume information is so easy to get to, but it
>>             doesn't seem that its part of the iGeom interface. The
>>             issue being that there's no way to access a body's
>>             volumes via iGeom.
>>
>>             Cheers,
>>
>>             Patrick
>>             On 06/13/2014 11:26 PM, Jane Hu wrote:
>>>
>>>
>>>
>>>
>>>                  Is there a way to get volumes within bodies via iGeom?
>>>
>>>
>>>             See example in  iGeom_CGMA.cc, body->ref_volumes(volumes).
>>>
>>>             Jane
>>>
>>>
>>>                 -- 
>>>                 Patrick C. Shriwise
>>>                 Research Assistant
>>>                 University of Wisconsin - Madison
>>>                 Engineering Research Building - Rm. 428
>>>                 1500 Engineering Drive
>>>                 Madison, WI 53706
>>>                 (608) 446-8173  <tel:%28608%29%20446-8173>
>>>
>>>
>>>
>>>
>>>             -- 
>>>             Jane Hu
>>>
>>>             Asst. Researcher
>>>             Dept. of Engineering Physics
>>>             UW @ Madison
>>>
>>>             "And we know that for those who love God, that is, for
>>>             those who are called according to his purpose, all
>>>             things are working together for good." (Romans 8:28)
>>
>>
>>
>>
>>         -- 
>>         Jane Hu
>>
>>         Asst. Researcher
>>         Dept. of Engineering Physics
>>         UW @ Madison
>>
>>         "And we know that for those who love God, that is, for those
>>         who are called according to his purpose, all things are
>>         working together for good." (Romans 8:28)
>
>
>
>
>     -- 
>     Jane Hu
>
>     Asst. Researcher
>     Dept. of Engineering Physics
>     UW @ Madison
>
>     "And we know that for those who love God, that is, for those who
>     are called according to his purpose, all things are working
>     together for good." (Romans 8:28)
>
>
>
>
> -- 
> Jane Hu
>
> Asst. Researcher
> Dept. of Engineering Physics
> UW @ Madison
>
> "And we know that for those who love God, that is, for those who are 
> called according to his purpose, all things are working together for 
> good." (Romans 8:28)

-- 
-- ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ --
Paul Wilson ~ UW-Madison ~ 608-263-0807 ~ cal: http://bit.ly/pphw-cal
Professor, Engineering Physics. ~ http://cnerg.engr.wisc.edu
Faculty Director, Advanced Computing Infrastructure

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