[MOAB-dev] get_adjacencies of same dim

[Paul Wilson]

(I may have led Patrick astray here in face-to-face conversation...)

Now that I see your reply, Iulian, I think this makes sense.  In 
Patrick's example, there is no reason to actually expect only 3 
responses for all triangles adjacent to another triangle since the 
triangles that share a node are also considered adjacent.

Paul

On 01/27/2014 05:13 PM, Grindeanu, Iulian R. wrote:
> So I think the discussion is about "bridge" entities, for adjacencies; 
> if the bridge entities are nodes, you will get different result 
> compared when bridge entities are edges, so this is why we should keep 
> the current code. (and go through bridge entities, then it is clear 
> what kind of adjacency you want)
>
> Iulian
> ------------------------------------------------------------------------
> *From:* moab-dev-bounces at mcs.anl.gov [moab-dev-bounces at mcs.anl.gov] on 
> behalf of Grindeanu, Iulian R. [iulian at mcs.anl.gov]
> *Sent:* Monday, January 27, 2014 5:10 PM
> *To:* Patrick Shriwise
> *Cc:* moab-dev at mcs.anl.gov
> *Subject:* Re: [MOAB-dev] get_adjacencies of same dim
>
> I think you found something;
> In the code, when the target dimension is the same as source 
> dimension, we return just the entity.
> AEntityFactory.cpp:
> ...
>  599   else if (source_dimension == target_dimension) {
>  600     target_entities.push_back( source_entity );
>  601     result = MB_SUCCESS;
>  602   }
>  603   else {
>
> As a workaround, you probably want to go through edges/vertices, and 
> from edges/vertices get the adjacent triangles.
>
> Tim, should we change the behavior and return all adjacent triangles? 
> I know that there is a discussion in iMesh too about that.
>
> Iulian
> ------------------------------------------------------------------------
> *From:* Patrick Shriwise [shriwise at wisc.edu]
> *Sent:* Monday, January 27, 2014 4:33 PM
> *To:* Grindeanu, Iulian R.
> *Cc:* moab-dev at mcs.anl.gov
> *Subject:* Re: [MOAB-dev] get_adjacencies of same dim
>
> On 01/27/2014 04:24 PM, Grindeanu, Iulian R. wrote:
>> hello,
>> are you using the last parameter / flag to the get_adjacency? By default it is intersect.
>> maybe you want "union" of the input ?
>>
>>   virtual ErrorCode get_adjacencies(const Range &from_entities,
>>                                           const int to_dimension,
>>                                           const bool create_if_missing,
>>                                           Range &adj_entities,
>>                                           const int operation_type = Interface::INTERSECT);
>>
>> What are you getting and you do not expect it?
>> Iulian
>> ________________________________________
>> From:moab-dev-bounces at mcs.anl.gov  [moab-dev-bounces at mcs.anl.gov] on behalf of Patrick Shriwise [shriwise at wisc.edu]
>> Sent: Monday, January 27, 2014 4:08 PM
>> To:moab-dev at mcs.anl.gov
>> Subject: [MOAB-dev] get_adjacencies of same dim
>>
>> Hey all,
>>
>> Quick question. Working on a couple tests for ReadCGM and calling for
>> the adjacencies of an entity which are the same dimension of the entity
>> itself but I'm not getting the result I'm expecting. Any this special to
>> know in this case?
>>
>> Cheers,
>>
>> --
>> Patrick C. Shriwise
>> Research Assistant
>> University of Wisconsin - Madison
>> Engineering Research Building - Rm. 428
>> 1500 Engineering Drive
>> Madison, WI 53706
>> (608) 446-8173
>>
> I'm calling for the adjacencies of a triangle which I would expect to 
> return a vector of entity handles of size 3, but it seems to be 
> returning a vector of size 1.
>
> To be specific I'm using:
>
>
> virtual ErrorCode get_adjacencies(const Range &from_entities,
>                                           const int to_dimension,
>                                           const bool create_if_missing,
>                                           std::vector<EntityHandle> &adj_entities,
>                                           const int operation_type = Interface::INTERSECT);
>
> and here's my call: get_adjacencies( tri, 1, 2, false, adj_tris);
> -- 
> Patrick C. Shriwise
> Research Assistant
> University of Wisconsin - Madison
> Engineering Research Building - Rm. 428
> 1500 Engineering Drive
> Madison, WI 53706
> (608) 446-8173

-- 
-- ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ --
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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