[cgma-dev] cgma-dev Digest, Vol 81, Issue 3

[Andrew Davis]

Hi Evan

My assumption would be that it was converted via Cubit from the equivalent
*.sat file.

Looking at git blame its from Hong-Jun Kim (stp), the sat is from Iulian.

However, the stp is older than the sat by about a year

Andy

On Tue, Aug 25, 2015 at 12:00 PM, <cgma-dev-request at mcs.anl.gov> wrote:

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>    1.  CGM brick orientation test (Vander Zee, Evan B.)
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>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Tue, 25 Aug 2015 16:54:28 +0000
> From: "Vander Zee, Evan B." <vanderzee at anl.gov>
> To: "Jain, Rajeev" <jain at mcs.anl.gov>
> Cc: "cgma-dev at mcs.anl.gov" <cgma-dev at mcs.anl.gov>
> Subject: [cgma-dev] CGM brick orientation test
> Message-ID: <553D5F34658FB846ACEA00D6140EAC6897ADB09F at PAYTON.anl.gov>
> Content-Type: text/plain; charset="us-ascii"
>
> Do you know the source of the file itaps/brick_2.stp in the CGM
> repository?  It looks to me like the edges in the file have improper edge
> orientations.
>
> I have some local changes to CGM that, I thought, fix the face-to-volume
> sense bug.  I am testing the changes in various ways and learning more
> about OCC and CGM.  This version of itaps/brick_2.stp has been used by the
> test_edge_orient test in the itaps directory.  I disabled the test
> previously in my edgeFaceSense branch when I fixed an edge-to-face
> orientation problem.  I am working on rewriting the test now so that it
> properly tests the face-to-volume sense and the edge-to-face sense for both
> OCC and ACIS.
>
> I have the face-to-volume part of the test working fine for OCC now, but
> my revised edge orientation part of the test is failing.  This part of the
> test tests edge orientation after reading the itaps/brick_2.stp file.  When
> I create a 2 x 2 x 2 brick using iGeom_createBrick rather than reading the
> brick from file, my revised edge orientation part of the test passes.  If I
> save that brick to a file, then I can also read the file I've saved, and
> the edge orientation part of the test passes.
>
> I looked at the brick_2.stp file and my human-readable interpretation is
> that the edge orientations are encoded incorrectly.  I think I could
> correct it by hand within the file by changing the orientation of some of
> the oriented edges at entities 106 through 144.  I want to know whether
> it's okay to do that or the STEP file came from some source outside of CGM
> that we need to be able to support.  The brick that CGM writes out after
> iGeom_createBrick is represented quite differently from the way the one in
> itaps/brick_2.stp is represented.
>
> It would help me if I could get a reference for the geometric STEP
> entities.  I have pieced together a few things through Internet searches,
> but I have not been able to find good reference documentation for the parts
> of STEP that are used by CGM.  Do you know of any?
>
> -Evan
> vanderzee at anl.gov
>
>
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> End of cgma-dev Digest, Vol 81, Issue 3
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