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usnistgov / STP2X3D

Translator from STEP format to X3D format
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Cannot display GD&T information #7

Closed totaldmis closed 2 years ago

totaldmis commented 2 years ago

I compiled the latest STP2X3D (VS2022+OCC7.6), and tested the file "nist_ctc_01_asme1_ap242.stp". The html generated by the STP2X3D only displays the CAD model, and does not display the corresponding GD&T data. But the strange thing is, using the "STEP File Analyzer and Viewer" can display the correct GD&T information. The attached file is the file I teste. nist_ctc_01_asme1_ap242.zip

How can I solve the problem? Thank you

soonjokwon commented 2 years ago

Hi,

What you need to know is STP2X3D translates and highlights "geometries related to GD&T" such as faces and edges (See the figure below). STP2X3D does not translate the presentation PMIs that you expect which can be obtained by SFA. This is because OCCT does not successfully translate the presentation PMIs at the moment. Once OCCT fully supports it, it may be integrated into STP2X3D. The SFA developer is planning on linking the presentation PMI with relevant geometries for cross-highlighting.

Please test with the latest code that's just been committed.

image

totaldmis commented 2 years ago

Okay, I see. Thank you for your reply

akjay commented 2 years ago

So how to display the GD&T information with SFA?Not familiar with the tcl language.Is the "sfa-geotol.tcl" file to do this thing？ As far as I know, OCC can get some GD&T representation from STEP AP242 file like "nist_ctc_05.stp" download with SFA，but sometimes, when I draw my own step file with Solidworks 2021 and mark some GD&T information,then open with OCC,it can not shown GD&T representation,but SFA can display what I marked in Solidworks.So I wonder how to makes it？Other technology except OCC need to be used to achieve this or OCC commercial component used in SFA project?

soonjokwon commented 2 years ago

@akjay

  1. OCC currently fails to process some STEP entities used to represent GD&T presentations. In other words, as far as I know, different CAD systems use different STEP entities to represent GD&T presentation, and only one of them can be processed by OCC at present. Please refer to the following link regarding the issue you mentioned. Link

  2. SFA does not use OCC for processing GD&T presentations. The developer has written its own code to do it.

akjay commented 2 years ago

@akjay

  1. OCC currently fails to process some STEP entities used to represent GD&T presentations. In other words, as far as I know, different CAD systems use different STEP entities to represent GD&T presentation, and only one of them can be processed by OCC at present. Please refer to the following link regarding the issue you mentioned. Link

  2. SFA does not use OCC for processing GD&T presentations. The developer has written its own code to do it.

OK，learn it.Thank you for reply.By the way ，the part 2 SFA write its own code to do the GD&T presentations process is open source or not？

soonjokwon commented 2 years ago

@akjay Please check the below https://github.com/usnistgov/SFA

akjay commented 2 years ago

@akjay Please check the below https://github.com/usnistgov/SFA

Ok，thank you.