Loading issues using tessellated geometries

[vernetrenaud]

Hi there, thanks for this nice library!

I have issues loading STEP files generated by Catia under some export settings, especially the "tessellated" mode.

• When using the "exact geometry" export mode of Catia, occtimportjs can read the resulting file without problem, great.
• When using the "tessellated" mode, it fails to load the file : this is my issue.

In the latter case, the error I get from the console is an exception, see attached screenshot.

Looking a bit deeper into this issue, from the STEP file generated with the tessellated mode, I see instructions like :
TESSELLATED_SOLID(...) , TESSELLATED_SHAPE_REPRESENTATION(...) ...
which do not exist in in the "exact geometry" exports.

So I believe that occtimportjs does not support these instructions, do you confirm this ?
Is there any workaround I could use ?

In case you wonder: I have to use the tessellated mode due to several constraints I have, like file size etc. So I don't really have the option to use the other export mode.

Thank you very much for your support, please let me know if you have any idea about this.
Cheers!
renaud

[vernetrenaud]

Update here.

I have tried to open some tessellated STEP files using opencascade python library pythonocc-core 7.8.1, and this works fine.

So my understanding is that those files are supported by opencascade, but not in this JS library.
Do you share this conclusion?

Could it be that occt-import-js is based on an old version of opencascade library, and would need some update?
Thanks for your support!

[kovacsv]

Could you please attach an example file?

[vernetrenaud]

Hi, thanks for replying.
The attached file shows the issue.
example.txt
From what I understand, before OCCT 7.8 (I think) the most recent STEP specification AP242 is not handled properly.
Could it be that you library depends on an old version of OCCT ?
Thanks