Fix crash on invalid faces

[openvmp]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.86%. Comparing base (153ed3f) to head (596087d).
Report is 11 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1541      +/-   ##
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+ Coverage   94.48%   94.86%   +0.38%     
==========================================
  Files          28       28              
  Lines        5780     6228     +448     
  Branches     1071     1262     +191     
==========================================
+ Hits         5461     5908     +447     
  Misses        193      193              
- Partials      126      127       +1     

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[adam-urbanczyk]

@openvmp thanks, what is the background of this fix? How can I reproduce the issue and can a test be added?

[openvmp]

I was trying to use CadQuery to render models for PartCAD.org. Specifically this model: https://partcad.org/repository/assembly/robotics/multimodal/openvmp/robots/don1:robot

It was larger than 1GB back then. And CadQuery was crashing on some triangle. It was too much for me to find which one and why. I stopped using CadQuery for that purpose, so it's impossible to investigate any further now.

[adam-urbanczyk]

Could you share this model as a .brep file?

[openvmp]

Give me some time to add this export feature and to try reproducing the crash (I operate on much smaller models now).

[adam-urbanczyk]

@openvmp I think I found a MRE:

cq.Face.makePlane(1e-9,1e-9).tessellate(1e-3)

[lorenzncode]

BTW, I get an AttributeError (before the fix).

Traceback (most recent call last):
  File "/tmp/test1.py", line 12, in <module>
    verts, _ = Face.makePlane(1e-9, 1e-9).tessellate(1e-3)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/lorenzn/devel/cadquery/cadquery/occ_impl/shapes.py", line 1379, in tessellate
    poly.Node(i).Transformed(Trsf) for i in range(1, poly.NbNodes() + 1)
                                                     ^^^^^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'NbNodes'

I suppose to detect when Faces are skipped one can compare the count in and out of the function.

[adam-urbanczyk]

Yes, me too.

[adam-urbanczyk]

@jmwright are you OK with merging this PR?

[jmwright]

Thanks @openvmp

[jmwright]

@adam-urbanczyk +1 to merge

[adam-urbanczyk]

Thanks @openvmp !