Adding installation via pip to CI tests

.github/workflows/tests.yml

@@ -3,7 +3,7 @@ name: Tests
 on: [push, pull_request]
 
 jobs:
-  tests:
+  tests-with-conda-install:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
@@ -27,3 +27,21 @@ jobs:
         with:
           name: exported-meshes
           path: "*.msh"
+
+  tests-with-pip-install:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Set up Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: 3.11
+      - name: Install system dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y libglu1-mesa
+      - name: Install dependencies
+        run: |
+          python -m pip install .[dev]
+      - name: Run tests
+        run: python -m pytest -v

assembly_mesh_plugin/plugin.py

@@ -1,3 +1,5 @@
+import tempfile
+
 from OCP.TopoDS import TopoDS_Shape
 import cadquery as cq
 import gmsh
@@ -44,7 +46,19 @@ def assembly_to_gmsh(self, mesh_path="tagged_mesh.msh"):
         # All the solids in the current part should be added to the mesh
         for s in obj.moved(loc).Solids():
             # Add the current solid to the mesh
-            gmsh.model.occ.importShapesNativePointer(s.wrapped._address())
+
+            with tempfile.NamedTemporaryFile(suffix=".brep") as temp_file:
+                s.exportBrep(temp_file.name)
+                gmsh.model.occ.importShapes(temp_file.name)
+
+            # TODO find a way to check if the OCC in gmsh is compatible with the
+            # OCC in CadQuery. When pip installed they tend to be incompatible
+            # and this importShapesNativePointer will seg fault. When both
+            # packages are conda installed the importShapesNativePointer works.
+            # Work around that works in both cases is to write a brep and import
+            # it into gmsh. This is slower but works in all cases.
+            # gmsh.model.occ.importShapesNativePointer(s.wrapped._address())
+
             gmsh.model.occ.synchronize()
 
             # All the faces in the current part should be added to the mesh

pyproject.toml

@@ -7,6 +7,7 @@ name = "assembly_mesh_plugin"
 version = "0.1.0"
 dependencies = [
   "cadquery",
+  "gmsh",
 ]
 requires-python = ">=3.9"
 authors = [