Adding check for splines

.gitignore

@@ -168,7 +168,7 @@ tests_outputs/
 
 # debug output folders
 fuzzySurfaces
-Suspicious_solids/
+suspicious_solids/
 Warning_Solids_definition.txt
 
 .vscode

src/geouned/GEOUNED/core.py

@@ -486,7 +486,7 @@ def load_step_file(
         EnclosureChunk = []
         for step_file in tqdm(step_files, desc="Loading CAD files"):
             logger.info(f"read step file : {step_file}")
-            Meta, Enclosure = Load.load_cad(step_file, self.settings, self.options)
+            Meta, Enclosure = Load.load_cad(step_file, self.settings, self.options, skip_solids)
             MetaChunk.append(Meta)
             EnclosureChunk.append(Enclosure)
         self.meta_list = join_meta_lists(MetaChunk)

src/geouned/GEOUNED/loadfile/load_step.py

@@ -31,7 +31,35 @@ def extract_materials(filename):
     return m_dict
 
 
-def load_cad(filename, settings, options):
+def check_solids_for_splines(solids, filename, skip_solids) -> bool:
+    solid_ids_with_splines = []
+    for i, solid in enumerate(solids):
+        if i not in skip_solids:
+            for edge in solid.Edges:
+                try:
+                    if edge.Curve.__class__.__name__ == "BSplineCurve":
+                        solid_ids_with_splines.append(i)
+                # catching type errors as sometimes edges fail with "TypeError: undefined curve type"
+                except TypeError:
+                    pass
+
+    if solid_ids_with_splines:
+        divider = "', '"
+        no_repetitions = list(set(solid_ids_with_splines))
+        logger.warning(
+            f"The solids {no_repetitions} contain splines in the CAD geometry {filename}\n"
+            "These splines might be used by the CAD geometry so this might not be an issue.\n"
+            "However if spines are used in the geometry then these are not directly convertible to Constructive Solid Geometry (CSG).\n"
+            f"You can use CadToCsg.load_cad(skip_solids=['{divider.join(str(s_id) for s_id in no_repetitions)}']) to exclude this solid from the conversion.\n"
+            "Or you could remove the volume from the CAD file manually.\n"
+            "Or you could replace the splines with polylines or arcs in the CAD file.\n"
+        )
+        return True
+    else:
+        return False
+
+
+def load_cad(filename, settings, options, skip_solids):
 
     # Set document solid tree options when opening CAD differing from version 0.18
     if int(FreeCAD.Version()[1]) > 18:
@@ -53,6 +81,9 @@ def load_cad(filename, settings, options):
     s.read(filename)
     Solids = s.Solids
     meta_list = []
+
+    check_solids_for_splines(Solids, filename, skip_solids)
+
     for i, s in enumerate(Solids):
         meta_list.append(UF.GeounedSolid(i + 1, s))