Add test and input for simple_sweep_2.ifc; extend constructor for sweep_along_curve to support fixed reference swept area solids

Includes `simple_sweep_2.ifc` test input, geometry validations in `test_sweeps.py`, and a new constructor for `sweep_along_curve` to handle directrix-based sweeps.

src/ifcgeom/mapping/IfcFixedReferenceSweptAreaSolid.cpp

@@ -123,9 +123,7 @@ taxonomy::ptr mapping::map_impl(const IfcSchema::IfcFixedReferenceSweptAreaSolid
         auto sweep = taxonomy::make<taxonomy::sweep_along_curve>(
             matrix, // matrix4::ptr - no transformation needed
             profile, // face::ptr - the profile to sweep
-            nullptr, // item::ptr surface - not used for fixed reference sweep
             dir      // item::ptr curve - the directrix curve
-
         );
 
         // Set the fixed reference direction for the sweep

src/ifcgeom/taxonomy.h

@@ -1217,6 +1217,9 @@ typedef item const* ptr;
 
 				sweep_along_curve(matrix4::ptr m, face::ptr basis, item::ptr surf, item::ptr crv) : sweep(m, basis), surface(surf), curve(crv) {}
 
+			    // New constructor for fixed reference swept area solid
+			    sweep_along_curve(matrix4::ptr m, face::ptr profile, item::ptr directrix) : sweep(m, profile), surface(nullptr), curve(directrix) { }
+
 				virtual size_t calc_hash() const {
 					auto v = std::make_tuple(static_cast<size_t>(SWEEP_ALONG_CURVE), matrix->hash_components(), basis->calc_hash(), surface->calc_hash(), curve->calc_hash());
 					return boost::hash<decltype(v)>{}(v);

test/input_temp/simple_sweep_2.ifc

@@ -0,0 +1,74 @@
+ISO-10303-21;
+HEADER;
+FILE_DESCRIPTION(('ViewDefinition[DesignTransferView]'),'2;1');
+FILE_NAME('/dev/null','2025-08-27T11:12:44+02:00',('AdaUser'),('AdaOrg'),'IfcOpenShell 0.8.2','IfcOpenShell 0.8.2','Nobody');
+FILE_SCHEMA(('IFC4X3_ADD2'));
+ENDSEC;
+DATA;
+#1=IFCPROJECT('0bfgwqvaX7Vvg12DS5E4TH',$,'AdaProject',$,$,$,$,(#11),#6);
+#2=IFCSIUNIT(*,.LENGTHUNIT.,$,.METRE.);
+#3=IFCSIUNIT(*,.AREAUNIT.,$,.SQUARE_METRE.);
+#4=IFCSIUNIT(*,.VOLUMEUNIT.,$,.CUBIC_METRE.);
+#5=IFCSIUNIT(*,.PLANEANGLEUNIT.,$,.RADIAN.);
+#6=IFCUNITASSIGNMENT((#4,#2,#5,#3));
+#7=IFCCARTESIANPOINT((0.,0.,0.));
+#8=IFCDIRECTION((0.,0.,1.));
+#9=IFCDIRECTION((1.,0.,0.));
+#10=IFCAXIS2PLACEMENT3D(#7,#8,#9);
+#11=IFCGEOMETRICREPRESENTATIONCONTEXT($,'Model',3,1.E-05,#10,$);
+#12=IFCGEOMETRICREPRESENTATIONSUBCONTEXT('Body','Model',*,*,*,*,#11,$,.MODEL_VIEW.,$);
+#13=IFCGEOMETRICREPRESENTATIONSUBCONTEXT('Axis','Model',*,*,*,*,#11,$,.GRAPH_VIEW.,$);
+#14=IFCGEOMETRICREPRESENTATIONSUBCONTEXT('Box','Model',*,*,*,*,#11,$,.MODEL_VIEW.,$);
+#15=IFCACTORROLE(.ENGINEER.,$,$);
+#16=IFCPERSON('AdaUser',$,$,$,$,$,(#15),$);
+#17=IFCORGANIZATION('ADA','Assembly For Design and Analysis',$,$,$);
+#18=IFCPERSONANDORGANIZATION(#16,#17,$);
+#19=IFCAPPLICATION(#17,'XXX','ADA','ADA');
+#20=IFCOWNERHISTORY(#18,#19,.READWRITE.,$,$,#18,#19,1756285964);
+#21=IFCDIRECTION((0.,0.,1.));
+#22=IFCDIRECTION((1.,0.,0.));
+#23=IFCCARTESIANPOINT((0.,0.,0.));
+#24=IFCAXIS2PLACEMENT3D(#23,#21,#22);
+#25=IFCLOCALPLACEMENT($,#24);
+#26=IFCSITE('1GDQO$O1L1QOKEaI81COHL',#20,'Ada',$,$,#25,$,$,.ELEMENT.,$,$,$,$,$);
+#27=IFCRELAGGREGATES('34vxVzLRfCB8P7OThopnom',#20,'Project Container',$,#1,(#26));
+#28=IFCPROPERTYSINGLEVALUE('project',$,IFCTEXT('AdaProject'),$);
+#29=IFCPROPERTYSINGLEVALUE('schema',$,IFCTEXT('IFC4X3_add2'),$);
+#30=IFCPROPERTYSET('2hTgvJbh1B7RR4nwsOfRDy',#20,'Properties',$,(#28,#29));
+#31=IFCRELDEFINESBYPROPERTIES('2wzYfhPqT9hwqI5vOO4yex',#20,'Properties',$,(#26),#30);
+#32=IFCMATERIAL('S355',$,'Steel');
+#33=IFCPROPERTYSINGLEVALUE('Grade',$,IFCTEXT('S355'),$);
+#34=IFCPROPERTYSINGLEVALUE('YieldStress',$,IFCPRESSUREMEASURE(355000000.),$);
+#35=IFCPROPERTYSINGLEVALUE('YoungModulus',$,IFCMODULUSOFELASTICITYMEASURE(210000000000.),$);
+#36=IFCPROPERTYSINGLEVALUE('PoissonRatio',$,IFCPOSITIVERATIOMEASURE(0.3),$);
+#37=IFCPROPERTYSINGLEVALUE('ThermalExpansionCoefficient',$,IFCTHERMALEXPANSIONCOEFFICIENTMEASURE(1.2E-05),$);
+#38=IFCPROPERTYSINGLEVALUE('SpecificHeatCapacity',$,IFCSPECIFICHEATCAPACITYMEASURE(0.03),$);
+#39=IFCPROPERTYSINGLEVALUE('MassDensity',$,IFCMASSDENSITYMEASURE(7850.),$);
+#40=IFCMATERIALPROPERTIES('MaterialMechanical','A Material property description',(#33,#34,#35,#36,#37,#38,#39),#32);
+#41=IFCRELASSOCIATESMATERIAL('0vr_O6t$T7vPWIa1EqEt6b',#20,'S355','Objects related to S355',(#64),#32);
+#42=IFCDIRECTION((0.,0.,1.));
+#43=IFCDIRECTION((1.,0.,0.));
+#44=IFCCARTESIANPOINT((0.,0.,0.));
+#45=IFCAXIS2PLACEMENT3D(#44,#42,#43);
+#46=IFCLOCALPLACEMENT(#25,#45);
+#47=IFCCARTESIANPOINTLIST2D(((0.,0.),(0.,0.1),(0.1,0.),(0.1,0.1)),$);
+#48=IFCINDEXEDPOLYCURVE(#47,(IFCLINEINDEX((3,1)),IFCLINEINDEX((1,2)),IFCLINEINDEX((2,4)),IFCLINEINDEX((4,3))),$);
+#49=IFCARBITRARYCLOSEDPROFILEDEF(.AREA.,$,#48);
+#50=IFCCARTESIANPOINTLIST3D(((-100.,-50.,199.610854),(-100.,-50.,200.),(-99.974928791787,-49.9996866104928,199.513897412378),(-99.9060013418686,-49.998825019006,199.441251),(-99.3499585838692,-49.9918744730554,199.093724161494),(-99.2406758662487,-49.9607719931374,198.987781372709),(-99.2000000393918,-49.8803717417563,198.861230109006),(-99.2000000393918,-49.3859696738752,198.235404705615),(-99.1121322022443,-49.2544691526923,198.068948349419),(-98.9000000393918,-49.2000000638752,198.000000135615),(-98.3,-49.1999999172672,197.999999950035)),$);
+#51=IFCINDEXEDPOLYCURVE(#50,(IFCLINEINDEX((2,1)),IFCARCINDEX((1,3,4)),IFCLINEINDEX((4,5)),IFCARCINDEX((5,6,7)),IFCLINEINDEX((7,8)),IFCARCINDEX((8,9,10)),IFCLINEINDEX((10,11))),$);
+#52=IFCDIRECTION((1.,-0.,0.));
+#53=IFCCARTESIANPOINT((0.,0.,0.));
+#54=IFCDIRECTION((0.,0.,-1.));
+#55=IFCDIRECTION((0.,1.,0.));
+#56=IFCAXIS2PLACEMENT3D(#53,#54,#55);
+#57=IFCFIXEDREFERENCESWEPTAREASOLID(#49,#56,#51,$,$,#52);
+#58=IFCSHAPEREPRESENTATION(#12,'Body','AdvancedSweptSolid',(#57));
+#59=IFCPRODUCTDEFINITIONSHAPE($,$,(#58));
+#60=IFCCOLOURRGB('Color1',0.8,0.8,0.8);
+#61=IFCSURFACESTYLESHADING(#60,0.);
+#62=IFCSURFACESTYLE('Color1',.BOTH.,(#61));
+#63=IFCSTYLEDITEM(#57,(#62),'Color1');
+#64=IFCBUILDINGELEMENTPROXY('0pDZhwPyT3dRMnPGA47kAn',#20,'sweep1',$,$,#46,#59,$,$);
+#65=IFCRELCONTAINEDINSPATIALSTRUCTURE('196Q7zPfr4LxqeArD0gmJa',#20,'Physical model',$,(#64),#26);
+ENDSEC;
+END-ISO-10303-21;

test/test_sweeps.py

@@ -204,6 +204,15 @@ def test_simple_sweep_1(test_dir):
     assert occ_shape is not None
     assert ifc_sz == pytest.approx((1.1, 0.1, 0.89578254))
 
+def test_simple_sweep_2(test_dir):
+    ifc_file_path = test_dir / "input_temp/simple_sweep_2.ifc"
+    ifc_mn, ifc_mx, ifc_sz = load_ifc_mesh_bbox(ifc_file_path)
+    occ_shape = load_ifc_occ_shape(ifc_file_path)
+    assert occ_shape is not None
+    assert ifc_sz == pytest.approx((1.800000679914902, 0.9243618756667757, 2.0958492522636902))
+    assert ifc_mn == pytest.approx((-100.1, -50.0, 197.9041507477363))
+    assert ifc_mx == pytest.approx((-98.29999932008509, -49.075638124333224, 200.0))
+
 def test_pipe_12d(test_dir):
     ifc_file_path = test_dir / "input_temp/pipe.ifc"
     ifc_mn, ifc_mx, ifc_sz = load_ifc_mesh_bbox(ifc_file_path)