From d230c9c4100516d2e3cad2f0d91b606cc1ceaf89 Mon Sep 17 00:00:00 2001
From: Bruno Postle <bruno@postle.net>
Date: Sun, 1 Mar 2026 17:09:33 +0000
Subject: [PATCH] Fix porch wall lean: replace x_angle with half-space clipping
 (issue #19)

---
 _test_simple.ifc | 58 ++++++++++++++++++++++++++++++------------------
 1 file changed, 36 insertions(+), 22 deletions(-)

diff --git a/_test_simple.ifc b/_test_simple.ifc
index f3d0147..2c79fe2 100644
--- a/_test_simple.ifc
+++ b/_test_simple.ifc
@@ -4198,7 +4198,7 @@ DATA;
 #5022=IFCWALL('1_$aWwKov0Sf7It_vDy_tx',$,'porch south wall',$,$,#5033,#5028,$,$);
 #5023=IFCMATERIALLAYERSETUSAGE(#142,.AXIS2.,.POSITIVE.,0.,$);
 #5024=IFCRELASSOCIATESMATERIAL('2pXAM9FwrFY9lC4Sz49sXz',$,$,$,(#5022),#5023);
-#5028=IFCPRODUCTDEFINITIONSHAPE($,$,(#5353,#5734));
+#5028=IFCPRODUCTDEFINITIONSHAPE($,$,(#5353,#6534));
 #5029=IFCCARTESIANPOINT((2.25000023841858,-1.15582501888275,0.));
 #5030=IFCDIRECTION((0.,0.,1.));
 #5031=IFCDIRECTION((1.,0.,0.));
@@ -4222,7 +4222,7 @@ DATA;
 #5072=IFCWALL('2donwy3Dr5CPaKmOIdQQcb',$,'porch north wall',$,$,#5181,#5078,$,$);
 #5073=IFCMATERIALLAYERSETUSAGE(#142,.AXIS2.,.POSITIVE.,0.,$);
 #5074=IFCRELASSOCIATESMATERIAL('3apSz7di97iBofXEAfmuJI',$,$,$,(#5072),#5073);
-#5078=IFCPRODUCTDEFINITIONSHAPE($,$,(#5366,#5724));
+#5078=IFCPRODUCTDEFINITIONSHAPE($,$,(#5366,#6517));
 #5094=IFCPROPERTYSET('20$m9HA010xfEFnKAwwHBu',$,'EPset_Parametric',$,(#5096));
 #5095=IFCRELDEFINESBYPROPERTIES('1cdFWS8Er9b8kFsrQJ0Aq0',$,$,$,(#5072),#5094);
 #5096=IFCPROPERTYSINGLEVALUE('Engine',$,IFCLABEL('Bonsai.DumbLayer2'),$);
@@ -4490,26 +4490,6 @@ DATA;
 #5712=IFCAXIS2PLACEMENT3D(#5709,#5710,#5711);
 #5713=IFCEXTRUDEDAREASOLID(#5708,#5712,#5707,2.384);
 #5714=IFCSHAPEREPRESENTATION(#11,'Body','SweptSolid',(#5713));
-#5715=IFCCARTESIANPOINTLIST2D(((0.,0.),(0.,0.363216743451473),(1.9,0.363216743451473),(1.9,0.),(0.,0.)));
-#5716=IFCINDEXEDPOLYCURVE(#5715,$,.F.);
-#5717=IFCDIRECTION((0.,0.417779559592008,0.908548424459097));
-#5718=IFCARBITRARYCLOSEDPROFILEDEF(.AREA.,$,#5716);
-#5719=IFCCARTESIANPOINT((0.,0.,0.));
-#5720=IFCDIRECTION((0.,0.,1.));
-#5721=IFCDIRECTION((1.,0.,0.));
-#5722=IFCAXIS2PLACEMENT3D(#5719,#5720,#5721);
-#5723=IFCEXTRUDEDAREASOLID(#5718,#5722,#5717,2.62396580723731);
-#5724=IFCSHAPEREPRESENTATION(#11,'Body','SweptSolid',(#5723));
-#5725=IFCCARTESIANPOINTLIST2D(((0.,0.),(0.,0.363216743451473),(1.9,0.363216743451473),(1.9,0.),(0.,0.)));
-#5726=IFCINDEXEDPOLYCURVE(#5725,$,.F.);
-#5727=IFCDIRECTION((0.,-0.417779559592008,0.908548424459097));
-#5728=IFCARBITRARYCLOSEDPROFILEDEF(.AREA.,$,#5726);
-#5729=IFCCARTESIANPOINT((0.,0.,0.));
-#5730=IFCDIRECTION((0.,0.,1.));
-#5731=IFCDIRECTION((1.,0.,0.));
-#5732=IFCAXIS2PLACEMENT3D(#5729,#5730,#5731);
-#5733=IFCEXTRUDEDAREASOLID(#5728,#5732,#5727,3.58814116258122);
-#5734=IFCSHAPEREPRESENTATION(#11,'Body','SweptSolid',(#5733));
 #5735=IFCPROPERTYSINGLEVALUE('OverallHeight',$,IFCREAL(0.995),$);
 #5736=IFCPROPERTYSINGLEVALUE('OverallWidth',$,IFCREAL(0.625),$);
 #5737=IFCPROPERTYSET('0DJLScEs53MwbL_Z4FP0x2',$,'EPset_Opening',$,(#5735,#5736));
@@ -4900,5 +4880,39 @@ DATA;
 #6464=IFCDIRECTION((1.,0.,0.));
 #6465=IFCAXIS2PLACEMENT3D(#6462,#6463,#6464);
 #6466=IFCLOCALPLACEMENT($,#6465);
+#6501=IFCCARTESIANPOINTLIST2D(((0.,0.),(0.,0.33),(1.9,0.33),(1.9,0.),(0.,0.)));
+#6502=IFCINDEXEDPOLYCURVE(#6501,$,.F.);
+#6503=IFCDIRECTION((0.,0.,1.));
+#6504=IFCARBITRARYCLOSEDPROFILEDEF(.AREA.,$,#6502);
+#6505=IFCCARTESIANPOINT((0.,0.,0.));
+#6506=IFCDIRECTION((0.,0.,1.));
+#6507=IFCDIRECTION((1.,0.,0.));
+#6508=IFCAXIS2PLACEMENT3D(#6505,#6506,#6507);
+#6509=IFCEXTRUDEDAREASOLID(#6504,#6508,#6503,3.5);
+#6510=IFCCARTESIANPOINT((0.,0.,2.384));
+#6511=IFCDIRECTION((0.419,0.,-0.908));
+#6512=IFCDIRECTION((0.,-1.,0.));
+#6513=IFCAXIS2PLACEMENT3D(#6510,#6511,#6512);
+#6514=IFCPLANE(#6513);
+#6515=IFCHALFSPACESOLID(#6514,.F.);
+#6516=IFCBOOLEANCLIPPINGRESULT(.DIFFERENCE.,#6509,#6515);
+#6517=IFCSHAPEREPRESENTATION(#11,'Body','Clipping',(#6516));
+#6518=IFCCARTESIANPOINTLIST2D(((0.,0.),(0.,0.33),(1.9,0.33),(1.9,0.),(0.,0.)));
+#6519=IFCINDEXEDPOLYCURVE(#6518,$,.F.);
+#6520=IFCDIRECTION((0.,0.,1.));
+#6521=IFCARBITRARYCLOSEDPROFILEDEF(.AREA.,$,#6519);
+#6522=IFCCARTESIANPOINT((0.,0.,0.));
+#6523=IFCDIRECTION((0.,0.,1.));
+#6524=IFCDIRECTION((1.,0.,0.));
+#6525=IFCAXIS2PLACEMENT3D(#6522,#6523,#6524);
+#6526=IFCEXTRUDEDAREASOLID(#6521,#6525,#6520,3.5);
+#6527=IFCCARTESIANPOINT((0.,0.,3.26));
+#6528=IFCDIRECTION((-0.419,0.,-0.908));
+#6529=IFCDIRECTION((0.,1.,-0.));
+#6530=IFCAXIS2PLACEMENT3D(#6527,#6528,#6529);
+#6531=IFCPLANE(#6530);
+#6532=IFCHALFSPACESOLID(#6531,.F.);
+#6533=IFCBOOLEANCLIPPINGRESULT(.DIFFERENCE.,#6526,#6532);
+#6534=IFCSHAPEREPRESENTATION(#11,'Body','Clipping',(#6533));
 ENDSEC;
 END-ISO-10303-21;