Rhinocommon Transform Method

Core/IFC/IFC L.cs

@@ -286,8 +286,6 @@ namespace GeometryGym.Ifc
 		private IfcObjectPlacement mPlacementRelTo = null;// : OPTIONAL IfcObjectPlacement;
 		private IfcAxis2Placement mRelativePlacement = null;// : IfcAxis2Placement;
 
-		private bool mCalculated = false;
-
 		public IfcObjectPlacement PlacementRelTo
 		{
 			get { return mPlacementRelTo; }
@@ -303,7 +301,7 @@ namespace GeometryGym.Ifc
 		public IfcAxis2Placement RelativePlacement
 		{
 			get { return mRelativePlacement; }
-			set { mRelativePlacement = value; mCalculated = false; }
+			set { mRelativePlacement = value; }
 		}
 
 		internal IfcLocalPlacement() : base() { }

Extensions/RhinoCommon IFC/IFC G RhinoCommon.cs

@@ -49,6 +49,6 @@ namespace GeometryGym.Ifc
 	}
 	public partial class IfcGridPlacement : IfcObjectPlacement
 	{
-		public override Transform Transform { get { return Transform.ChangeBasis(PlacementLocation.LocationPlane, Plane.WorldXY); } }
+		public override Transform Transform() { return Rhino.Geometry.Transform.ChangeBasis(PlacementLocation.LocationPlane, Plane.WorldXY);  }
 	}
 }

Extensions/RhinoCommon IFC/IFC L RhinoCommon.cs

@@ -38,33 +38,32 @@ namespace GeometryGym.Ifc
 	}
 	public partial class IfcLocalPlacement : IfcObjectPlacement
 	{
-		private Transform mtransform = Transform.Unset;
-		public override Transform Transform
+		public override Transform Transform()
 		{
-			get
+			IfcObjectPlacement placementRelTo = PlacementRelTo;
+			IfcAxis2Placement relativePlacement = RelativePlacement;
+			bool identityRelative = relativePlacement == null;
+			if(relativePlacement != null)
 			{
-				if (!mCalculated)
+				if (mDatabase != null && relativePlacement.Plane.IsValid)
 				{
-					mCalculated = true;
-					IfcObjectPlacement placementRelTo = PlacementRelTo;
-					IfcAxis2Placement relativePlacement = RelativePlacement;
-					if (placementRelTo == null || placementRelTo.isXYPlane)
-					{
-						if (relativePlacement == null || relativePlacement.IsXYPlane)
-							mtransform = Transform.Identity;
-						else
-							mtransform = Transform.ChangeBasis(relativePlacement.Plane,Plane.WorldXY);
-					}
-					else
-					{
-						if (relativePlacement == null || relativePlacement.IsXYPlane)
-							mtransform = placementRelTo.Transform;
-						else
-							mtransform = placementRelTo.Transform * Transform.ChangeBasis(relativePlacement.Plane, Plane.WorldXY);
-					}
+					Plane plane = relativePlacement.Plane;
+					if (plane.Origin.DistanceTo(Point3d.Origin) < mDatabase.Tolerance && plane.XAxis.IsParallelTo(Vector3d.XAxis) == 1 && plane.YAxis.IsParallelTo(Vector3d.YAxis) == 1)
+						identityRelative = true;
 				}
-				return mtransform;
+				else
+					identityRelative = relativePlacement.IsXYPlane;
 			}
+			if (placementRelTo == null || placementRelTo.isXYPlane)
+			{
+				if (identityRelative)
+					return Rhino.Geometry.Transform.Identity;
+				else
+					return Rhino.Geometry.Transform.ChangeBasis(relativePlacement.Plane,Plane.WorldXY);
+			}
+			if (identityRelative)
+				return placementRelTo.Transform();
+			return placementRelTo.Transform() * Rhino.Geometry.Transform.ChangeBasis(relativePlacement.Plane, Plane.WorldXY);
 		}
 	} 
 }

Extensions/RhinoCommon IFC/IFC O RhinoCommon.cs

@@ -34,14 +34,14 @@ namespace GeometryGym.Ifc
 			get
 			{
 				Point3d o = new Point3d(), x = new Point3d(1, 0, 0), y = new Point3d(0, 1, 0);
-				Transform tr = Transform;
+				Transform tr = Transform();
 				o.Transform(tr);
 				x.Transform(tr);
 				y.Transform(tr);
 				return new Plane(o, x, y);
 			}
 		}
-		public abstract Transform Transform { get; }
+		public abstract Transform Transform();
 	}
 
 	public partial class IfcOffsetCurve2D : IfcOffsetCurve

Extensions/RhinoCommon IFC/IFC P RhinoCommon.cs

@@ -85,7 +85,9 @@ namespace GeometryGym.Ifc
 			get
 			{
 				IfcObjectPlacement p = ObjectPlacement;
-				return (p == null ? Transform.Identity : p.Transform);
+				if (p == null)
+					return Transform.Identity;
+				return p.Transform();
 			}
 		}
 	}