Arch: Added IFC pref option to automatically export IFC objects as Standard Cases when possible

src/Mod/Arch/ArchComponent.py

@@ -678,6 +678,56 @@ class Component:
                     if obj.PerimeterLength.Value != self.flatarea.Faces[0].OuterWire.Length:
                         obj.PerimeterLength = self.flatarea.Faces[0].OuterWire.Length
 
+    def isStandardCase(self,obj):
+
+        # Standard Case has been set manually by the user
+        if obj.IfcType.endswith("Standard Case"):
+            return True
+        # Try to guess
+        import ArchIFC
+        if obj.IfcType + " Standard Case" in ArchIFC.IfcTypes:
+            # this type has a standard case
+            if obj.Additions or obj.Subtractions:
+                return False
+            if obj.Placement.Rotation.Axis.getAngle(FreeCAD.Vector(0,0,1)) > 0.01:
+                # reject rotated objects
+                return False
+            if obj.CloneOf:
+                return obj.CloneOf.Proxy.isStandardCase(obj.CloneOf)
+            if obj.IfcType == "Wall":
+                # rules:
+                # - vertically extruded
+                # - single baseline or no baseline
+                if (not obj.Base) or (len(obj.Base.Shape.Edges) == 1):
+                    if hasattr(obj,"Normal"):
+                        if obj.Normal in [FreeCAD.Vector(0,0,0),FreeCAD.Vector(0,0,1)]:
+                            return True
+            elif obj.IfcType in ["Beam","Column","Slab"]:
+                # rules:
+                # - have a single-wire profile or no profile
+                # - extrusion direction is perpendicular to the profile
+                if obj.Base and (len(obj.Base.Shape.Wires) != 1):
+                    return False
+                if not hasattr(obj,"Normal"):
+                    return False
+                if hasattr(obj,"Tool") and obj.Tool:
+                    return False
+                if obj.Normal == FreeCAD.Vector(0,0,0):
+                    return True
+                elif len(obj.Base.Shape.Wires) == 1:
+                    import DraftGeomUtils
+                    n = DraftGeomUtils.getNormal(obj.Base.Shape)
+                    if n:
+                        if (n.getAngle(obj.Normal) < 0.01) or (abs(n.getAngle(obj.Normal)-3.14159) < 0.01):
+                            return True
+            # TODO: Support windows and doors
+            # rules:
+            # - must have a rectangular shape
+            # - must have a host
+            # - must be parallel to the host plane
+            # - must have an IfcWindowType and IfcRelFillsElement (to be implemented in IFC exporter)
+            return False
+
 
 class ViewProviderComponent:
 

src/Mod/Arch/Resources/ui/preferences-ifc.ui

@@ -501,6 +501,22 @@
         </property>
        </widget>
       </item>
+      <item>
+       <widget class="Gui::PrefCheckBox" name="checkBox_17">
+        <property name="toolTip">
+         <string>Some IFC types such as IfcWall or IfcBeam have special standard versions like IfcWallStandardCase or IfcBeamStandardCase. If this option is turned on, FreeCAD will automatically export such objects as standard cases when the necessary conditions are met.</string>
+        </property>
+        <property name="text">
+         <string>Auto-detet and export as standard cases when applicable</string>
+        </property>
+        <property name="prefEntry" stdset="0">
+         <cstring>getStandardCase</cstring>
+        </property>
+        <property name="prefPath" stdset="0">
+         <cstring>Mod/Arch</cstring>
+        </property>
+       </widget>
+      </item>
      </layout>
     </widget>
    </item>

src/Mod/Arch/importIFC.py

@@ -1568,6 +1568,7 @@ def export(exportList,filename):
         email = s[1].strip(">")
     global template
     template = ifctemplate.replace("$version",version[0]+"."+version[1]+" build "+version[2])
+    getstd = FreeCAD.ParamGet("User parameter:BaseApp/Preferences/Mod/Arch").GetBool("getStandardType",False)
     if hasattr(ifcopenshell,"schema_identifier"):
         schema = ifcopenshell.schema_identifier
     elif hasattr(ifcopenshell,"version") and (float(ifcopenshell.version[:3]) >= 0.6):
@@ -1755,6 +1756,9 @@ def export(exportList,filename):
         # getting the representation
 
         representation,placement,shapetype = getRepresentation(ifcfile,context,obj,forcebrep=(brepflag or FORCE_BREP))
+        if getstd:
+            if isStandardCase(obj,ifctype):
+                ifctype += "StandardCase"
 
         if DEBUG: print(str(count).ljust(3)," : ", ifctype, " (",shapetype,") : ",name)
 
@@ -2378,6 +2382,14 @@ def export(exportList,filename):
     del ifcbin
 
 
+def isStandardCase(obj,ifctype):
+    
+    if ifctype.endswith("StandardCase"):
+        return False # type is already standard case, return False so "StandardCase" is not added twice
+    if hasattr(obj,"Proxy") and hasattr(obj.Proxy,"isStandardCase"):
+        return obj.Proxy.isStandardCase(obj)
+    return False
+
 def getIfcTypeFromObj(obj):
 
     if (Draft.getType(obj) == "BuildingPart") and hasattr(obj,"IfcType") and (obj.IfcType == "Undefined"):