You can now convert from global to local coordinates

src/ifcblenderexport/blenderbim/bim/__init__.py

@@ -169,6 +169,7 @@ if bpy is not None:
         operator.PropagateTextData,
         operator.PushRepresentation,
         operator.ConvertLocalToGlobal,
+        operator.ConvertGlobalToLocal,
         operator.GuessQuantity,
         operator.ExecuteBIMTester,
         operator.BIMTesterPurge,

src/ifcblenderexport/blenderbim/bim/operator.py

@@ -3596,25 +3596,48 @@ class ConvertLocalToGlobal(bpy.types.Operator):
     bl_label = "Convert Local To Global"
 
     def execute(self, context):
-        x, y, z = bpy.context.scene.cursor.location
-
         if bpy.context.scene.MapConversion.scale:
             scale = float(bpy.context.scene.MapConversion.scale)
         else:
             scale = 1.0
-
+        results = ifcopenshell.util.geolocation.xyz2enh(
-        rotation = atan2(
+            bpy.context.scene.cursor.location[0],
-            float(bpy.context.scene.MapConversion.x_axis_ordinate),
+            bpy.context.scene.cursor.location[1],
+            bpy.context.scene.cursor.location[2],
+            float(bpy.context.scene.MapConversion.eastings),
+            float(bpy.context.scene.MapConversion.northings),
+            float(bpy.context.scene.MapConversion.orthogonal_height),
             float(bpy.context.scene.MapConversion.x_axis_abscissa),
+            float(bpy.context.scene.MapConversion.x_axis_ordinate),
+            scale
         )
-        a = scale * cos(rotation)
+        print("Coordinates:", results)
-        b = scale * sin(rotation)
+        bpy.context.scene.cursor.location = results
+        return {"FINISHED"}
 
-        eastings = (a * x) - (b * y) + float(bpy.context.scene.MapConversion.eastings)
-        northings = (b * x) + (a * y) + float(bpy.context.scene.MapConversion.northings)
-        height = z + float(bpy.context.scene.MapConversion.orthogonal_height)
 
-        bpy.context.scene.cursor.location = (eastings, northings, height)
+class ConvertGlobalToLocal(bpy.types.Operator):
+    bl_idname = "bim.convert_global_to_local"
+    bl_label = "Convert Global To Local"
+
+    def execute(self, context):
+        if bpy.context.scene.MapConversion.scale:
+            scale = float(bpy.context.scene.MapConversion.scale)
+        else:
+            scale = 1.0
+        results = ifcopenshell.util.geolocation.enh2xyz(
+            float(bpy.context.scene.BIMProperties.eastings),
+            float(bpy.context.scene.BIMProperties.northings),
+            float(bpy.context.scene.BIMProperties.orthogonal_height),
+            float(bpy.context.scene.MapConversion.eastings),
+            float(bpy.context.scene.MapConversion.northings),
+            float(bpy.context.scene.MapConversion.orthogonal_height),
+            float(bpy.context.scene.MapConversion.x_axis_abscissa),
+            float(bpy.context.scene.MapConversion.x_axis_ordinate),
+            scale
+        )
+        print("Coordinates:", results)
+        bpy.context.scene.cursor.location = results
         return {"FINISHED"}
 
 

src/ifcblenderexport/blenderbim/bim/prop.py

@@ -1473,6 +1473,9 @@ class BIMProperties(PropertyGroup):
     active_clash_set_index: IntProperty(name="Active Clash Set Index")
     constraints: CollectionProperty(name="Constraints", type=Constraint)
     active_constraint_index: IntProperty(name="Active Constraint Index")
+    eastings: StringProperty(name="Eastings")
+    northings: StringProperty(name="Northings")
+    orthogonal_height: StringProperty(name="Orthogonal Height")
     ifc_patch_recipes: EnumProperty(items=getIfcPatchRecipes, name="Recipes")
     ifc_patch_input: StringProperty(default="", name="IFC Patch Input IFC")
     ifc_patch_output: StringProperty(default="", name="IFC Patch Output IFC")

src/ifcblenderexport/blenderbim/bim/ui.py

@@ -839,6 +839,13 @@ class BIM_PT_gis(Panel):
         row = layout.row(align=True)
         row.operator("bim.convert_local_to_global")
 
+        layout.row().prop(scene.BIMProperties, "eastings")
+        layout.row().prop(scene.BIMProperties, "northings")
+        layout.row().prop(scene.BIMProperties, "orthogonal_height")
+
+        row = layout.row(align=True)
+        row.operator("bim.convert_global_to_local")
+
         if hasattr(bpy.context.scene, "sun_pos_properties"):
             row = layout.row(align=True)
             row.operator("bim.get_north_offset")

src/ifcopenshell-python/ifcopenshell/util/geolocation.py

@@ -33,6 +33,18 @@ def xyz2enh(x, y, z, eastings, northings, orthogonal_height, x_axis_abscissa, x_
     return (eastings, northings, height)
 
 
+def enh2xyz(e, n, h, eastings, northings, orthogonal_height, x_axis_abscissa, x_axis_ordinate, scale=None):
+    if scale is None:
+        scale = 1.0
+    rotation = math.atan2(x_axis_ordinate, x_axis_abscissa)
+    a = scale * math.cos(rotation)
+    b = scale * math.sin(rotation)
+    x = ((b * n) - (b * northings) - (a * eastings) + (a * e)) / ((a * a) + (b * b))
+    y = ((a * n) - (a * northings) + (b * eastings) - (b * e)) / ((a * a) + (b * b))
+    z = h - orthogonal_height
+    return (x, y, z)
+
+
 # Used for converting the X and Y vectors of the X Axis in IFC geolocation
 def xy2angle(x, y):
     return math.degrees(math.atan2(y, x))