False origins can now be explicitly auto, manual, or disabled

src/blenderbim/blenderbim/bim/import_ifc.py

@@ -17,16 +17,12 @@
 # along with BlenderBIM Add-on.  If not, see <http://www.gnu.org/licenses/>.
 
 from __future__ import annotations
-import os
-import re
 import bpy
 import time
 import json
-import bmesh
 import logging
 import mathutils
 import numpy as np
-import numpy.typing as npt
 import multiprocessing
 import ifcopenshell
 import ifcopenshell.geom
@@ -37,8 +33,6 @@ import ifcopenshell.util.placement
 import ifcopenshell.util.representation
 import ifcopenshell.util.shape
 import blenderbim.tool as tool
-import blenderbim.core.spatial
-import ifcopenshell.ifcopenshell_wrapper as ifcopenshell_wrapper
 from itertools import chain, accumulate
 from blenderbim.bim.ifc import IfcStore, IFC_CONNECTED_TYPE
 from blenderbim.tool.loader import OBJECT_DATA_TYPE
@@ -542,19 +536,11 @@ class IfcImporter:
         props = bpy.context.scene.BIMGeoreferenceProperties
         if props.has_blender_offset:
             return
-        if self.ifc_import_settings.false_origin:
+        elif self.ifc_import_settings.false_origin_mode == "DISABLED":
+            return
+        elif self.ifc_import_settings.false_origin_mode == "MANUAL":
             return tool.Loader.set_manual_blender_offset()
-        if self.file.schema == "IFC2X3":
-            project = self.file.by_type("IfcProject")[0]
-        else:
-            project = self.file.by_type("IfcContext")[0]
-        site = tool.Loader.find_decomposed_ifc_class(project, "IfcSite")
-        if site and tool.Loader.is_element_far_away(site):
-            return tool.Loader.guess_false_origin_and_project_north(site)
-        building = tool.Loader.find_decomposed_ifc_class(project, "IfcBuilding")
-        if building and tool.Loader.is_element_far_away(building):
-            return tool.Loader.guess_false_origin_and_project_north(building)
-        return tool.Loader.guess_false_origin_from_elements(self.file)
+        return tool.Loader.guess_false_origin(self.file)
 
     def apply_blender_offset_to_matrix_world(self, obj: bpy.types.Object, matrix: np.ndarray) -> mathutils.Matrix:
         props = bpy.context.scene.BIMGeoreferenceProperties
@@ -1560,6 +1546,7 @@ class IfcImportSettings:
         # Locations greater than 1km are not considered "small sites" according to the georeferencing guide
         # Users can configure this if they have to handle larger sites but beware of surveying precision
         self.distance_limit = 1000
+        self.false_origin_mode = "AUTOMATIC"
         self.false_origin = None
         self.element_offset = 0
         self.element_limit = 30000
@@ -1591,9 +1578,11 @@ class IfcImportSettings:
         settings.angular_tolerance = props.angular_tolerance
         settings.void_limit = props.void_limit
         settings.distance_limit = props.distance_limit
-        settings.false_origin = [float(o) for o in props.false_origin.split(",")] if props.false_origin else None
-        if settings.false_origin == [0, 0, 0]:
-            settings.false_origin = None
+        settings.false_origin_mode = props.false_origin_mode
+        try:
+            settings.false_origin = [float(o) for o in props.false_origin.split(",")[:3]]
+        except:
+            settings.false_origin = [0, 0, 0]
         settings.element_offset = props.element_offset
         settings.element_limit = props.element_limit
         return settings

src/blenderbim/blenderbim/bim/module/project/prop.py

@@ -153,13 +153,22 @@ class BIMProjectProperties(PropertyGroup):
     angular_tolerance: FloatProperty(name="Angular Tolerance", default=0.5)
     void_limit: IntProperty(name="Void Limit", default=30)
     distance_limit: FloatProperty(name="Distance Limit", default=1000, subtype="DISTANCE")
+    false_origin_mode: bpy.props.EnumProperty(
+        items=[
+            (
+                "AUTOMATIC",
+                "Automatic",
+                "An automatic false origin will be detected from geometry with large coordinates",
+            ),
+            ("MANUAL", "Manual", "You can specify the false origin coordinates"),
+            ("DISABLED", "Disabled", "The model in original local coordinates will be shown as is"),
+        ],
+        name="False Origin Mode",
+        default="AUTOMATIC",
+    )
     false_origin: StringProperty(
         name="False Origin",
-        description=(
-            "False origin that will be used to offset the entire model.\n"
-            "(0,0,0) value is interpreted as an unset false origin - false origin will be guessed based on Distance Limit.\n"
-            "False origin is defined in project units"
-        ),
+        description="False origin in project units that the Blender origin will correlate to",
         default="0,0,0",
     )
     element_offset: IntProperty(name="Element Offset", default=0)

src/blenderbim/blenderbim/bim/module/project/ui.py

@@ -145,7 +145,10 @@ class BIM_PT_project(Panel):
         row = self.layout.row()
         row.prop(pprops, "distance_limit")
         row = self.layout.row()
-        row.prop(pprops, "false_origin")
+        row.prop(pprops, "false_origin_mode")
+        if pprops.false_origin_mode == "MANUAL":
+            row = self.layout.row()
+            row.prop(pprops, "false_origin")
 
         row = self.layout.row()
         row.label(text="Element Range")

src/blenderbim/blenderbim/tool/loader.py

@@ -665,3 +665,17 @@ class Loader(blenderbim.core.tool.Loader):
         props.blender_northings = str(offset_point[1])
         props.blender_orthogonal_height = str(offset_point[2])
         props.has_blender_offset = True
+
+    @classmethod
+    def guess_false_origin(cls, ifc_file: ifcopenshell.file) -> None:
+        if ifc_file.schema == "IFC2X3":
+            project = ifc_file.by_type("IfcProject")[0]
+        else:
+            project = ifc_file.by_type("IfcContext")[0]
+        site = cls.find_decomposed_ifc_class(project, "IfcSite")
+        if site and cls.is_element_far_away(site):
+            return cls.guess_false_origin_and_project_north(site)
+        building = cls.find_decomposed_ifc_class(project, "IfcBuilding")
+        if building and cls.is_element_far_away(building):
+            return cls.guess_false_origin_and_project_north(building)
+        return cls.guess_false_origin_from_elements(ifc_file)