simplify footprints

src/dtcc_builder/__init__.py

@@ -27,7 +27,7 @@
     build_lod1_buildings,
 )
 
-from .building.modify import merge_building_footprints
+from .building.modify import merge_building_footprints, simplify_building_footprints
 
 
 from .geometry_builders.meshes import build_surface_mesh
@@ -46,5 +46,6 @@
     "build_terrain_mesh",
     "build_terrain_raster",
     "flat_terrain",
-    "merge_building_footprints"
+    "merge_building_footprints",
+    "simplify_building_footprints"
 ]

src/dtcc_builder/building/modify.py

@@ -78,3 +78,21 @@ def merge_building_footprints(
         building.add_geometry(building_surface, GeometryType.LOD0)
         merged_buildings.append(building)
     return merged_buildings
+
+def simplify_building_footprints(
+    buildings: List[Building], tolerance: float = 0.5, lod: GeometryType = GeometryType.LOD0
+) -> List[Building]:
+    simplified_buildings = []
+    for building in buildings:
+        lod0 = building.lod0
+        if lod0 is None:
+            continue
+        footprint = lod0.to_polygon()
+        footprint = footprint.simplify(tolerance, True)
+        building_surface = Surface()
+        building_surface.from_polygon(footprint, lod0.zmax)
+        simplified_building = building.copy()
+        simplified_building.add_geometry(building_surface, GeometryType.LOD0)
+        simplified_building.calculate_bounds()
+        simplified_buildings.append(simplified_building)
+    return simplified_buildings