Added mesh simplification.

.github/workflows/checks.yml

@@ -20,7 +20,7 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
-          pip install mypy pylint opencv-python "osmnx<2.0.0" geopy trimesh rasterio tqdm types-tqdm pandas-stubs types-requests pytest pytest-cov
+          pip install mypy pylint opencv-python "osmnx<2.0.0" "fast-simplification" geopy trimesh rasterio tqdm types-tqdm pandas-stubs types-requests pytest pytest-cov
 
       - name: Run mypy to generate cache
         run: mypy maps4fs || true

Dockerfile

@@ -10,7 +10,7 @@ WORKDIR /usr/src/app
 COPY data /usr/src/app/data
 COPY webui /usr/src/app/webui
 
-RUN pip install "opencv-python" "pyproj" "folium" "geopy" "osmnx<2.0.0" "rasterio" "trimesh" "tqdm" "streamlit" "maps4fs"
+RUN pip install "opencv-python" "pyproj" "folium" "geopy" "osmnx<2.0.0" "fast-simplification" "rasterio" "trimesh" "tqdm" "streamlit" "maps4fs"
 
 EXPOSE 8501
 

dev/requirements.txt

@@ -12,4 +12,5 @@ pytest
 pytest-cov
 folium
 geopy
+fast-simplification
 pyproj

maps4fs/generator/background.py

@@ -51,7 +51,7 @@ def preprocess(self) -> None:
                 tile_code=path_step.code,
                 auto_process=False,
                 blur_radius=self.kwargs.get("blur_radius"),
-                multiplier=300,
+                multiplier=1,
             )
 
             # Update the origin for the next tile.
@@ -168,6 +168,11 @@ def plane_from_np(self, dem_data: np.ndarray, save_path: str) -> None:
 
         faces = np.array(faces)  # type: ignore
         mesh = trimesh.Trimesh(vertices=vertices, faces=faces)
+
+        # Simplify the mesh to reduce the number of faces.
+        mesh = mesh.simplify_quadric_decimation(face_count=len(faces) // 10)
+        self.logger.debug("Mesh simplified to %s faces", len(mesh.faces))
+
         mesh.export(save_path)
         self.logger.info("Obj file saved: %s", save_path)
 

requirements.txt

@@ -7,4 +7,5 @@ folium
 geopy
 trimesh
 pyproj
+fast-simplification
 maps4fs