Changeset 3114

Timestamp:

Jun 8, 2006, 12:18:34 PM (19 years ago)

Author:

ole

Message:

Added FAQ about tagging of interior polygons

File:

• documentation/user_manual/anuga_user_manual.tex (modified) (1 diff)

documentation/user_manual/anuga_user_manual.tex

@@ -2643 +2643 @@
 you need a fine mesh over regions where the DEM changes rapidly, and other areas of significant interest, such as the coast.
 
+
+\subsubsection{How do I tag interior polygons?}
+At the moment create_mesh_from_regions does not allow interior polygons 
+with symbolict tags. If tags are needed, the interior polygons must be
+created subsequently. For example, given a filename of polygons representing
+solid walls (in Arc Ungenerate format) can be tagged as such using the code 
+snippet:
+\begin{verbatim} 
+  # Create mesh outline with tags
+  mesh = create_mesh_from_regions(bounding_polygon,
+                                  boundary_tags=boundary_tags)
+  # Add buildings outlines with tags set to 'wall'. This would typically
+  # bind to a Reflective boundary
+  mesh.import_ungenerate_file(buildings_filename, tag='wall')
+
+  # Generate and write mesh to file
+  mesh.generate_mesh(maximum_triangle_area=max_area)                  
+  mesh.export_mesh_file(mesh_filename)
+\end{verbatim} 
+
+Note that a mesh object is returned from \code{create_mesh_from_regions}
+when file name is omitted.
+
 \subsubsection{How often should I store the output?}
 This will depend on what you are trying to answer with your model and how much memory you have available on your machine. If you need