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Cutting holes into existing mesh

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Hi everyone,

since some days I am trying to cut polygons (for buildings) out of my mesh. So far, I managed to cut the polygons out but not at the correct height of my mesh.

I am using version 11.2.15.

This is the workflow as I did it so far:

  • Load the dxf-file of the polygons
  • CAD Data --> CAD -> Map
  • Define it as Generic 2D Mesh
  • Feature Objects --> Build Polygons and Renumber
  • Select all Polygons and assign them to disabled via Feature Objects --> Attributes (Mesh type = paving, bias 1, bathymetry type = constant)
  • Convert Map --> 2D Mesh
  • Merge exisiting mesh with polygon-mesh

Every hint is much appreciated!

Thank you,

Maria

Polygons cut.PNG

wrong height.PNG

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The problem is that the polygons defining the buildings have their bathymetry type as "Constant". To fix this you canĀ use whatever topographic data you had used to make the mesh before and interpolate it once more to the mesh. Then assign the interpolated dataset as the "Map Elevation" from the "Data" toolbar.

Another way of doing this is to assign the bathymetry type to use your topographic data instead of being constantĀ for those polygons defining your buildings. I would also suggest that you increase the number of vertices on the arcs defining those polygons, so that the elements around these holes in your mesh are less erratic.

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Hi Jack,

thank you very much for your advice - now it works!

For all others, that is how I did it:

  • convert the dxf-file into scatter data
  • interpolate scatter points onto mesh (scatter -> interpolate to mesh, tick Map Z)
  • convert CAD Data to Map

  • Define it as Generic 2D Mesh
  • Feature Objects --> Build Polygons and Renumber
  • Select all Polygons and assign them to disabled via Feature Objects --> Attributes (Mesh type = paving, bathymetry type = scatter set, material = disable)

  • Convert Map --> 2D Mesh
  • Merge exisiting mesh with polygon-mesh

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