3ds max – Model a terrain from an Autocad topographical plan file

Software:
3ds max 2019

To model a terrain form an DWG (Autocad) file containing a topographical plan:

  1. Import the DWG file to into the 3ds max scene, and move the plan to the center of the 3ds max scene if necessary.
  2. Select the VIZBlock object and extract its linked geometry:
    Annotation 2019-12-12 181552.jpg
  3. Right click the Linked Geometry object and select:
    Convert To: Editable Spline
    Annotation-2019-12-12-181552b.jpg
  4. Enter Spline editing mode, select all the splines that are not part of the topography, and delete, or detach them so only the terrain ‘height lines’ will remain.
    Annotation 2019-12-12 182223.jpg
    Annotation 2019-12-12 182255.jpg
  5. With the topographical plan editable spline selected,
    Choose Create > Compound Objects > Terrain
    Annotation 2019-12-12 182640.jpg
  6. A Terrain object is now created:
    Annotation 2019-12-12 182716.jpg

To retopologize the terrain mesh to more usable quad polygon mesh:

  1. Create a new Plane primitive above the terrain mesh, slightly smaller at the sides, that has the wanted polygon resolution:
    Annotation 2019-12-12 183519.jpg
  2. From the Top view (important), with the new plane selected, choose:
    Create > Compound Objects > Conform:
    Annotation 2019-12-12 183607.jpg
  3. Set the creation method to ‘Move“, click Pick Wrap-To Object and than click the terrain mesh.
    It will now take some time for the new conformed mesh to be calculated..
    When the new object is ready, right click the viewport to exit the object picking mode.
    Annotation 2019-12-12 184044.jpg
  4. The Conform object is no ready, and contains both the terrain mesh and the new conformed quad polygon mesh:
    Right click it and choose:Convert To: Editable PolyAnnotation 2019-12-12 184552.jpg
  5. In Element editing mode, select the terrain mesh part and delete it to remain only with the new quad polygon mesh:
    Annotation 2019-12-12 184621.jpg
  6. Fix non conformed mesh parts by either moving or deleting them:
    Annotation 2019-12-12 184655Annotation 2019-12-12 184719
  7. The new retopologized terrain is ready:
    Annotation 2019-12-12 184752.jpg

 

The example demonstrated here is a DWG file by Jose Vega, free to download from Bibliocad.com

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