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Displaying extruded area features on a slope without half of the area floating above the surface.

by Technical Evangelist on ‎04-05-2016 06:21 AM - edited on ‎04-06-2016 09:02 AM by Moderator (482 Views)

The default methods for extruding an area feature, such as a building footprint, in a 3D map window will locate the base of the feature directly on the surface approximately one half of the distance of the length of the geometry parallel to the direction of slope.  The resulting appearance of the object will be that open space exists between the surface and the bottom of the extruded geometry.


To obtain the appearence of the extruded feature being tied to the ground, use Style Properties and 3D settings. 

  1. In the 3D Settings tab, turn on the Use relative altitude based on  option under Altitude options
  2. Then enter a value for the Use offset of:  field.  Enter a value that is negative, such as -4 meters. 
  3. To maintain the height of the feature record, you will need to add the offset value back to the extrusion value.  If the extrusion value is an attribute, use a functional attribute expression to add the value to the extrusion attribute.  For example, "StructureHeight + 4".