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  1. Hello, I have a series of 3DFaces provided by the project civil engineer - these elements represent footpaths, roads, cycleways etc. These elements are sloping on various grades as one would expect. I'd like to generate a 3D Polyline that forms a boundary around all the elements that form a section of road or footpath. I can use the 3DPoly tool to visit each external vertex and snap to the vertex but is there a tool or Lisp program that can do this automatically? I've tried the LineworkShrinkWrap command but that doesn't retain all the correct Z values for the external vertices. In the attachment, the layer DESIRED RESULT (magenta) is what I am trying to achieve. Many thanks in advance! 3DPolyTraceQuery.dwg
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