We created 3DSOLID, because while working with 3D Solids, we discovered that we repeated the same commands many times, when creating a 3D Solid from an existing polyline. First, create a region with the REGION command, then change the elevation with CHANGE, and finish with EXTRUDE to create the solid. This program gives you a much faster way to do just that.
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First select the objects to use. Objects other than Polylines or Circles are automatically filtered out. The following dialog pops up, where you enter the desired values. Program remembers these values for next use..