I have a polygon of a park boundary in ArcMap. It is a single line around the perimeter of the park. When I display that same polygon in ArcScene, it looks the same. However, when I drape that layer on the DEM (using "float layer on a custom surface"), all sorts of extra lines appear in the polygon. I have clipped the screen below to show a) the image straight out of ArcMap with the polygon on a DEM layer,
b) the polygon in ArcScene without adding Base Height information
What is going on with this?