I'm using the Extrusion feature under "feature layer"- "appearance" to extrude points to a specific height based on a value within their attributes. Specifically, I have a range of points representing parking lots and I want to extrude each to a height based on the number of parking spaces. However, when I do this the resulting shape has no "cap" on it. They're essentially 3D pipes with no roof. Is there a setting I'm missing that will cap these "pipes" so they have a surface at the top end?