3d-analystarcgis-10.0arcgis-desktoparcscene
When I extrude polygons in ArcScene 10.0, the polygon outlines are not displayed regardless of the symbol outline width/color. Thus the extruded edges are not shown. Here's a screenshot showing the problem with USA states. I need to outline each state at the top of it's extrusion.
How do I do this?
Right click on the layer and select Properties, and then navigate to the Symbology tab - like in the image below. Then click on 'Symbol' (located below the Color Ramp) and then 'Properties For All Symbols' where you can change the outline color to 'No Color' for all of the ranges. 
Create a matching polyline layer with an elevation field and populate with values that match the extrusion height. Display the polyline layer with the base height set to "Use a constant elevation offset in scene units" and choose the elevation height field you created that matches the extrusion height of the polygon layer.
This approach will outline the polygons at the correct extrusion height but will not colour the sides of the extruded features. If you extrude both the polygons and the polylines you will probably get rendering errors along the extruded sides since the 2 surface will "compete".
You could try this: use both the polyline and the polygon layer:
Best Answer
As a workaround, you could make a second layer for your polygons and use some base height in order to put your symbolized polygons on top of the extruded polygons.
Alternatively, you can use the Layer 3D To Feature Class geoprocessing tool to convert your extruded buildings to multipatches in a new feature class