I'm trying to accomplish what the attachment JPG image shows as the "inset" shading. I'm using ArcMap 10.3 without 3D Analyst.
I want to ultimately shade a river polygon so it appears as if it's at a lower elevation then the ground. The closest I've come to that is creating a buffer around it using the Buffer wizard (see 3Dwater PDF).
Thanks.
Jared
the reverse of what you want I suspect, unless you can play with the parameters Figure-ground: Drop shadow | ArcGIS Blog