I am using ArcScene and ran into this problem where I downloaded a couple of neighboring/bordering DEMs(in BIL format), imported them into the scene (as separate entities) and applied Base Heights so it would display in 3D.
The problem is that the DEMs have slightly different shading so they do not join properly (The color/shading does not match up, but the physical height does).
How do I display them all in the same shade/color/symbology?