I looked around to see if anybody had encountered this problem before but after much searching both here and elsewhere on the Internet I couldn't quite find what I'm experiencing currently. For whatever reason, the shadows in my 3D skybox area are quite odd looking; frequently being blocky or jagged. In addition, the lighting in the 3D skybox seems to be producing odd results with the terrain, making it clear where displacement seams are located. The only thing I can think of that might be causing this is that I don't recall sewing the displacements I was using for the skybox together, but other than that I'm out of ideas. I believe my 3D skybox has everything it requires (including a light_environment), so I'm still not sure what could be causing all this. Any help is appreciated.