Hmmm...I used Wilbur in the past but not enough to notice the size limit, I was sure it was 256x256 but I might have been wrong. the beauty of Terragen is that you can load a 4096x4096 terrain from 3DEM...I wish we could have an export to Vue from within 3DEM then it wouldn't be a pain to import dozens of merged DEM's! :) Cheers!