Veritas777, Hmmm. Perhaps that is the case. They probably don't support importing 16-bit, (have you tried copy/paste?), but in any case, I believe they represent a higher resolution for terrains internally than 8-bit, otherwise why would the Diffusive filter work so well? I can blur until I'm fuzzy in the face in Pshop, and still see artifacting. But a few repetitions of Diffusive and things are as smooth as a baby's you-know-what. So, perhaps in some sense, we're both right. I'm very interested in knowing more about the subject..and thanks for the great link to the Poser tutorial(another possible market for altTerrain Builder?). Let me know if you hear anything from Vue on the subject. best, Chipp