Oh, okay RobertJ, I see that the issue has become detached from another thread perhaps in another forum or site. Its not parametric modelling in the purest sense of the word, but you CAN take a texture and use displacement to change a flat plane to highly detailed modelling. Isn't that what Bryce does? Never used it so am not totally sure. This is a valid point well taken since in the link offered by Pog above the artist also used a displacement map for his terrain creation in 3D StudioMax: Lins-Extrude-Poly-MeshSmooth-Displace