http://rendering.ru/ru_en/splineland.html SplineLand is a plugin for Autodesk 3ds Max that helps to generate topographically...
Splines can be topographic contours in one plane each, or can be just any shape. Features
Creation of precise and topologically correct terrains from splines representing topographic contours
Powerful algorithm which allows to control level of details only in areas you need, just by adding or subtracting splines in that...