As of March 19, 2018, it is no longer possible to create or edit terrain, or upload terrain height maps in Sansar. Existing terrain objects (created using the terrain tool or by uploading a height map) will persist until Sansar's April 2018 release, at which time they will be replaced with a placeholder asset.
Terrain generation alternatives
It is still possible to generate terrain as a 3D object and import it to Sansar. Here are some alternative tools to generate terrain objects for your scenes in Sansar.
|Note: The polygon count for a 32mx32m piece of terrain should not exceed 5000 triangles.
Morteza Ahmadi has created a free terrain creation script for Maya. Check out this blog post for more information, or visit the product page to download it for free.
World Machine is a free terrain generation tool that provides powerful tools for generating complex, natural-looking terrain. Check out their website here and download it for free.
Terragen is a tool for building, rendering, and animating realistic natural environments. Check out their features and pricing on their website here.
Jakob Menz has created a set of terrain brushes for use with ZBrush. The brush set is currently available for sale for $15 on his website.