Inworld Data

Creating a custom library
nano /opt/opensim/production/bin/inventory/Libraries.xml     nano /opt/opensim/production/bin/assets/AssetSets.xml   
 * Download the blender texture cd (as an example)
 * Prepare your imagefiles. You can use the jp2 batch converter(linux only for now) to batch-process a big texture-library
 * Copy the jp2 files(including directory-structures) into the /opt/opensim/library directory
 * Create the appropriate xml storage files using the Asset Generator script
 * Edit the opensim inventory library reference file
 * Add the inventory reference
 * Edit the opensim assets library reference file
 * Add the asset reference
 * Restart OpenSimulator
 * Check out if the textures are rendered correctly in the viewer
 * More background information (in horrible mailing list form)

Free Assets

 * Free Assets - Free items, textures, heightmaps and scripts.

Terrain

 * Use L3DT to create a custom terrain