For my real-time strategy game Zyrtuul I need to be able to load different landscapes at run-time. A fundamental part of this is loading terrain heightmap data from script. I implemented this last night. I noticed that many people have been asking how to do this online, but I did not see any complete solutions presented. It turned out to be significantly easier than anticipated. This implementation allows you to save your heightmap using any image format (I assume it is saved in Assets/Resources/Heightmaps). Simply attach this script to your terrain object and it will load up the specified heightmap automatically.
