Ok i have gone ahead and taken Real world Terrain and imported it into l3dt (which works fine). The only problem is that they have to give the data to me in tiles (meaning i have to import them separately and stitch them together to make the full heigthmap after i have exported them). This means the terrain has varying highest and lowest points in each tile (or heightmap). Therefore when i got to export the heightmaps as images, the value of lets say (Black) could be 650m in one image and 800m in another. This "dominoes" through the rest of the grayscale, meaning that white in one is 1000m and 1150m respectively.
Is there a way to make the height/value of a Grayscale colour the same over more than one heightmap?
Elliott