...O.K. - One more post here... After reading what I have posted some people may still not understand this process clearly- so as an exercise- try this: Let's say you are anxious and ready to try and load and render the highly detailed LIDAR image of Mt.Saint Helens noted above. It's a 106MB NED file in BIL format. 1. Open 3DEM. It reads BIL files. Open the downloaded BIL and then SAVE IT as a TER file. 3DEM in this particular case will resample and create the biggest TER file it can, which is 4097x4097. 2.Load this new TER file in Terragen. Follow the 16 bit RAW file export proceedure. 3. Load the exported 16 bit RAW file in Photoshop (or whatever you have that reads 16 bit RAW files. If you don't have software that supports 16 bit files you will need to export it from Terragen as an 8 bit RAW file- and hopefully your app will read that.) 4. In Photoshop do the conversion steps to an RGB file- doing first the conversion to RGB, and then the conversion to 8 bits. This should give you the best re-sample possible. Save the RGB file as a PSD or TGA file. Vue can read either one. (But it will not correctly read a 16 bit Grayscale or RGB TGA or PSD. It WILL READ IT- but not make the best 16 bit to 8 bit data conversion the way Photoshop does.) 5. Create your 4097 x 4097 terrain in Vue and then load in the 4097 x 4097 PSD or TGA at 100% blend. Voila! You have "Instant Hi-Rez Mt. Saint Helens at the highest resolution available to the public" in a Vue MEGA Terrain! Be SURE to save all this before any radical lighting or material effects (like eco-terrains) or you will surely crash Vue immediately. Vue operates much better from a SAVED scene file. One more tip: I have found that a Volumetric atmosphere will immediately crash Vue with a terrain like this. I would stick with something like GI. But Volumetric lights are o.k. from my experience...