I have been using ArcGIS for some time and am playing around with arcscene for the first time. I am having trouble getting started. When I add a DEM to a blank project it renders as a uniform grey, blank obliqued square. If I use the info tool the values are in the range of valid elevations (ex: ranging from 80 - 2400). Strangely, once I use the info tool on the raster it displays as a uniform red. The same raster works as expected for a DEM in ArcMap. I have only the raster loaded in a blank project. The original Dem is an img format in a gcs coordinate system (downloaded from national map). I have tried reprojecting it and saving it in other formats with no success.