I am trying to learn Creating 3D Data Using ArcGIS tutorial created by ESRI. I am having trouble with the Terrain part. I cannot seem to create a Terrain by following the tutorial instructions of R clicking on the dataset -> New and "Terrain" is greyed out. I then created a new dataset & tried to Copy/Paste the feature class into the new dataset, I got an error telling me the fc spatial reference does not match. Anyone else have trouble with the tutorial?