First of all, I should mention that I have no experience with height or point data at all. I have an Ascii file of lidar data that I want to create 3d terrain from. I tried to import the file into meshlab and also into a CAD program, but the results differed and were not what I expected at all. So I thought I would try ArcGis Pro. I have not been able to work out how to do it. Any advice would be greatly appreciated. The .asc file is here if you'd like to take a look: ShareFile