I have a series of .las files with classification code 1 (unassigned) and 2 (ground). I want to create a las dataset but in the 3D view I just see red blocks. What information is missing? It seems to me that there is no spatial reference on the .las files. I did add it but it does not help.
If all you are seeing is the outline or the 'red squares' you mentioned then I would encourage you to look at the % of visibility in the table of contents above your LAS dataset. If it says 0% then I would encourage you to zoom in on it until you start seeing data or adjust the settings. You are correct that the size and the projection are important, but I would pay more attention to the % visibility under the rendering preferences.
