This simple and short tutorial tries to show you, especially forester, how to create 3D trees from point. Remember, this is a cosmetic tool and for display purpose only.
1. Download the Create_Trees_from_Points_zip extension
2. Install the extension. Just point to the ArcGIS customization to downloaded dll file. If you don’t know how install this extension, just left a message/comment below.
3. Load a point layer which represents tress 2D positions.
4. Run the extensions

5. Fill some parameters.

The form above is the parameter for all trees. No customization for each tree. Again, this tool is for cosmetic/display only.
6. Execute the extension by Clicking on Start.
7. Open ArcScene
8. Load Exported trees file
9. Manage its properties > Set the Base Height into [BASE_HT]
10. Manage its properties > Set the Extrusion into [EXTRUSION]
[BASE_HT] AND [EXTRUSION] are generated from Create Trees from Points extension.
11. See the result

Have fun