Vertical Line of Sight Tool

    Steps for adding a command/tool from a DLL:

1. Register the DLL: LineOfSight.dll.
2. In ArcScene's Customize dialog, click on 'Add from file' and select this sample's dll.
3. Select the Line of Sight tool under the 3D Developer Samples Category on the Commands tab. Drag and drop it to the desired location in the application's user interface. Dismiss the Customize dialog.

    Using the Tool:

1. Place a surface in the scene and select it in the 3D toolbar dropdown.
2. Activate the tool, and on the form that opens optionally set observer and target offsets.
3. Click once on the surface to set the observer position.
4. Click again to set the target position.
5. To better view the resulting graphic you may want to select the 'graphics' layer listed in the 3D Effects toolbar and turn lighting off. Setting some transparency can also be useful.

    Steps for compiling the DLL:

1. The VB code for this sample makes calls to one or more utility modules that are shared by a number of 3D samples. The shared modules are located in the 'Utilities' folder which is found directly below the main '3D Analyst' ArcObjects sample folder. In order to compile the DLL make sure you have the latest version of the shared modules installed.