The next step is to take a snapshot of the base grid with the dam shell integrated into it.  Clear all layers from graphics, and then load the grid with the dam shell merged into it.  Drag the air photo georeference file (PGW) into the 3D window and select the grid when prompted.

You’ll see that the air photo was overlaid correctly, however there is no distinction in the photo to represent where the surface has been modified by the dam shell. 

To fix this, we will use some tools in the Tex module to take the air photo and add a colour or texture in the region of the dam so that it will be visually different from the surrounding topography.

In an earlier step, you saved the dam footprint (the layer footprint created after the dam was merged into the base grid).  You will use this file as the outline within which to shade the air photo a different colour, using the command Tex >> Create >> Append overlay with colours.

Press OK, and two new files will appear in the working directory.  One will be called airphoto+dam.jpg and the other will be airphoto+dam.jgw.

Drag the JGW file into the 3D window, select the grid with the merged dam in it, and the new overlay will be applied.  Now the dam will be visible as a different colour to the rest of the overlay and it is now clear that it is a new feature.

Return to the saved viewpoint (either View >> Viewpoints >> Restore viewpoint, or the dropdown menu on the toolbar) and take a snapshot (View >> Save image or View >> Copy screencap to clipboard).

The final snapshot to take for now is the dam with the pond surface.  Load the pond surface that you saved earlier, return to the saved viewpoint, and take a snapshot.