If no Terrain Perimeter has been created, shadows fall on an imaginary plane at height of 0", the default height for the first floor.
If a Terrain Perimeter exists, shadows are modified to indicate where the real shadow would fall on the actual terrain.
Multiple Sun Angles can be placed in the same plan. This allows the simultaneous display of shadows cast at different times in floor plan view, however only one will display in camera views.
You can specify different line colors and/or fill styles for shadows cast by multiple Sun Angles in the Sun Angle Specification dialog.