Shadows Panel
) panel can help designate how parts of your model cast their shadows or even see how the sun would cast shadows on or around a geolocated model. It also includes fog settings to add atmospheric depth to your model. 
The Shadows panel helps you control shadows and fog in your model using the following options:
Shadows – Toggles shadows on or off, and adjusts how they are cast:
On face – Casts shadows on other faces.
On ground – Casts shadows on the ground plane.
From edges – Controls whether edges that are not associated with a face cast a shadow
Use sun for shading – When toggled on, SketchUp's simulated sun shades parts of your model even if shadows are toggled off.
Timezone –Allows you to choose a specific time zone.
Time / Date – Sliders allowing you to select a specific time or date.
Light / Dark – Sliders controlling how light illuminated areas appear and how dark shaded or shadowed areas appear.
Fog Settings – Turns fog on or off.
Use Background Color – When toggled on, the fog uses the background color for the model.
Fog Color – Allows you to choose a custom fog color if the Use Background Color option is toggled off.
Distance – Sliders allowing you to adjust fog density and where it begins and ends relative to the camera. Learn more about the sliders in Letting the Fog Roll Into Your Model.
Add location – Opens a tool to help you geolocate your model. For more information, see How to Use Add Location.
For more information on using shadows in your model, see Casting Real-World Shadows.