You can visualize your model with shadows effect, both in preprocess and postprocess mode.
This feature provides a better depth perception of the 3D model and a more realistic rendering.
Change the light direction (View->Render->Change light direction) and see how the shadows move.
This option is available in menu View->Advanced viewing settings.
In the window you can activate the shadows and set several options such as color or quality.
Find more information about this feature in the Reference Manual.