For more information about depth map shadows, see Depth map shadows.
         
         To create a depth map shadow
         
         
            - Select the light for which you want to produce a shadow.
-  In the Shadows section of the light’s , turn on .
            
- Select the surface on which you want to cast a shadow.
-  In the  section of the surface’s , turn on .
               Tip 
                        - Set the light’s  in Depth Map Shadow Attributes to the lowest value that produces shadows of acceptable quality. As a starting point, set
                            to the same value as the rendering resolution. If  is too low, shadow edges appear jagged. If  is too high, rendering times increase.
                        
- When batch rendering from the command line, generate shadow depth maps before rendering the scene by using the Render -sp <sceneName> command and option. This can help reduce rendering times and you can reuse the depth maps for subsequent renders.