Select
the light for which you want to produce a shadow.
In
the Shadows section of the light’s Attribute Editor,
turn on Use Depth Map Shadows.
Select
the surface on which you want to cast a shadow.
In the Render Stats section
of the surface’s Attribute Editor, turn on Casts Shadows.
Tip
Set
the light’s Resolution in Depth Map Shadow
Attributes to the lowest value that produces shadows of acceptable
quality. As a starting point, set Dmap Resolution to
the same value as the rendering resolution. If Dmap Resolution is
too low, shadow edges appear jagged. If Dmap Resolution 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.