To create a raytraced shadow

1. Select the light for which you want to produce a shadow.
2. In the Raytrace Shadow Attributes section of the light’s Attribute Editor, turn on Use Ray Trace Shadows.
3. Select the surface on which you want to cast a shadow.
4. In the Render Stats section of the surface’s Attribute Editor, turn on Casts Shadows.
5. In the Raytracing Quality section of the Render Settings window ( Window > Rendering Editors > Render Settings), turn on Raytracing.
6. Render.