Real Time Shadows

 

7.  Enable Shadows
  • Spotlight Selected

  • Properties menu >> Object Data button

  • Shadow tab >> Shadow checkbox

8.  Only Shadow checkbox 
  • Spotlight Selected

  • Properties menu >> Object Data button

  • Shadow tab >> Only Shadow checkbox

Note:
  • Only Shadow checkbox disabled:  Shadow and light from spotlight

  • Only Shadow checkbox enabled:  Shadow only.  No light from spotlight.

9.  Buffer Shadow Size
  • Spotlight Selected

  • Properties menu >> Object Data button

  • Shadow tab >> Quality: Size

  • Range:  128 to 10240 kilobytes

Note:
  • A large shadow buffer size can overload a video card's frame buffer. 
     
  • If this happens, you won't see any real time shadows.  If you are really unlucky, it will crash Blender 3D.