Mist

4.  Enable GLSL settings
  • Enable Shaders
     
  • Enable Shadows
     
  • Enable Lights
     
  • Enable Color Management
     
  • Enable Ramps
     
  • Enable Nodes
     
  • Enable Extra Textures
Note:
  • GLSL settings appear only when the Render Engine: Blender Game is selected. 
5.  Enable Mist
  • Properties menu >> World button >> Mist tab
     
  • Mist check box
6.  Set Mist Start Distance
  • Properties menu >> World button >> Mist tab
     
  • Start number field >> 10.0
Note:
  • Mist Start is the distance from the active camera that the mist starts
     
  • For this tutorial I'm setting Mist Start to 10.0