Mist

1.  Render Engine: Blender Game
  •  Info menu >> Engine box >> Blender Game
Note:
  • There are menus that are only available when the Blender Game render engine is selected.
2.  Viewport Shading: Textured
  • 3D View menu >> Viewport Shading box >> Textured
Note:
  • Texture Viewport Shading renders the game objects with the textures you add.
3.  Material Shading: GLSL
  • Properties menu >> Render button >> Shading tab >> GLSL button
Note:
  • Mist also works with Multitexture