How to turn sky on in AutoCAD 2011?

How to turn sky on in AutoCAD 2011, 2012, 2013?

  1. Step 1:

    1. If your sky options are inactive.

  2. Step 2:

    2.You must go on dialog box.

  3. Step 3:

    3. And you must write "perspective" (VERY IMPORTANT: SKY BACKGROUND WORKS ONLY IN PERSPECTIVE MODE!!!).

  4. Step 4:

    4. Then you must choose 1 (1=active, 0=inactive).

  5. Step 5:

    5.The final step, from now are active this option and you cand select "sky off", "sky background" and "sky background and illumination".