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Author: KStor | Website: http://

The Rotations (con't)

Now we are going to do the buttons:

  • open your first button (say the up-rotation around the x-axis). Enter this
    On (Roll Over)
          Set Variable: "sin" = -  basesin
          Set Variable: "cos" = basecos
          Set Variable: "axis" = "x"
    End On
    On (Release, Roll Out)
          Set Variable: "axis" = "none"
    End On
    The sign of the sine determines which direction the object turns. When you roll over the button, the axis turned around is set to x, and the sin and cos are stored. When you roll out, the axis is set to none. The principle is the same for all the other buttons, but with different values.
  • x-axis down rotation
          Set Variable: "sin" =  basesin
          Set Variable: "cos" = basecos
          Set Variable: "axis" = "x"
  • y-axis right-rotation
          Set Variable: "sin" = - basesin
          Set Variable: "cos" = basecos
          Set Variable: "axis" = "y"
  • y-axis left-rotation
          Set Variable: "sin" = - basesin
          Set Variable: "cos" = basecos
          Set Variable: "axis" = "y"
  • z-axis rotation(1)
          Set Variable: "sin" = - basesin
          Set Variable: "cos" = basecos
          Set Variable: "axis" = "z"
  • z-axis rotation(2)
          Set Variable: "sin" = basesin
          Set Variable: "cos" = basecos
          Set Variable: "axis" = "z"

The last thing we have to do to make our rotation functional is obviously to program the rot frames. This is a simple use of the math-formulas. Open the rotx frame and enter this

Set Variable: "n" = "1"
Loop While (n<=totalpoints)
      Set Variable: "tmp" = (sin * eval("y"&n)) + ( cos * eval("z"&n))
      Set Variable: "y"&n = cos * eval("y"&n) - sin * eval("z"&n)
      Set Variable: "z"&n = tmp
      Set Variable: "n" = n + 1
End Loop
If you check this out it corresponds to the formulas in The Math. Now do the same for the roty frame:
Set Variable: "n" = "1"
Loop While (n<=totalpoints)
      Set Variable: "tmp" = - (sin * eval("x"&n)) + ( cos * eval("z"&n))
      Set Variable: "x"&n = cos * eval("x"&n) + sin * eval("z"&n)
      Set Variable: "z"&n = tmp
      Set Variable: "n" = n + 1
End Loop
and for the rotz frame:
Set Variable: "n" = "1"
Loop While (n<=totalpoints)
      Set Variable: "tmp" = (sin * eval("x"&n)) + ( cos * eval("y"&n))
      Set Variable: "x"&n = cos * eval("x"&n) - sin * eval("y"&n)
      Set Variable: "y"&n = tmp
      Set Variable: "n" = n + 1
End Loop
That's all, your engine is finished!

» Level Advanced

Added: 2000-12-04
Rating: 9 Votes: 2631
(10 being the highest)
» Author
KStor is a student living in France and working with Flash during his free time...that is, not very much.
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