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 Tutorials » 3D
The Rotations This is the last thing we have to do to have our functional 3D engine. The rotation works in a similar way to the zoom. We set two basic basesin and basecos variables. These contain the values of sin 10° and cos 10°. Then while one of the rotation buttons is rolled over the coordinates of all points are rotated around the corresponding axis by 10° at each loop. The rotation frames work with a sin variable and a cos variable, so the zoombuttons only load values in sin and cos and set an axis variable to x, y or z depending on the axis that should be rotated around. First we modify the start frame. After all the rest we first set the basesin and basecos: Set Variable: "basecos" = 0.9848 Set Variable: "basesin" = 0.1736Then we call an initial rotation around the y-axis and the x-axis: Set Variable: "sin" = basesin
Set Variable: "cos" = basecos
Call ("rotx")
Call ("roty")
Now we change the loop frame. Add this: Call ("rot"&axis) This way the rotation is called at every loop.
Notice that if axis=none then there will be no rotation since there is no rotnone frame.
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3D Engine for Dummies
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