Fundamentals of 3D Space - Flash 3D: Animation, Interactivity, and Games - page 209

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// set the alpha based as a percent of distance ratio
// thisObj._alpha = 100 * dr;

There you have it. Save your file as 6_8_zSineMotion1.fla and test it. You should see
something similar to Figure 6.36. Piece of cake. Sweet!

Figure 6.36 Completed sinusoidal motion

Step 4: Create a different perspective

It's easy to get variations of the motion that are quite different and with very little
work. For example, let's allow the y - coordinates of the objects to move in the same
way as the z-coordinates but in the opposite direction.

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// put it on the circle
//thisObj.x = xc + r * Math.cos(a);
thisObj.y = yc - r * Math.sin(a);
thisObj.z = zc + r * Math.sin(a);

The objects will be too high when we do this, so we will need to lower the vertical origin
yo of the screen coordinates.