Using a Camera in 3D - Flash 3D: Animation, Interactivity, and Games - page 218

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// set the viewer/camera distance d from the screen
var d:Number = 100;

// set the center of the stage xo, yo as the origin
// of the screen coordinates
var xo:Number = Stage.width/2;
var yo:Number = Stage.height/2;

// set the number of objects to be created
var numberOfObjects:Number = 9;

// create the objects and place them in 3D space
for (var i:Number = 0; i < numberOfObjects; i++)
{
duplicateMovieClip(object_mc,"object"+i,i);
thisObj = this["object"+i];
placeObj(thisObj,i)
}

function placeObj(thisObj,i)
{
// pick a random horizontal location in 3D space
thisObj.x = Math.random()*1200 - 600; //-600 < x < 600
thisObj.y = -150;
thisObj.z = i*50;

}

// display the object on the screen
function displayObj(thisObj)
{
// calculate the distance ratio dr
var dr:Number = d/(d + thisObj.z);

// calculate the screen coordinates xs, ys
var xs:Number = thisObj.x * dr;
var ys:Number = thisObj.y * dr;

// set the location of the object on the Stage
// note minus sign for y is because the y-axis
// in Flash points down instead of up
thisObj._x = xo + xs;
thisObj._y = yo - ys;

// set the size based as a percent of distance ratio
thisObj._xscale = thisObj._yscale = 100 * dr;

// set the object depth based on its z-location so that
// closer objects are on top of farther objects
thisObj.swapDepths(Math.round(-thisObj.z));
}

this.onEnterFrame = function()
{
// loop over all the objects
for (var i:Number = 0; i < numberOfObjects; i++)
{
thisObj = this["object"+i];
displayObj(thisObj);
}
}