ACTIONSCRIPT 3 Developer’s Guide en

ACTIONSCRIPT 3.0 DEVELOPER’S GUIDE
Working in three dimensions (3D)
The next figure shows what happens when you set the rotationX property of the container for the squares. This
rotates the squares on the x- axis.
The next figure shows what happens when you increment the rotationZ property of the container of the squares.This
rotates the squares on the z-axis.
A display object can simultaneously move and rotate in 3D space.
Projecting 3D objects onto a 2D view
Flash Player 10 and later, Adobe AIR 1.5 and later
The PerspectiveProjection class in the flash.geom package provides a simple way of applying rudimentary
perspective when moving display objects through 3D space.
If you do not explicitly create a perspective projection for your 3D space, the 3D engine uses a default
PerspectiveProjection object that exists on the root and is propagated to all its children.
The three properties that define how a PerspectiveProjection object displays 3D space are:
fieldOfView
projectionCenter
focalLength
Modifying the value of the fieldOfView automatically modifies the value of the focalLength and vice-versa, since
they are interdependent.
The formula used to calculate the focalLength given the fieldOfView value is:
focalLength = stageWidth/2 * (cos(fieldOfView/2) / sin(fieldOfView/2)
Typically you would modify the fieldOfView property explicitly.
Field of view
Flash Player 10 and later, Adobe AIR 1.5 and later
By manipulating the fieldOfView property of the PerspectiveProjection class, you can make a 3D display object
approaching the viewer appear larger and an object receding from the viewer appear smaller.
Last updated 6/6/2012
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