Language Version: | ActionScript 3.0 |
Runtime Versions: | Flash Player 10, AIR 1.5 |
The Orientation3D class is an enumeration of constant values for representing the orientation style
of a Matrix3D object. The three types of orientation are Euler angles, axis angle, and quaternion.
The
decompose
and
recompose
methods of the Matrix3D object take one of these
enumerated types to identify the rotational components of the Matrix.
public static const AXIS_ANGLE:String = "axisAngle"
Language Version: | ActionScript 3.0 |
Runtime Versions: | Flash Player 10, AIR 1.5 |
The axis angle orientation uses a combination of an axis and an angle to determine the orientation.
A line or vector from the center of a three-dimensional globe to the surface is an example of an axis.
The axis around which the object is rotated is a unit vector that represents any possible direction
in the three-dimensional space. The angle represents the magnitude of the rotation
about the vector. The direction determines where a display object is facing and the roll angle determines
which way is up. You can use Vector3D and the Matrix3D objects to determine
the various matrix transformations as well as to determine important three-dimensional programming
values such as the distance to the intersection of two objects that can be used to detect simple
collision between three-dimensional objects.
The Matrix3D.appendRotation()
and Matrix3D.prependRotation()
methods
use the axis angle orientation.
See also
public static const EULER_ANGLES:String = "eulerAngles"
Language Version: | ActionScript 3.0 |
Runtime Versions: | Flash Player 10, AIR 1.5 |
Euler angles, the default orientation for decompose()
and recompose()
methods,
defines the orientation with three separate angles of rotation for each axis. Usually,
a rotation around the x axis is followed by a rotation around the y axis, which is followed by a
rotation around the z axis.
Euler angles can sometimes lead to animation errors because of problems such as singularities when
rotating around the x axis or gimbal lock. For example, since with Euler angles each axis is handled
independently, gimbal lock can occur during the rotation around two or more axes. The axes
can become aligned, leading to unexpected results.
The axis rotation properties of the display object perform Euler angles rotation.
See also
public static const QUATERNION:String = "quaternion"
Language Version: | ActionScript 3.0 |
Runtime Versions: | Flash Player 10, AIR 1.5 |
The quaternion orientation uses complex numbers. An orientation in quaternion is by the three axes of
rotation (x,y,z) and an angle of rotation (w). Quaternion guarantees the shortest, most efficient
path for the rotation. It also produces a smooth, gimbal-lock-free rotation. A gimbal lock can occur
when during the rotation around two or more axes the axes are aligned, leading to unexpected results.
The Matrix3D.interpolate()
method uses quaternion.
See also
© 2009 Adobe Systems Incorporated. All rights reserved.
Wed Jul 29 2009, 04:58 PM -07:00 Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D Orientation3D 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