flash.display.TriangleCulling - Adobe® Flex® 4 Language Reference (Flex 4)

Package	flash.display
Class	public final class TriangleCulling
Inheritance	TriangleCulling Object

Language Version:

ActionScript 3.0

Runtime Versions:

Flash Player 10, AIR 1.5

Defines codes for culling algorithms that determine which triangles not to render when drawing triangle paths.

The terms POSITIVE and NEGATIVE refer to the sign of a triangle's normal along the z-axis. The normal is a 3D vector that is perpendicular to the surface of the triangle.

A triangle whose vertices 0, 1, and 2 are arranged in a clockwise order has a positive normal value. That is, its normal points in a positive z-axis direction, away from the current view point. When the TriangleCulling.POSITIVE algorithm is used, triangles with positive normals are not rendered. Another term for this is backface culling.

A triangle whose vertices are arranged in a counter-clockwise order has a negative normal value. That is, its normal points in a negative z-axis direction, toward the current view point. When the TriangleCulling.NEGATIVE algorithm is used, triangles with negative normals will not be rendered.

Public Properties

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	Property		Defined By
		constructor : Object A reference to the class object or constructor function for a given object instance.	Object
		prototype : Object [static] A reference to the prototype object of a class or function object.	Object

Public Methods

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	Method		Defined By
		hasOwnProperty(name:String):Boolean Indicates whether an object has a specified property defined.	Object
		isPrototypeOf(theClass:Object):Boolean Indicates whether an instance of the Object class is in the prototype chain of the object specified as the parameter.	Object
		propertyIsEnumerable(name:String):Boolean Indicates whether the specified property exists and is enumerable.	Object
		setPropertyIsEnumerable(name:String, isEnum:Boolean = true):void Sets the availability of a dynamic property for loop operations.	Object
		toLocaleString():String Returns the string representation of this object, formatted according to locale-specific conventions.	Object
		toString():String Returns the string representation of the specified object.	Object
		valueOf():Object Returns the primitive value of the specified object.	Object

Public Constants

	Constant		Defined By
		NEGATIVE : String = "negative" [static] Specifies culling of all triangles facing toward the current view point.	TriangleCulling
		NONE : String = "none" [static] Specifies no culling.	TriangleCulling
		POSITIVE : String = "positive" [static] Specifies culling of all triangles facing away from the current view point.	TriangleCulling

Constant Detail

NEGATIVE

Constant

public static const NEGATIVE:String = "negative"

Specifies culling of all triangles facing toward the current view point.

NONE

Constant

public static const NONE:String = "none"

Specifies no culling. All triangles in the path are rendered.

POSITIVE

Constant

public static const POSITIVE:String = "positive"

Specifies culling of all triangles facing away from the current view point. This is also known as backface culling.