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TriangleCulling

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

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 will not be 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.

See also

flash.display.Graphics.drawTrianglePath()
flash.display.GraphicsTrianglePath
Introduction to 3D Vectors
3D Backface Culling

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
|  | 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 will be 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.

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Tue May 20 2008, 04:02 AM -07:00