Package | flash.display |
Class | public final class TriangleCulling |
Inheritance | TriangleCulling Object |
Language Version: | ActionScript 3.0 |
Runtime Versions: | Flash Player 10, AIR 1.5 |
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.
See also
flash.display.GraphicsTrianglePath
Introduction to 3D Vectors
3D Backface Culling
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 |
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.
Fri Mar 19 2010, 02:45 AM -07:00