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.

Variables

@:value(cast "negative")@:enum@:implinlineread onlyNEGATIVE:TriangleCulling = "negative"

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

@:value(cast "none")@:enum@:implinlineread onlyNONE:TriangleCulling = "none"

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

@:value(cast "positive")@:enum@:implinlineread onlyPOSITIVE:TriangleCulling = "positive"

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