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

`inlineread onlyNEGATIVE:TriangleCulling = "negative"`

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

`inlineread onlyNONE:TriangleCulling = "none"`

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

`inlineread onlyPOSITIVE:TriangleCulling = "positive"`

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