> ## Name

> FogVertexMode - 3D API fog vertex mode

> ## Usage

> FogVertexMode = int(mode)

> ## Valid Enumerants

> mode: None, Exp, Exp2, Linear

> ## Description

> Specify whether to use the fog coordinate or fragment depth as distance value in the fog computation.

> See the GL_FOG_COORDINATE_SOURCE description on the OpenGL glFog manual page for details. See the D3DRS_FOGVERTEXMODE render state description for DirectX 9.

> The standard reset callback sets the FogVertexMode state to int(GL_FRAGMENT_DEPTH_EXT).

> ## Opengl Functionality Requirements

> OpenGL 1.4 or support for extension EXT_fog_coord.

> ## Direct3D Functionality Requirements

> DirectX 9

> ## See Also

> FogColor, FogCoordSrc, FogDensity, FogDistanceMode, FogEnable, FogEnd, FogMode, FogStart, FogTableMode, RangeFogEnable