D3DFOGMODE enumeration
Defines constants that describe the fog mode.
Syntax
typedef enum D3DFOGMODE {
D3DFOG_NONE = 0,
D3DFOG_EXP = 1,
D3DFOG_EXP2 = 2,
D3DFOG_LINEAR = 3,
D3DFOG_FORCE_DWORD = 0x7fffffff
} D3DFOGMODE, *LPD3DFOGMODE;
Constants

D3DFOG_NONE

No fog effect.

D3DFOG_EXP

Fog effect intensifies exponentially, according to the following formula.

D3DFOG_EXP2

Fog effect intensifies exponentially with the square of the distance, according to the following formula.

D3DFOG_LINEAR

Fog effect intensifies linearly between the start and end points, according to the following formula.
This is the only fog mode currently supported.

D3DFOG_FORCE_DWORD

Forces this enumeration to compile to 32 bits in size. Without this value, some compilers would allow this enumeration to compile to a size other than 32 bits. This value is not used.
Remarks
The values in this enumerated type are used by the D3DRS_FOGTABLEMODE and D3DRS_FOGVERTEXMODE render states.
Fog can be considered a measure of visibility: the lower the fog value produced by a fog equation, the less visible an object is.
Requirements
Header 

See also