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.

Formula of fog-effect intensity

D3DFOG_EXP2

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

Formula of fog-effect intensity based on square of distance

D3DFOG_LINEAR

Fog effect intensifies linearly between the start and end points, according to the following formula.

Formula of fog-effect intensity based on start and end points

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

D3D9Types.h

See also

Direct3D Enumerations
D3DRENDERSTATETYPE

 

 

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