D3DFOGMODE

The D3DFOGMODE enumerated type contains constants describing the fog mode. These values are used by the D3DRENDERSTATE_FOGTABLEMODE and D3DRENDERSTATE_FOGVERTEXMODE render state in the D3DRENDERSTATETYPE enumerated type.

typedef enum _D3DFOGMODE { 
    D3DFOG_NONE   = 0, 
    D3DFOG_EXP    = 1, 
    D3DFOG_EXP2   = 2, 
    D3DFOG_LINEAR = 3 
    D3DFOG_FORCE_DWORD   = 0x7fffffff, 
} D3DFOGMODE; 

D3DFOG_NONE

No fog effect.

D3DFOG_EXP

The fog effect intensifies exponentially, according to the following formula:

D3DFOG_EXP2

The fog effect intensifies exponentially with the square of the distance, according to the following formula:

D3DFOG_LINEAR

The 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. This value is not used.

Remarks

In monochromatic (ramp) lighting mode, fog works properly only when the fog color is black. (If there is no lighting, any fog color works since, in this case, any fog color is effectively black.)

For more information, see Fog.

Note  Fog can be considered a measure of visibility—the lower the fog value produced by one of the fog equations, the less visible an object is.

Requirements

  Windows NT/2000: Requires Windows NT 4.0 SP3 or later.
  Windows 95/98: Requires Windows 95 or later. Available as a redistributable for Windows 95.
  Version: Requires DirectX 2.0 or later.
  Header: Declared in d3dtypes.h.