D3DRMFOGMODE

Contains values that specify how rapidly and in what ways the fog effect intensifies with increasing distance from the camera.

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

typedef enum _D3DRMFOGMODE{

D3DRMFOG_LINEAR,

D3DRMFOG_EXPONENTIAL,

D3DRMFOG_EXPONENTIALSQUARED

} D3DRMFOGMODE;

Values

D3DRMFOG_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.

D3DRMFOG_EXPONENTIAL

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

D3DRMFOG_EXPONENTIALSQUARED

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

Remarks

Note that 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.

You can specify the fog's density and start and end points by using the IDirect3DRMFrame::SetSceneFogParams method. In the formulas for the exponential fog modes, e is the base of the natural logarithms; its value is approximately 2.71828.

See Also

IDirect3DRMFrame::SetSceneFogMode, IDirect3DRMFrame::SetSceneFogParams