Fog {   SFColor    color             1 1 1    # [0,1]   SFString   fogType           "LINEAR"   SFFloat    visibilityRange   0        # [0,inf) }

The Fog node provides a way to simulate atmospheric effects by blending objects with the color specified by the color field based on the distances of the various objects from the camera. The distances are calculated in the coordinate space of the Fog node. The visibilityRange specifies the distance in meters (in the local coordinate system) at which objects are totally obscured by the fog. Objects located beyond the visibilityRange of the camera are drawn with a constant color of color. Objects very close to the viewer are blended very little with the fog color. A visibilityRange of 0.0 disables the Fog node.

The fogType field controls how much of the fog color is blended with the object as a function of distance. If fogType is "LINEAR", the amount of blending is a linear function of the distance, resulting in a depth cueing effect. If fogType is "EXPONENTIAL", an exponential increase in blending is used, resulting in a more natural fog appearance. If fogType is "EXPONENTIAL2," an square exponential increase in blending is used, resulting in an even more natural fog appearance (see the OpenGL documentation for more details about fog rendering).

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