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/usr/src/castle-game-engine-4.1.1/x3d/doc/x3d_nodes/2/EnvironmentalEffects.txt is in castle-game-engine-src 4.1.1-1.

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X3DBackgroundNode : X3DBindableNode { 
  MFFloat [in,out] groundAngle   []      [0,Pi/2]
  MFColor [in,out] groundColor   []      [0,1]
  MFFloat [in,out] skyAngle      []      [0,Pi]
  MFColor [in,out] skyColor      0 0 0   [0,1]
  SFFloat [in,out] transparency  0       [0,1]
}

X3DFogObject {
  SFColor  [in,out] color           1 1 1    [0,1]
  SFString [in,out] fogType         "LINEAR" ["LINEAR"|"EXPONENTIAL"]
  SFFloat  [in,out] visibilityRange 0        [0,-Inf)
}

Background : X3DBackgroundNode {
  MFString [in,out] backUrl      []    [URI]
  MFString [in,out] bottomUrl    []    [URI]
  MFString [in,out] frontUrl     []    [URI]
  MFString [in,out] leftUrl      []    [URI]
  MFString [in,out] rightUrl     []    [URI]
  MFString [in,out] topUrl       []    [URI]
}

Fog : X3DBindableNode, X3DFogObject {
  SFColor  [in,out] color           1 1 1    [0,1]
  SFString [in,out] fogType         "LINEAR" ["LINEAR"|"EXPONENTIAL"]
  SFFloat  [in,out] visibilityRange 0        [0,Inf)
}

FogCoordinate : X3DGeometricPropertyNode {
  MFFloat [in,out] depth    []   [0,1]
}

LocalFog : X3DChildNode, X3DFogObject {
  SFColor  [in,out] color           1 1 1    [0,1]
  SFBool   [in,out] enabled         TRUE
  SFString [in,out] fogType         "LINEAR" ["LINEAR"|"EXPONENTIAL"]
  SFFloat  [in,out] visibilityRange 0        [0,-Inf)
}

TextureBackground : X3DBackgroundNode {
  SFNode  [in,out] backTexture   NULL  [X3DTextureNode]
  SFNode  [in,out] bottomTexture NULL  [X3DTextureNode]
  SFNode  [in,out] frontTexture  NULL  [X3DTextureNode]
  SFNode  [in,out] leftTexture   NULL  [X3DTextureNode]
  SFNode  [in,out] rightTexture  NULL  [X3DTextureNode]
  SFNode  [in,out] topTexture    NULL  [X3DTextureNode]
}