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

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X3DPickableObject {
  MFString [in,out] objectType "ALL" ["ALL"|"NONE"|"TERRAIN"|...]
  SFBool   [in,out] pickable   TRUE
}

X3DPickSensorNode : X3DSensorNode {
  MFString [in,out] objectType       "ALL"     ["ALL","NONE","TERRAIN",...]
  SFNode   [in,out] pickingGeometry  NULL      [X3DGeometryNode]
  MFNode   [in,out] pickTarget       []        [X3DGroupingNode|X3DShapeNode|X3DInlineNode]
  MFNode   [out]    pickedGeometry
  SFString []       intersectionType "BOUNDS"  ["GEOMETRY"|"BOUNDS"]
  SFString []       sortOrder        "CLOSEST" ["ANY"|"CLOSEST"|"ALL"|"ALL_SORTED"]
}

LinePickSensor : X3DPickSensorNode {
  MFVec3f  [out]    pickedNormal
  MFVec3f  [out]    pickedPoint
  MFVec3f  [out]    pickedTextureCoordinate
}

PickableGroup : X3DGroupingNode, X3DPickableObject {
  MFString [in,out] objectType     "ALL"    ["ALL","NONE","TERRAIN",...]
  SFBool   [in,out] pickable       TRUE
}

PointPickSensor : X3DPickSensorNode {
  MFVec3f  [out]    pickedPoint
}

PrimitivePickSensor : X3DPickSensorNode {
}

VolumePickSensor : X3DPickSensorNode {
}