DirectionalLight

  DirectionalLight { 
      exposedField SFFloat ambientIntensity  0        # [0,1]
      exposedField SFColor color             1 1 1    # [0,1]
      exposedField SFVec3f direction         0 0 -1   # (-,)
      exposedField SFFloat intensity         1        # [0,1]
      exposedField SFBool  on                TRUE 
    }