/*
  * 3D Environment Visualization System
  *
  * fourD : data interchange format in JavaScript programming language,
  *                where (x,y,z) is the spatial location in solution coordinate system
  *                and fourth dimension represents a multidimensional array.
  *                Designed to extend the data structure to support new attributes.
  * {
  *    index: "000", // String zyx
  *    value: 0.0, // float
  *    color: "0xFFFFFF", // String
  *    opacity: 0.0, // float
  *    enable: 0 // 0 (disable) or 1 (enable)
  * }
  * Example:
  *  fourD[0][0][0].color = "0xFFFFFF";
*/