code: public double get3DArea(){
          if(convertedInput != null) {
              List<DelaunayTriangle> delaunayTriangle = convertedInput.getTriangles();
              double sum = 0;
              for (DelaunayTriangle triangle : delaunayTriangle) {
                  sum += computeTriangleArea3D(triangle);                
              }
              return sum;
          } else {
              return 0;
          }
      }
docs: Return the 3D area of all triangles
  @return