write_xyz (CWrp::File8WVR)

    # File ../lib/roller/CWRP.rb, line 510
      def write_xyz(stream)
        cell_size = terrain_cell_size

        reset_progress 'Exporting XYZ', @terrain_height.size

        @terrain_height.each_with_index do |row, y|
          y_value = y * cell_size
          row.each_with_index do |height, x|
            stream.printf("%11.3f %11.3f %11.3f\n",
                (x * cell_size), y_value, height)
          end

          increment_progress
        end

        terrain_grid_size * terrain_grid_size
      end