loops.xml

<svg>
  <defs>
    <g id="cube">
      <polygon points="0 0 0 10 10 5 10 -5" class="d-fill-lightyellow"/>
      <polygon points="10 -5 20 0 20 10 10 5" class="d-fill-silver"/>
      <polygon points="0 10 10 15 20 10 10 5" class="d-fill-lightgrey"/>
    </g>
  </defs>

  <var i="0" cube_wh="20 20"/>
  <loop while="lt($i, 10)">
    <var i="{{$i + 1}}"/>
    <loop count="5" var="j">
      <use href="#cube" wh="$cube_wh" xy="{{$i * 20}} {{$j * 30 + 40}}" />
      <use href="#cube" wh="$cube_wh" xy="{{$i * 20 + 10}} {{$j * 30 + 55}}" />
    </loop>
  </loop>

  <var x="0" oldx="0" oldy="0"/>
  <loop count="100">
    <var y="{{30 * sin($x * 7)}}" x="{{$x + 2}}"/>
    <line xy1="$oldx $oldy" xy2="$x $y" dxy="20 110" class="d-thick d-red"/>
    <var oldx="$x" oldy="$y"/>
  </loop>
</svg>