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SassMeister-input-HTML.html

<div class="output"></div>

SassMeister-input.scss

// ----
// Sass (v3.4.9)
// Compass (v1.0.1)
// ----

/****************************************************************
 * SCALE A PATH
 ****************************************************************/
@function scale($path, $scale) {
  @for $n from 1 through length($path) {
    $coords: nth($path, $n);
    
    $path: nth-set($path, $n, (
      nth($coords, 1) * $scale,
      nth($coords, 2) * $scale
    ));
  }
  
  @return $path;
}

/****************************************************************
 * TRANSLATE A PATH
 ****************************************************************/
@function translate($path, $x, $y) {
  @for $n from 1 through length($path) {
    $coords: nth($path, $n);
    
    $path: nth-set($path, $n, (
      nth($coords, 1) + $x,
      nth($coords, 2) + $y
    ));
  }
  
  @return $path;
}

@function render-polygon($polygon, $size) {
  
}

/****************************************************************
 * RENDER THE WHOLE THING
 ****************************************************************/
@mixin render($polygons, $size) {
  $shadows: null;
  
  @each $polygon in $polygons {
    $shadows: join($shadows, render-polygon($polygon, $size), comma);
  }
  
  background-color: transparent;
  box-shadow: $shadows;
  height: 1px;
  width: 1px;
}

/****************************************************************
 * CREATE SHAPES
 ****************************************************************/
$square: (
  (0, 0), (1, 0),
  (1, 1), (0, 1)
);

$triangle: (
  (0.5, 0),
  (1, 1), (0, 1)
);

/****************************************************************
 * CREATE PATHS
 ****************************************************************/
$paths: (
  translate(scale($square, 100), 100, 0),
  scale($triangle, 100)
);

// .output { @include render($paths, (200, 200)); }

SassMeister-output.css

List index is 2 but list is only 1 item long for `nth'

SassMeister-rendered.html

<div class="output"></div>