Armadillo projection with New Zealand

Armadillo projection with New Zealand, made to illustrate this question by Thomas Ansart.

It's a composed projection, but simpler, since New Zealand is at the margin and outside the main map. Check the variables ended with NZ to see the strange things.

<!DOCTYPE html>
<meta charset="utf-8">
<style>

body {
  background: #fcfcfa;
}

.stroke {
  fill: none;
  stroke: #000;
  stroke-width: 3px;
}

.fill {
  fill: #e5e6e1;
}
.boundaryNZ {
  fill: #e5e6e1;
  stroke: #000;
  stroke-width: 1px;
}

.graticule {
  fill: none;
  stroke: #777;
  stroke-width: .5px;
  stroke-opacity: .5;
}

.land {
  fill: #f9fdfc;
  stroke: #444;
}

.boundary {
  fill: none;
  stroke: #444;
  stroke-width: .5px;
}

</style>
<body>
<script src="//d3js.org/d3.v5.min.js"></script>
<script src="https://d3js.org/d3-geo-projection.v2.min.js"></script>
<script src="//d3js.org/topojson.v1.min.js"></script>
<script>

var width = 960,
    height = 560;

var projection = d3.geoArmadillo()
    .scale(237)
    .translate([width / 2, height/2])
    .parallel(20)
    .rotate([-10, 0])
    .precision(.1);

var path = d3.geoPath()
    .projection(projection);

var projectionNZ = d3.geoArmadillo()
    .scale(300)
    .translate([120 + (width / 2), -140 + height/2])
    .parallel(20)
    .rotate([-100, 0])
    .precision(.1);

var pathNZ = d3.geoPath()
    .projection(projectionNZ);

var graticule = d3.geoGraticule();
var graticuleNZ = d3.geoGraticule().extent([[160, -50], [179, -30]]);

var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height);

var defs = svg.append("defs");

defs.append("path")
    .datum({type: "Sphere"})
    .attr("id", "sphere")
    .attr("d", path);

defs.append("clipPath")
    .attr("id", "clip")
  .append("use")
    .attr("xlink:href", "#sphere");

svg.append("use")
    .attr("class", "stroke")
    .attr("xlink:href", "#sphere");

svg.append("use")
    .attr("class", "fill")
    .attr("xlink:href", "#sphere");

svg.append("path")
    .datum({type: "Polygon", "coordinates": [[[165, -50], [165, -30], [179, -30], [179, -50],[165, -50]]]})
    .attr("class", "boundaryNZ")
    .attr("d", pathNZ);

svg.append("path")
    .datum(graticule)
    .attr("class", "graticule")
    .attr("clip-path", "url(#clip)")
    .attr("d", path);

svg.append("path")
    .datum(graticuleNZ)
    .attr("class", "graticule")
    .attr("d", pathNZ);

d3.json("world-50m.json").then(function(world){

var land = topojson.feature(world, world.objects.land);
  var stream = d3.geoClipRectangle(166.509144322, -46.641235447, 178.517093541, -34.4506617165);
  var landNZ = d3.geoProject(land, {stream});

svg.insert("path", ".graticule")
      .datum(landNZ)
      .attr("class", "land")
      .attr("d", pathNZ);
  
  svg.insert("path", ".graticule")
      .datum(land)
      .attr("class", "land")
      .attr("clip-path", "url(#clip)")
      .attr("d", path);

svg.insert("path", ".graticule")
      .datum(topojson.mesh(world, world.objects.countries, function(a, b) { return a !== b; }))
      .attr("class", "boundary")
      .attr("clip-path", "url(#clip)")
      .attr("d", path);
});

d3.select(self.frameElement).style("height", height + "px");

</script>

https://d3js.org/d3.v5.min.js

https://d3js.org/d3-geo-projection.v2.min.js

https://d3js.org/topojson.v1.min.js