Vanishing Earth

Playing with clipAngle(x -> 0).

<!DOCTYPE html>
<meta charset="utf-8">
<body>
<script src="//d3js.org/d3.v4.min.js"></script>
<script src="//d3js.org/topojson.v1.min.js"></script>
<script>

var width = 960,
    height = 500;

var radius = height / 2 - 20,
    scale = radius,
    velocity = .015;

var projection = d3.geoOrthographic()
    .translate([width / 2, height / 2])
    .scale(scale)
    .clipAngle(170);

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

var context = canvas.node().getContext("2d");

// retina display
  var devicePixelRatio = window.devicePixelRatio || 1;
  canvas.style('width', canvas.attr('width')+'px');
  canvas.style('height', canvas.attr('height')+'px');
  canvas.attr('width', canvas.attr('width') * devicePixelRatio);
  canvas.attr('height', canvas.attr('height') * devicePixelRatio);
  context.scale(devicePixelRatio,devicePixelRatio);

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

d3.json("https://gist.githubusercontent.com/mbostock/4090846/raw/d534aba169207548a8a3d670c9c2cc719ff05c47/world-110m.json", function(error, world) {
  if (error) throw error;

var land = topojson.feature(world, world.objects.land);

d3.timer(function(elapsed) {
    context.clearRect(0, 0, width, height);

projection.rotate([velocity * elapsed, 0]);
    projection.clipAngle(Math.cos(0.05 * velocity * elapsed) * 45 + 45);
    context.beginPath();
    path(land);
    context.lineWidth = 1;
    context.strokeStyle = 'black';
    context.stroke();
    context.fillStyle = '#eee';
    context.fill();

context.beginPath();
    path({type: "Sphere"});
    context.lineWidth = 1.5;
    context.strokeStyle = 'black';
    context.stroke();
  });
});

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

</script>

https://d3js.org/d3.v4.min.js

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