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Back-facing Hemisphere
license: gpl-3.0

Testing a prototype new graphics pipeline for d3.geo. The red lines are the front hemisphere, while the gray lines are the back hemisphere. Back-hemisphere clipping is achieved by first clipping around the antipode of the front hemisphere, and then applying an additional rotation.

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var renderBack = d3.geo.pipeline()
.source(d3.geo.jsonSource)
.pipe(d3.geo.rotate, elapsed * .0002 + Math.PI, -elapsed * .0001, 0)
.pipe(d3.geo.clipCircle, Math.PI / 2)
.pipe(d3.geo.rotate, Math.PI, 0, 0)
.pipe(d3.geo.project, d3.geo.orthographic, .3 / scale)
.sink(d3.geom.contextSink, context)
var renderFront = d3.geo.pipeline()
.source(d3.geo.jsonSource)
.pipe(d3.geo.rotate, elapsed * .0002, elapsed * .0001, 0)
.pipe(d3.geo.clipCircle, Math.PI / 2)
.pipe(d3.geo.project, d3.geo.orthographic, .3 / scale)
.sink(d3.geom.contextSink, context);
context.clearRect(0, 0, width, height);
context.save();
context.translate(width / 2, height / 2);
context.scale(scale, -scale);
context.beginPath();
renderBack(graticule);
context.lineWidth = 1 / scale;
context.strokeStyle = "#999";
context.stroke();
context.beginPath();
renderFront(graticule);
context.lineWidth = 1.5 / scale;
context.strokeStyle = "red";
context.stroke();
context.restore();
});
d3.select(self.frameElement).style("height", height + "px");
</script>
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