Commit bbb74f7

var δ2 = .5, cosMinDistance = Math.cos(1 * d3_radians), maxDepth = 16;

var c = d3_geo_cartesian([ λ, φ ]), p = project(λ, φ), buffer = [];

resampleLineTo(x0, y0, λ0, a0, b0, c0, x0 = p[0], y0 = p[1], λ0 = λ, a0 = c[0], b0 = c[1], c0 = c[2], maxDepth, buffer);

streamLine(buffer, stream);

var buffer = [];

resampleLineTo(x0, y0, λ0, a0, b0, c0, x00, y00, λ00, a00, b00, c00, maxDepth, buffer);

streamLine(buffer, stream);

function streamLine(line, stream) {

for (var i = 0, n = line.length, point; i < n; ++i) {

stream.point((point = line[i])[0], point[1]);

}

}

function resampleLineTo(x0, y0, λ0, a0, b0, c0, x1, y1, λ1, a1, b1, c1, depth, buffer) {

var a = a0 + a1, b = b0 + b1, c = c0 + c1, m = Math.sqrt(a * a + b * b + c * c), φ2 = Math.asin(c /= m), λ2 = Math.abs(Math.abs(c) - 1) < ε ? (λ0 + λ1) / 2 : Math.atan2(b, a), p = project(λ2, φ2), x2 = p[0], y2 = p[1], dx2 = x2 - x0, dy2 = y2 - y0, dz = dy * dx2 - dx * dy2, curve = dz * dz / d2 > δ2 || Math.abs((dx * dx2 + dy * dy2) / d2 - .5) > .3;

if (curve || a0 * a1 + b0 * b1 + c0 * c1 < cosMinDistance) {

var s0 = resampleLineTo(x0, y0, λ0, a0, b0, c0, x2, y2, λ2, a /= m, b /= m, c, depth, buffer);

buffer.push(p);

var s1 = resampleLineTo(x2, y2, λ2, a, b, c, x1, y1, λ1, a1, b1, c1, depth, buffer);

return curve || s0 || s1 || (buffer.pop(), false);