Function exp

docs/app/js/sanddance-app.js:75135–75145

(out, a)

    return out;
}
function exp(out, a) {
    var x = a[0], y = a[1], z = a[2], w = a[3];
    var r = Math.sqrt(x * x + y * y + z * z);
    var et = Math.exp(w);
    var s = r > 0 ? et * Math.sin(r) / r : 0;
    out[0] = x * s;
    out[1] = y * s;
    out[2] = z * s;
    out[3] = et * Math.cos(r);
    return out;
}
function ln(out, a) {
    var x = a[0], y = a[1], z = a[2], w = a[3];
    var r = Math.sqrt(x * x + y * y + z * z);