Function setAxisAngle

docs/app/js/sanddance-app.js:75060–75068

(out, axis, rad)

    return out;
}
function setAxisAngle(out, axis, rad) {
    rad = rad * 0.5;
    var s = Math.sin(rad);
    out[0] = s * axis[0];
    out[1] = s * axis[1];
    out[2] = s * axis[2];
    out[3] = Math.cos(rad);
    return out;
}
function getAxisAngle(out_axis, q) {
    var rad = Math.acos(q[3]) * 2.0;
    var s = Math.sin(rad / 2.0);