Function pow

docs/app/js/sanddance-app.js:75156–75161

(out, a, b)

    return out;
}
function pow(out, a, b) {
    ln(out, a);
    scale(out, out, b);
    exp(out, out);
    return out;
}
function slerp(out, a, b, t) {
    // benchmarks:
    //    http://jsperf.com/quaternion-slerp-implementations