Function transformMat3

docs/app/js/sanddance-app.js:70012–70017

(out, a, m)

    return out;
}
function transformMat3(out, a, m) {
    var x = a[0], y = a[1];
    out[0] = m[0] * x + m[3] * y + m[6];
    out[1] = m[1] * x + m[4] * y + m[7];
    return out;
}
function transformMat4(out, a, m) {
    var x = a[0];
    var y = a[1];