bool Frustum::testPointlight(std::pair<int, int> &result, std::vector<Plane> planes, Vector3 center, float radius) {

    int x0=-1, x1=-1;
    for (int i = 0; i < planes.size(); i++) {
        if (planes[i].DotCoordinate(center)   <= radius ) {
            x0 = max(0,i-1);
            break;
        }
    }
    for (int i = planes.size()-1; i >= x0; i--) {
        if (-planes[i].DotCoordinate(center) <= radius) {
            x1 = min(i+1, planes.size() - 1);
            break;
        }
    }

    if (x0 == -1 || x1 == -1) return false;
    result.first = x0;
    result.second = x1;
    return true;
}