static IntPoint3? GetLocNearEntry(EnvironmentObject env)
{
foreach (var p in IntPoint2.SquareSpiral(env.StartLocation.ToIntPoint(), env.Width / 2))
{
if (env.Size.Plane.Contains(p) == false)
continue;
var z = env.GetDepth(p);
var p3 = new IntPoint3(p, z);
if (EnvironmentHelpers.CanEnter(env, p3))
return p3;
}
return null;
}