25 if (copyFrom.tileValid ==
null)
31 tileValid =
new int[copyFrom.tileValid.Length];
34 if (copyFrom.tileInvalid ==
null)
43 if (copyFrom.tileAlternates ==
null)
52 if (copyFrom.wallValid ==
null)
57 wallValid =
new int[copyFrom.wallValid.Length];