/// <summary>`source` size must be dividable by `N`</summary>
public static Model create(ref Map source, int N, Vec2i outputSize)
{
if (outputSize.x % N != 0 || outputSize.y % N != 0)
{
throw new System.Exception($"output size {outputSize} must be dividable with N={N}");
}
var gridSize = outputSize / N;
var patterns = RuleData.extractEveryChunk(ref source, N, PatternUtil.variations);
var rule = AdjacencyModel.buildRule(patterns, ref source);
return(new Model(gridSize, patterns, rule));
}
