void AddFieldEffects(byte[,] from, byte[,] to, byte when, int iterations, byte step)
{
byte fronteer = when;
int xsizem1 = MaxXPt - 1;
while (iterations-- > 0)
{
byte self = (byte)(fronteer - step);
for (int y = MaxYPt - 1; y > 0; y--)
{
for (int x = xsizem1; x > 0; x--)
{
byte b = from[x, y];
if (b > 2 && b < fronteer)
{
if (SimPathStore.Special(b) && b != SimPathStore.BRIDGY)
{
continue;
}
if (SurroundingBlocked0(x, y, fronteer, from) > 1)
{
to[x, y] = self;
}
}
}
}
fronteer -= step;
}
}