private byte[] ColorMap()
{
var map = new byte[3 * Netsize];
var index = new int[Netsize];
for (int i = 0; i < Netsize; i++)
index[_network[i][3]] = i;
int k = 0;
for (int i = 0; i < Netsize; i++)
{
int j = index[i];
map[k++] = (byte)(_network[j][0]);
map[k++] = (byte)(_network[j][1]);
map[k++] = (byte)(_network[j][2]);
}
return map;
}