void UpdatePolygonColorAtIndex(int indexX, int indexY, int rangeX, int rangeY, byte alpha, bool isBorder = false)
{
for (int x = -rangeX; x <= rangeX; x++)
{
for (int y = -rangeY; y <= rangeY; y++)
{
if (isBorder)
{
if (x != -rangeX && x != rangeX && y != -rangeY && y != rangeY)
{
continue;
}
}
if (
_plane.isWithinRange((indexX + x), (indexY + y)) &&
_plane[indexX + x, indexY + y].getAlpha() > alpha)
{
_plane.UpdatePolygonColorAtIndex(indexX + x, indexY + y, new Color32(0, 0, 0, alpha));
}
}
}
}