private float[,] ExpandBiasGridToMap(TWorld world, float[,] biasGrid, int biasGridSize)
{
var map = new float[world.Width, world.Height];
var biasToWorldX = ((biasGridSize - 1) / (double)world.Width);
var biasToWorldY = ((biasGridSize - 1) / (double)world.Height);
for (int x = 0; x < world.Width; x++)
{
for (int y = 0; y < world.Height; y++)
{
var biasX = (int)(x * biasToWorldX);
var biasY = (int)(y * biasToWorldY);
var ul = MapUtil.ValueAtOrDefault(biasGrid, biasX, biasY, 0);
var ur = MapUtil.ValueAtOrDefault(biasGrid, biasX + 1, biasY, 0);
var ll = MapUtil.ValueAtOrDefault(biasGrid, biasX, biasY + 1, 0);
var lr = MapUtil.ValueAtOrDefault(biasGrid, biasX + 1, biasY + 1, 0);
map[x, y] = (float)MapUtil.BilinerInterpolate(ul, ur, ll, lr,
(x - (biasX / biasToWorldX)) * biasToWorldX,
(y - (biasY / biasToWorldY)) * biasToWorldY);
}
}
return(map);
}