public void Build(IMap<float> heightMap)
{
if (level == 0)
{
// a leaf node.
int limitX = Math.Min(heightMap.Width, x + size + 1);
int limitY = Math.Min(heightMap.Height, y + size + 1);
heightMap.MinMax(x, y, limitX - x, limitY - y, out minHeight, out maxHeight);
}
else
{
childTopLeft.Build(heightMap);
minHeight = childTopLeft.minHeight;
maxHeight = childTopLeft.maxHeight;
if (childTopRight != null)
{
childTopRight.Build(heightMap);
minHeight = MathHelper.Min(minHeight, childTopRight.minHeight);
maxHeight = MathHelper.Max(maxHeight, childTopRight.maxHeight);
}
if (childBottomLeft != null)
{
childBottomLeft.Build(heightMap);
minHeight = MathHelper.Min(minHeight, childBottomLeft.minHeight);
maxHeight = MathHelper.Max(maxHeight, childBottomLeft.maxHeight);
}
if (childBottomRight != null)
{
childBottomRight.Build(heightMap);
minHeight = MathHelper.Min(minHeight, childBottomRight.minHeight);
maxHeight = MathHelper.Max(maxHeight, childBottomRight.maxHeight);
}
}
}