private List<Tuple<Vector3, Vector3>> generateTreePositions(GroundMap groundMap, ColorSurface normals)
{
var treeList = new List<Tuple<Vector3,Vector3>>();
var random = new Random();
for (var y = normals.Height - 2; y > 0; y--)
for (var x = normals.Width - 2; x > 0; x--)
{
var height = groundMap[x, y];
if ( height <3 || height > 5)
continue;
for (var currDetail = 0; currDetail < 5; currDetail++)
{
var rand1 = (float) random.NextDouble();
var rand2 = (float) random.NextDouble();
treeList.Add(new Tuple<Vector3, Vector3>(
new Vector3(
x + rand1,
groundMap.GetExactHeight(x, y, rand1, rand2),
y + rand2),
normals.AsVector3(x, y)));
}
}
return treeList;
}
private static List<Vector3> generateTreePositions(Texture2D treeMap, GroundMap groundMap, ColorSurface normals)
{
var treeMapColors = new Color[treeMap.Description.Width*treeMap.Description.Height];
treeMap. GetData(treeMapColors);
var sz = new Size2(treeMap.Description.Width, treeMap.Description.Height);
var noiseData = new int[sz.Width,sz.Height];
for (var x = 0; x < sz.Width; x++)
for (var y = 0; y < sz.Height; y++)
noiseData[x, y] = treeMapColors[y + x*sz.Height].R;
var treeList = new List<Vector3>();
var random = new Random();
var minFlatness = (float) Math.Cos(MathUtil.DegreesToRadians(15));
for (var y = normals.Height - 2; y > 0; y--)
for (var x = normals.Width - 2; x > 0; x--)
{
var terrainHeight = groundMap[x, y];
if ((terrainHeight <= 8) || (terrainHeight >= 14))
continue;
var flatness1 = Vector3.Dot(normals.AsVector3(x, y), Vector3.Up);
var flatness2 = Vector3.Dot(normals.AsVector3(x + 1, y + 1), Vector3.Up);
if (flatness1 <= minFlatness || flatness2 <= minFlatness)
continue;
var relx = (float) x/normals.Width;
var rely = (float) y/normals.Height;
float noiseValueAtCurrentPosition = noiseData[(int) (relx*sz.Width), (int) (rely*sz.Height)];
float treeDensity;
if (noiseValueAtCurrentPosition > 200)
treeDensity = 3;
else if (noiseValueAtCurrentPosition > 150)
treeDensity = 2;
else if (noiseValueAtCurrentPosition > 100)
treeDensity = 1;
else
treeDensity = 0;
for (var currDetail = 0; currDetail < treeDensity; currDetail++)
{
var rand1 = (float) random.NextDouble();
var rand2 = (float) random.NextDouble();
treeList.Add(new Vector3(
x + rand1,
groundMap.GetExactHeight(x, y, rand1, rand2),
y + rand2));
}
}
return treeList;
}