// Returns the number of instances _actually_ created
public int AddPlantInstances(Boundary boundary, Vector2 tileLocation, int pageSize, Random rand)
{
float scaleWidthRange = scaleWidthHi - scaleWidthLow;
float scaleHeightRange = scaleHeightHi - scaleHeightLow;
float colorRange = colorMultHi - colorMultLow;
instances = new List <PlantInstance>();
for (int i = 0; i < numInstances; i++)
{
// Generate random locations within the block. =
Vector2 coordsInTile = new Vector2((float)rand.NextDouble(), (float)rand.NextDouble()) *
pageSize * TerrainManager.oneMeter;;
Vector2 worldCoords = coordsInTile + tileLocation;
if (boundary.PointIn(new Vector3(worldCoords.x, 0, worldCoords.y)))
{
float colorScale = (((float)rand.NextDouble() * colorRange) + colorMultLow);
ColorEx tmpColor = new ColorEx(color.r * colorScale, color.g * colorScale, color.b * colorScale);
instances.Add(new PlantInstance(coordsInTile,
(float)rand.NextDouble() * scaleWidthRange + scaleWidthLow,
(float)rand.NextDouble() * scaleHeightRange + scaleHeightLow,
tmpColor, windMagnitude));
}
}
return(instances.Count);
}
/// <summary>
/// Select a random location within the boundary area for a tree. First we pick a random spot
/// within the 2D rectangular bounds of the boundary, and then perform an intersection test of
/// the point against the actual boundary shape. If the selected point is not in the boundary
/// area, then we pick another random number and try again.
/// </summary>
/// <returns></returns>
private Vector3 RandomLocation()
{
float x;
float z;
Vector3 v;
do
{
x = ((float)rand.NextDouble()) * sizeX + offX;
z = ((float)rand.NextDouble()) * sizeZ + offZ;
v = new Vector3(x, 0, z);
} while (!boundary.PointIn(v));
return(new Vector3(x, TerrainManager.Instance.GetTerrainHeight(v, GetHeightMode.Interpolate, GetHeightLOD.MaxLOD), z));
}
