/// <summary>
/// Launchs foliage population asynchronous task
/// </summary>
/// <param name="scene">Scene</param>
/// <param name="node">Foliage Node</param>
/// <param name="map">Foliage map</param>
/// <param name="description">Terrain vegetation description</param>
/// <param name="gbbox">Relative bounding box to plant</param>
/// <param name="delay">Task delay</param>
public void Plant(Scene scene, QuadTreeNode node, FoliageMap map, FoliageMapChannel description, BoundingBox gbbox, int delay)
{
if (!this.Planting)
{
//Start planting task
this.CurrentNode = node;
this.Channel = description.Index;
this.Planting = true;
Task
.Run(async() =>
{
await Task.Delay(delay);
return(PlantTask(scene, node, map, description, gbbox));
})
.ContinueWith((t) =>
{
this.Planting = false;
this.Planted = true;
this.foliageData = t.Result;
});
}
}
/// <summary>
/// Asynchronous planting task
/// </summary>
/// <param name="scene">Scene</param>
/// <param name="node">Node to process</param>
/// <param name="map">Foliage map</param>
/// <param name="description">Vegetation task</param>
/// <param name="gbbox">Relative bounding box to plant</param>
/// <returns>Returns generated vertex data</returns>
private static IEnumerable <VertexBillboard> PlantTask(Scene scene, QuadTreeNode node, FoliageMap map, FoliageMapChannel description, BoundingBox gbbox)
{
if (node == null)
{
return(new VertexBillboard[] { });
}
List <VertexBillboard> vertexData = new List <VertexBillboard>(MAX);
Vector2 min = new Vector2(gbbox.Minimum.X, gbbox.Minimum.Z);
Vector2 max = new Vector2(gbbox.Maximum.X, gbbox.Maximum.Z);
Random rnd = new Random(description.Seed);
var bbox = node.BoundingBox;
int count = (int)Math.Min(MAX, MAX * description.Saturation);
int iterations = MAX * 2;
//Number of points
while (count > 0 && iterations > 0)
{
iterations--;
Vector3 pos = new Vector3(
rnd.NextFloat(bbox.Minimum.X, bbox.Maximum.X),
bbox.Maximum.Y + 1f,
rnd.NextFloat(bbox.Minimum.Z, bbox.Maximum.Z));
bool plant = false;
if (map != null)
{
var c = map.GetRelative(pos, min, max);
if (c[description.Index] > 0)
{
plant = rnd.NextFloat(0, 1) < (c[description.Index]);
}
}
else
{
plant = true;
}
if (plant)
{
var size = new Vector2(
rnd.NextFloat(description.MinSize.X, description.MaxSize.X),
rnd.NextFloat(description.MinSize.Y, description.MaxSize.Y));
var planted = Plant(scene, pos, size, out var res);
if (planted)
{
vertexData.Add(res);
count--;
}
}
else
{
count--;
}
}
return(vertexData.ToArray());
}
