private async Task <List <Element> > GenerateElements(Terrain terrain, Rect rect, MassiveGrassProfile profile, int haltonOffset)
{
var list = new List <Element>();
var terrainPos = terrain.transform.position;
var terrainSize = terrain.terrainData.size.x;
var terrainXZPos = new Vector2(terrainPos.x, terrainPos.z);
var localRect = new Rect(rect.min - terrainXZPos, rect.size);
var localNormalizedRect = new Rect(localRect.position / terrainSize, localRect.size / terrainSize);
for (var i = 0; i < profile.AmountPerBlock; i++)
{
var haltonPos = new Vector2(HaltonSequence.Base2(i + haltonOffset), HaltonSequence.Base3(i + haltonOffset));
var normalizedPosition = localNormalizedRect.min +
haltonPos * localNormalizedRect.size;
var height = terrain.terrainData.GetInterpolatedHeight(normalizedPosition.x, normalizedPosition.y);
var normal = terrain.terrainData.GetInterpolatedNormal(normalizedPosition.x, normalizedPosition.y);
var position = haltonPos * rect.size + rect.min;
list.Add(
new Element(
i,
new Vector3(position.x, height, position.y),
normalizedPosition,
normal));
}
return(list);
}
public Vector2 Next()
{
index++;
return(new Vector2(
Range * HaltonSequence.Base2(index),
Range * HaltonSequence.Base3(index)));
}
private async Task <List <Element> > GenerateElements(Terrain terrain, Rect rect, MassiveGrassProfile profile,
int haltonOffset)
{
var context = SynchronizationContext.Current;
var terrainPos = terrain.transform.position;
var terrainSize = terrain.terrainData.size.x;
var terrainXZPos = new Vector2(terrainPos.x, terrainPos.z);
var localRect = new Rect(rect.min - terrainXZPos, rect.size);
var localNormalizedRect = new Rect(localRect.position / terrainSize, localRect.size / terrainSize);
var haltons = new Vector2[profile.AmountPerBlock];
var normalizedPositions = new Vector2[profile.AmountPerBlock];
var heights = new float[profile.AmountPerBlock];
var normals = new Vector3[profile.AmountPerBlock];
var list = new List <Element>();
var done = false;
var range = Enumerable.Range(0, profile.AmountPerBlock).ToArray();
list.AddRange(range.Select(_ => default(Element)));
await Task.Run(() =>
{
for (var i = 0; i < profile.AmountPerBlock; i++)
{
haltons[i] = new Vector2(
HaltonSequence.Base2(i + haltonOffset + profile.Seed),
HaltonSequence.Base3(i + haltonOffset + profile.Seed));
normalizedPositions[i] = localNormalizedRect.min + haltons[i] * localNormalizedRect.size;
}
});
await Task.Run(async() =>
{
context.Post(_ =>
{
for (var i = 0; i < profile.AmountPerBlock; i++)
{
if (terrain == null)
{
break;
}
var normalizedPosition = normalizedPositions[i];
heights[i] =
terrain.terrainData.GetInterpolatedHeight(normalizedPosition.x, normalizedPosition.y);
normals[i] =
terrain.terrainData.GetInterpolatedNormal(normalizedPosition.x, normalizedPosition.y);
}
done = true;
}, null);
});
while (!done)
{
await Task.Delay(1);
}
await Task.Run(() =>
{
for (var i = 0; i < profile.AmountPerBlock; i++)
{
var haltonPos = haltons[i];
var position = haltonPos *rect.size + rect.min;
var normalizedPosition = localNormalizedRect.min + haltons[i] * localNormalizedRect.size;
list[i] = new Element(
i,
new Vector3(position.x, heights[i], position.y),
normalizedPosition,
normals[i]);
}
});
return(list);
}