private IEnumerable <Vector3> GetLightsDistributionPoisson(int size, float θFrom, float θTo)
{
Vector2[] poisson;
if (size >= 1000)
{
if (_poissonDisk == null && _poissonDiskWeak != null && _poissonDiskWeak.TryGetTarget(out var value))
{
_poissonDisk = value;
}
if (_poissonDisk?.Count != size)
{
_poissonDisk = UniformPoissonDiskSampler.SampleSquare(size, false);
_poissonDiskWeak = new WeakReference <List <Vector2> >(_poissonDisk);
}
poisson = _poissonDisk.ToArray();
}
else
{
poisson = UniformPoissonDiskSampler.SampleSquare(size, false).ToArray();
}
CropPoisson(poisson, (θFrom.ToRadians() + MathF.PI / 2f).Cos(), (θTo.ToRadians() + MathF.PI / 2f).Cos());
foreach (var point in poisson)
{
var θ = point.Y.Clamp(-0.9999f, 0.9999f).Acos() - MathF.PI / 2f;
var φ = point.X * MathF.PI;
var direction = MathF.ToVector3Rad(θ, φ);
yield return(direction);
}
}
private void InitializeAccumulationDof()
{
_lazyAccumulationDofPoissonDiskSamples = Lazier.Create(() => Reorder(UniformPoissonDiskSampler.SampleCircle(_accumulationDofIterations)));
_lazyAccumulationDofPoissonSquareSamples = Lazier.Create(() => UniformPoissonDiskSampler.SampleSquare(_accumulationDofIterations, false).ToArray());
}