public static Star[] Generate(Random rand, int count)
{
float minRad = 1f / 16f;
float maxRad = 1f / 2f;
float near = 8f;
float far = 32f;
var stars = new Star[count];
for (int i = 0; i < count; ++i)
{
float shift = rand.NextSingle() * 2f - 1f;
float rad = minRad + (float)Math.Pow(rand.NextDouble(), 16) * (maxRad - minRad);
var pos = Starfield.GetRandomPosition(rand, near, far);
var clr = new Color4(0.9f + shift * 0.1f, 0.9f - Math.Abs(shift) * 0.2f, 0.85f - shift * 0.1f, 1f);
var star = new Star(pos, rad, clr);
stars[i] = star;
}
Array.Sort(stars, Starfield.Comparer);
return(stars);
}
public static DustCloud[] Generate(Random rand, int count)
{
float minRad = 1f;
float maxRad = 16f;
float near = 20f;
float far = 32f;
var clrPairs = new Color4[, ] {
{ Color4.Red, Color4.Blue }
};
int variation = rand.Next(16, 32);
var seta = new Vector3[variation];
var setb = new Vector3[variation];
for (int i = 0; i < variation; ++i)
{
seta[i] = Starfield.GetRandomPosition(rand, near, far);
setb[i] = Starfield.GetRandomPosition(rand, near, far);
}
int index = rand.Next(clrPairs.GetLength(0));
var clra = clrPairs[index, 0];
var clrb = clrPairs[index, 1];
var dusts = new DustCloud[count];
for (int i = 0; i < count; ++i)
{
var pos = Starfield.GetRandomPosition(rand, near, far);
float scale = (float)Math.Pow(rand.NextDouble(), 4);
float rad = minRad + scale * (maxRad - minRad);
float alpha = (1 - scale) / 96f;
var suma = seta.Sum(x => 1f / Math.Max(0.125f, (pos - x).LengthSquared));
var sumb = setb.Sum(x => 1f / Math.Max(0.125f, (pos - x).LengthSquared));
var shift = (suma * suma) / ((suma * suma) + (sumb * sumb));
var clr = new Color4(
clra.R * shift + clrb.R * (1f - shift),
clra.G * shift + clrb.G * (1f - shift),
clra.B * shift + clrb.B * (1f - shift),
alpha);
var dust = new DustCloud(pos, rad, clr);
dusts[i] = dust;
}
Array.Sort(dusts, Starfield.Comparer);
return(dusts);
}
