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Code Issues

(#35) Add Random.NextRotationUniform

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This commit is contained in:
Oliver Booth 2021-03-10 10:49:55 +00:00
parent cb7673c9a4
commit a32fe8cc4a
1 changed files with 31 additions and 0 deletions
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31
X10D/src/RandomExtensions/RandomExtensions.Numerics.cs
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@ -33,6 +33,37 @@ namespace X10D.RandomExtensions
return Quaternion.CreateFromYawPitchRoll(y, x, z);
}
/// <summary>
/// Returns a randomly generated rotation with uniform distribution.
/// </summary>
/// <param name="random">The <see cref="System.Random" /> instance.</param>
/// <returns>A <see cref="Quaternion" /> constructed with uniform distribution.</returns>
/// <exception cref="ArgumentNullException"><paramref name="random" /> is <see langword="null" />.</exception>
public static Quaternion NextRotationUniform(this Random random)
{
if (random is null)
{
throw new ArgumentNullException(nameof(random));
}
var seed = random.Next();
var seededRandom = new Random(seed);
float normal, w, x, y, z;
do
{
w = seededRandom.NextSingle(-1f, 1f);
x = seededRandom.NextSingle(-1f, 1f);
y = seededRandom.NextSingle(-1f, 1f);
z = seededRandom.NextSingle(-1f, 1f);
normal = w * w + x * x + y * y + z * z;
}
while (normal > 1f || normal == 0f);
normal = MathF.Sqrt(normal);
return new Quaternion(x / normal, y / normal, z / normal, w / normal);
}
/// <summary>
/// Returns a <see cref="Vector2" /> with magnitude 1 whose components indicate a random point on the unit circle.
/// </summary>