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(#35) Add Random.NextUnitVector3
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@ -31,6 +31,33 @@ namespace X10D.RandomExtensions
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return new Vector2(x, y);
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return new Vector2(x, y);
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}
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}
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/// <summary>
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/// Returns a <see cref="Vector3" /> with magnitude 1 whose components indicate a random point on the unit sphere.
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/// </summary>
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/// <param name="random">The <see cref="System.Random" /> instance</param>
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/// <returns>
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/// A <see cref="Vector3" /> whose <see cref="Vector3.Length()" /> returns 1, and whose components indicate a random
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/// point on the unit sphere.
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/// </returns>
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public static Vector3 NextUnitVector3(this Random random)
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{
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if (random is null)
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{
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throw new ArgumentNullException(nameof(random));
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}
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var seed = random.Next();
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var seededRandom = new Random(seed);
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var angle = seededRandom.NextSingle(0, 360).DegreesToRadians();
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var z = seededRandom.NextSingle(-1, 1);
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var mp = MathF.Sqrt(1 - z * z);
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var x = mp * MathF.Cos(angle);
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var y = mp * MathF.Sin(angle);
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return new Vector3(x, y, z);
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}
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}
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}
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}
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}
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