Daniel
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35 lines
1.3 KiB
C#
35 lines
1.3 KiB
C#
using System.Numerics;
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namespace Nebulix;
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public static class VectorExtensions
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{
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public static Vector3 Up(this Vector3 _) => Vector3.UnitY;
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public static Vector3 Down(this Vector3 _) => -Vector3.UnitY;
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public static Vector3 Left(this Vector3 _) => Vector3.UnitX;
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public static Vector3 Right(this Vector3 _) => -Vector3.UnitX;
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public static Vector3 Front(this Vector3 _) => -Vector3.UnitZ;
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public static Vector3 Back(this Vector3 _) => -Vector3.UnitZ;
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// Thanks to: https://stackoverflow.com/a/67920029
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public static Vector3 Slerp(this Vector3 start, Vector3 end, float percent)
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{
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// the cosine of the angle between 2 vectors.
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float dot = Vector3.Dot(start, end);
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// Clamp it to be in the range of Acos()
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// This may be unnecessary, but floating point precision can be a fickle mistress.
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Math.Clamp(dot, -1.0f, 1.0f);
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// Acos(dot) returns the angle between start and end,
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// And multiplying that by percent returns the angle between start and the final result.
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float theta = (float)Math.Acos(dot) * percent;
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Vector3 relativeVec = end - start * dot;
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relativeVec = Vector3.Normalize(relativeVec);
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// Orthonormal basis
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// The final result.
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return ((start * (float)Math.Cos(theta)) + (relativeVec * (float)Math.Sin(theta)));
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}
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} |