forked from MoonsideGames/MoonWorks
990 lines
33 KiB
C#
990 lines
33 KiB
C#
#region License
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/* MoonWorks - Game Development Framework
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* Copyright 2021 Evan Hemsley
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*/
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/* Derived from code by Ethan Lee (Copyright 2009-2021).
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* Released under the Microsoft Public License.
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* See fna.LICENSE for details.
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* Derived from code by the Mono.Xna Team (Copyright 2006).
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* Released under the MIT License. See monoxna.LICENSE for details.
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*/
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#endregion
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#region Using Statements
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using System;
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using System.Diagnostics;
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#endregion
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namespace MoonWorks.Math
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{
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/// <summary>
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/// An efficient mathematical representation for three dimensional rotations.
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/// </summary>
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[Serializable]
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[DebuggerDisplay("{DebugDisplayString,nq}")]
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public struct Quaternion : IEquatable<Quaternion>
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{
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#region Public Static Properties
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/// <summary>
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/// Returns a quaternion representing no rotation.
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/// </summary>
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public static Quaternion Identity
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{
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get
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{
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return identity;
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}
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}
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#endregion
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#region Internal Properties
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internal string DebugDisplayString
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{
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get
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{
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if (this == Quaternion.Identity)
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{
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return "Identity";
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}
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return string.Concat(
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X.ToString(), " ",
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Y.ToString(), " ",
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Z.ToString(), " ",
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W.ToString()
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);
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}
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}
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#endregion
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#region Public Fields
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/// <summary>
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/// The x coordinate of this <see cref="Quaternion"/>.
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/// </summary>
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public float X;
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/// <summary>
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/// The y coordinate of this <see cref="Quaternion"/>.
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/// </summary>
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public float Y;
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/// <summary>
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/// The z coordinate of this <see cref="Quaternion"/>.
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/// </summary>
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public float Z;
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/// <summary>
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/// The rotation component of this <see cref="Quaternion"/>.
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/// </summary>
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public float W;
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#endregion
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#region Private Static Variables
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private static readonly Quaternion identity = new Quaternion(0, 0, 0, 1);
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#endregion
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#region Public Constructors
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/// <summary>
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/// Constructs a quaternion with X, Y, Z and W from four values.
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/// </summary>
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/// <param name="x">The x coordinate in 3d-space.</param>
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/// <param name="y">The y coordinate in 3d-space.</param>
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/// <param name="z">The z coordinate in 3d-space.</param>
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/// <param name="w">The rotation component.</param>
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public Quaternion(float x, float y, float z, float w)
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{
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this.X = x;
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this.Y = y;
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this.Z = z;
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this.W = w;
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}
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/// <summary>
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/// Constructs a quaternion with X, Y, Z from <see cref="Vector3"/> and rotation component from a scalar.
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/// </summary>
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/// <param name="value">The x, y, z coordinates in 3d-space.</param>
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/// <param name="w">The rotation component.</param>
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public Quaternion(Vector3 vectorPart, float scalarPart)
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{
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this.X = vectorPart.X;
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this.Y = vectorPart.Y;
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this.Z = vectorPart.Z;
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this.W = scalarPart;
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}
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#endregion
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#region Public Methods
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/// <summary>
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/// Transforms this quaternion into its conjugated version.
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/// </summary>
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public void Conjugate()
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{
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X = -X;
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Y = -Y;
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Z = -Z;
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}
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/// <summary>
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/// Compares whether current instance is equal to specified <see cref="Object"/>.
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/// </summary>
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/// <param name="obj">The <see cref="Object"/> to compare.</param>
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/// <returns><c>true</c> if the instances are equal; <c>false</c> otherwise.</returns>
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public override bool Equals(object obj)
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{
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return (obj is Quaternion) && Equals((Quaternion) obj);
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}
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/// <summary>
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/// Compares whether current instance is equal to specified <see cref="Quaternion"/>.
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/// </summary>
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/// <param name="other">The <see cref="Quaternion"/> to compare.</param>
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/// <returns><c>true</c> if the instances are equal; <c>false</c> otherwise.</returns>
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public bool Equals(Quaternion other)
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{
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return ( X == other.X &&
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Y == other.Y &&
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Z == other.Z &&
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W == other.W );
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}
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/// <summary>
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/// Gets the hash code of this <see cref="Quaternion"/>.
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/// </summary>
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/// <returns>Hash code of this <see cref="Quaternion"/>.</returns>
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public override int GetHashCode()
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{
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return (
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this.X.GetHashCode() +
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this.Y.GetHashCode() +
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this.Z.GetHashCode() +
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this.W.GetHashCode()
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);
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}
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/// <summary>
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/// Returns the magnitude of the quaternion components.
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/// </summary>
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/// <returns>The magnitude of the quaternion components.</returns>
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public float Length()
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{
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float num = (
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(this.X * this.X) +
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(this.Y * this.Y) +
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(this.Z * this.Z) +
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(this.W * this.W)
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);
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return (float) System.Math.Sqrt((double) num);
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}
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/// <summary>
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/// Returns the squared magnitude of the quaternion components.
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/// </summary>
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/// <returns>The squared magnitude of the quaternion components.</returns>
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public float LengthSquared()
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{
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return (
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(this.X * this.X) +
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(this.Y * this.Y) +
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(this.Z * this.Z) +
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(this.W * this.W)
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);
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}
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/// <summary>
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/// Scales the quaternion magnitude to unit length.
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/// </summary>
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public void Normalize()
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{
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float num = 1.0f / ((float) System.Math.Sqrt(
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(X * X) +
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(Y * Y) +
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(Z * Z) +
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(W * W)
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));
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this.X *= num;
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this.Y *= num;
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this.Z *= num;
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this.W *= num;
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}
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/// <summary>
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/// Returns a <see cref="String"/> representation of this <see cref="Quaternion"/> in the format:
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/// {X:[<see cref="X"/>] Y:[<see cref="Y"/>] Z:[<see cref="Z"/>] W:[<see cref="W"/>]}
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/// </summary>
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/// <returns>A <see cref="String"/> representation of this <see cref="Quaternion"/>.</returns>
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public override string ToString()
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{
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return (
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"{X:" + X.ToString() +
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" Y:" + Y.ToString() +
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" Z:" + Z.ToString() +
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" W:" + W.ToString() +
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"}"
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);
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}
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#endregion
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#region Public Static Methods
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/// <summary>
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/// Creates a new <see cref="Quaternion"/> that contains the sum of two quaternions.
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/// </summary>
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/// <param name="quaternion1">Source <see cref="Quaternion"/>.</param>
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/// <param name="quaternion2">Source <see cref="Quaternion"/>.</param>
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/// <returns>The result of the quaternion addition.</returns>
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public static Quaternion Add(Quaternion quaternion1, Quaternion quaternion2)
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{
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Quaternion quaternion;
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Add(ref quaternion1, ref quaternion2, out quaternion);
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return quaternion;
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}
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/// <summary>
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/// Creates a new <see cref="Quaternion"/> that contains the sum of two quaternions.
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/// </summary>
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/// <param name="quaternion1">Source <see cref="Quaternion"/>.</param>
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/// <param name="quaternion2">Source <see cref="Quaternion"/>.</param>
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/// <param name="result">The result of the quaternion addition as an output parameter.</param>
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public static void Add(
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ref Quaternion quaternion1,
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ref Quaternion quaternion2,
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out Quaternion result
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) {
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result.X = quaternion1.X + quaternion2.X;
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result.Y = quaternion1.Y + quaternion2.Y;
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result.Z = quaternion1.Z + quaternion2.Z;
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result.W = quaternion1.W + quaternion2.W;
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}
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/// <summary>
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/// Creates a new <see cref="Quaternion"/> that contains concatenation between two quaternion.
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/// </summary>
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/// <param name="value1">The first <see cref="Quaternion"/> to concatenate.</param>
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/// <param name="value2">The second <see cref="Quaternion"/> to concatenate.</param>
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/// <returns>The result of rotation of <paramref name="value1"/> followed by <paramref name="value2"/> rotation.</returns>
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public static Quaternion Concatenate(Quaternion value1, Quaternion value2)
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{
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Quaternion quaternion;
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Concatenate(ref value1, ref value2, out quaternion);
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return quaternion;
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}
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/// <summary>
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/// Creates a new <see cref="Quaternion"/> that contains concatenation between two quaternion.
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/// </summary>
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/// <param name="value1">The first <see cref="Quaternion"/> to concatenate.</param>
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/// <param name="value2">The second <see cref="Quaternion"/> to concatenate.</param>
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/// <param name="result">The result of rotation of <paramref name="value1"/> followed by <paramref name="value2"/> rotation as an output parameter.</param>
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public static void Concatenate(
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ref Quaternion value1,
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ref Quaternion value2,
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out Quaternion result
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) {
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float x1 = value1.X;
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float y1 = value1.Y;
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float z1 = value1.Z;
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float w1 = value1.W;
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float x2 = value2.X;
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float y2 = value2.Y;
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float z2 = value2.Z;
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float w2 = value2.W;
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result.X = ((x2 * w1) + (x1 * w2)) + ((y2 * z1) - (z2 * y1));
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result.Y = ((y2 * w1) + (y1 * w2)) + ((z2 * x1) - (x2 * z1));
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result.Z = ((z2 * w1) + (z1 * w2)) + ((x2 * y1) - (y2 * x1));
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result.W = (w2 * w1) - (((x2 * x1) + (y2 * y1)) + (z2 * z1));
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}
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/// <summary>
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/// Creates a new <see cref="Quaternion"/> that contains conjugated version of the specified quaternion.
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/// </summary>
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/// <param name="value">The quaternion which values will be used to create the conjugated version.</param>
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/// <returns>The conjugate version of the specified quaternion.</returns>
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public static Quaternion Conjugate(Quaternion value)
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{
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return new Quaternion(-value.X, -value.Y, -value.Z, value.W);
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}
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/// <summary>
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/// Creates a new <see cref="Quaternion"/> that contains conjugated version of the specified quaternion.
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/// </summary>
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/// <param name="value">The quaternion which values will be used to create the conjugated version.</param>
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/// <param name="result">The conjugated version of the specified quaternion as an output parameter.</param>
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public static void Conjugate(ref Quaternion value, out Quaternion result)
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{
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result.X = -value.X;
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result.Y = -value.Y;
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result.Z = -value.Z;
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result.W = value.W;
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}
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/// <summary>
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/// Creates a new <see cref="Quaternion"/> from the specified axis and angle.
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/// </summary>
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/// <param name="axis">The axis of rotation.</param>
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/// <param name="angle">The angle in radians.</param>
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/// <returns>The new quaternion builded from axis and angle.</returns>
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public static Quaternion CreateFromAxisAngle(Vector3 axis, float angle)
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{
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Quaternion quaternion;
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CreateFromAxisAngle(ref axis, angle, out quaternion);
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return quaternion;
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}
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/// <summary>
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/// Creates a new <see cref="Quaternion"/> from the specified axis and angle.
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/// </summary>
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/// <param name="axis">The axis of rotation.</param>
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/// <param name="angle">The angle in radians.</param>
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/// <param name="result">The new quaternion builded from axis and angle as an output parameter.</param>
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public static void CreateFromAxisAngle(
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ref Vector3 axis,
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float angle,
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out Quaternion result
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) {
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float half = angle * 0.5f;
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float sin = (float) System.Math.Sin((double) half);
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float cos = (float) System.Math.Cos((double) half);
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result.X = axis.X * sin;
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result.Y = axis.Y * sin;
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result.Z = axis.Z * sin;
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result.W = cos;
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}
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/// <summary>
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/// Creates a new <see cref="Quaternion"/> from the specified <see cref="Matrix4x4"/>.
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/// </summary>
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/// <param name="matrix">The rotation matrix.</param>
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/// <returns>A quaternion composed from the rotation part of the matrix.</returns>
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public static Quaternion CreateFromRotationMatrix(Matrix4x4 matrix)
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{
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Quaternion quaternion;
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CreateFromRotationMatrix(ref matrix, out quaternion);
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return quaternion;
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}
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/// <summary>
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/// Creates a new <see cref="Quaternion"/> from the specified <see cref="Matrix4x4"/>.
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/// </summary>
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/// <param name="matrix">The rotation matrix.</param>
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/// <param name="result">A quaternion composed from the rotation part of the matrix as an output parameter.</param>
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public static void CreateFromRotationMatrix(ref Matrix4x4 matrix, out Quaternion result)
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{
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float sqrt;
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float half;
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float scale = matrix.M11 + matrix.M22 + matrix.M33;
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if (scale > 0.0f)
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{
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sqrt = (float) System.Math.Sqrt(scale + 1.0f);
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result.W = sqrt * 0.5f;
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sqrt = 0.5f / sqrt;
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result.X = (matrix.M23 - matrix.M32) * sqrt;
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result.Y = (matrix.M31 - matrix.M13) * sqrt;
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result.Z = (matrix.M12 - matrix.M21) * sqrt;
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}
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else if ((matrix.M11 >= matrix.M22) && (matrix.M11 >= matrix.M33))
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{
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sqrt = (float) System.Math.Sqrt(1.0f + matrix.M11 - matrix.M22 - matrix.M33);
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half = 0.5f / sqrt;
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result.X = 0.5f * sqrt;
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result.Y = (matrix.M12 + matrix.M21) * half;
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result.Z = (matrix.M13 + matrix.M31) * half;
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result.W = (matrix.M23 - matrix.M32) * half;
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}
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else if (matrix.M22 > matrix.M33)
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{
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sqrt = (float) System.Math.Sqrt(1.0f + matrix.M22 - matrix.M11 - matrix.M33);
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half = 0.5f/sqrt;
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result.X = (matrix.M21 + matrix.M12)*half;
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result.Y = 0.5f*sqrt;
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result.Z = (matrix.M32 + matrix.M23)*half;
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result.W = (matrix.M31 - matrix.M13)*half;
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}
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else
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{
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sqrt = (float) System.Math.Sqrt(1.0f + matrix.M33 - matrix.M11 - matrix.M22);
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half = 0.5f / sqrt;
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result.X = (matrix.M31 + matrix.M13) * half;
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result.Y = (matrix.M32 + matrix.M23) * half;
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result.Z = 0.5f * sqrt;
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result.W = (matrix.M12 - matrix.M21) * half;
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}
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}
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/// <summary>
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/// Creates a new <see cref="Quaternion"/> from the specified yaw, pitch and roll angles.
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/// </summary>
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/// <param name="yaw">Yaw around the y axis in radians.</param>
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/// <param name="pitch">Pitch around the x axis in radians.</param>
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/// <param name="roll">Roll around the z axis in radians.</param>
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/// <returns>A new quaternion from the concatenated yaw, pitch, and roll angles.</returns>
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public static Quaternion CreateFromYawPitchRoll(float yaw, float pitch, float roll)
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{
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Quaternion quaternion;
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CreateFromYawPitchRoll(yaw, pitch, roll, out quaternion);
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return quaternion;
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}
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/// <summary>
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/// Creates a new <see cref="Quaternion"/> from the specified yaw, pitch and roll angles.
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/// </summary>
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/// <param name="yaw">Yaw around the y axis in radians.</param>
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/// <param name="pitch">Pitch around the x axis in radians.</param>
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/// <param name="roll">Roll around the z axis in radians.</param>
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/// <param name="result">A new quaternion from the concatenated yaw, pitch, and roll angles as an output parameter.</param>
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public static void CreateFromYawPitchRoll(
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float yaw,
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float pitch,
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float roll,
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out Quaternion result)
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{
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float halfRoll = roll * 0.5f;
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float sinRoll = (float) System.Math.Sin(halfRoll);
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float cosRoll = (float) System.Math.Cos(halfRoll);
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float halfPitch = pitch * 0.5f;
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float sinPitch = (float) System.Math.Sin(halfPitch);
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float cosPitch = (float) System.Math.Cos(halfPitch);
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float halfYaw = yaw * 0.5f;
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float sinYaw = (float) System.Math.Sin(halfYaw);
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float cosYaw = (float) System.Math.Cos(halfYaw);
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result.X = ((cosYaw * sinPitch) * cosRoll) + ((sinYaw * cosPitch) * sinRoll);
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result.Y = ((sinYaw * cosPitch) * cosRoll) - ((cosYaw * sinPitch) * sinRoll);
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result.Z = ((cosYaw * cosPitch) * sinRoll) - ((sinYaw * sinPitch) * cosRoll);
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result.W = ((cosYaw * cosPitch) * cosRoll) + ((sinYaw * sinPitch) * sinRoll);
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}
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/// <summary>
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/// Divides a <see cref="Quaternion"/> by the other <see cref="Quaternion"/>.
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/// </summary>
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/// <param name="quaternion1">Source <see cref="Quaternion"/>.</param>
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/// <param name="quaternion2">Divisor <see cref="Quaternion"/>.</param>
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/// <returns>The result of dividing the quaternions.</returns>
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public static Quaternion Divide(Quaternion quaternion1, Quaternion quaternion2)
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{
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Quaternion quaternion;
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Divide(ref quaternion1, ref quaternion2, out quaternion);
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return quaternion;
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}
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/// <summary>
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/// Divides a <see cref="Quaternion"/> by the other <see cref="Quaternion"/>.
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/// </summary>
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/// <param name="quaternion1">Source <see cref="Quaternion"/>.</param>
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|
/// <param name="quaternion2">Divisor <see cref="Quaternion"/>.</param>
|
|
/// <param name="result">The result of dividing the quaternions as an output parameter.</param>
|
|
public static void Divide(
|
|
ref Quaternion quaternion1,
|
|
ref Quaternion quaternion2,
|
|
out Quaternion result
|
|
) {
|
|
float x = quaternion1.X;
|
|
float y = quaternion1.Y;
|
|
float z = quaternion1.Z;
|
|
float w = quaternion1.W;
|
|
float num14 = (
|
|
(quaternion2.X * quaternion2.X) +
|
|
(quaternion2.Y * quaternion2.Y) +
|
|
(quaternion2.Z * quaternion2.Z) +
|
|
(quaternion2.W * quaternion2.W)
|
|
);
|
|
float num5 = 1f / num14;
|
|
float num4 = -quaternion2.X * num5;
|
|
float num3 = -quaternion2.Y * num5;
|
|
float num2 = -quaternion2.Z * num5;
|
|
float num = quaternion2.W * num5;
|
|
float num13 = (y * num2) - (z * num3);
|
|
float num12 = (z * num4) - (x * num2);
|
|
float num11 = (x * num3) - (y * num4);
|
|
float num10 = ((x * num4) + (y * num3)) + (z * num2);
|
|
result.X = ((x * num) + (num4 * w)) + num13;
|
|
result.Y = ((y * num) + (num3 * w)) + num12;
|
|
result.Z = ((z * num) + (num2 * w)) + num11;
|
|
result.W = (w * num) - num10;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Returns a dot product of two quaternions.
|
|
/// </summary>
|
|
/// <param name="quaternion1">The first quaternion.</param>
|
|
/// <param name="quaternion2">The second quaternion.</param>
|
|
/// <returns>The dot product of two quaternions.</returns>
|
|
public static float Dot(Quaternion quaternion1, Quaternion quaternion2)
|
|
{
|
|
return (
|
|
(quaternion1.X * quaternion2.X) +
|
|
(quaternion1.Y * quaternion2.Y) +
|
|
(quaternion1.Z * quaternion2.Z) +
|
|
(quaternion1.W * quaternion2.W)
|
|
);
|
|
}
|
|
|
|
/// <summary>
|
|
/// Returns a dot product of two quaternions.
|
|
/// </summary>
|
|
/// <param name="quaternion1">The first quaternion.</param>
|
|
/// <param name="quaternion2">The second quaternion.</param>
|
|
/// <param name="result">The dot product of two quaternions as an output parameter.</param>
|
|
public static void Dot(
|
|
ref Quaternion quaternion1,
|
|
ref Quaternion quaternion2,
|
|
out float result
|
|
) {
|
|
result = (
|
|
(quaternion1.X * quaternion2.X) +
|
|
(quaternion1.Y * quaternion2.Y) +
|
|
(quaternion1.Z * quaternion2.Z) +
|
|
(quaternion1.W * quaternion2.W)
|
|
);
|
|
}
|
|
|
|
/// <summary>
|
|
/// Returns the inverse quaternion which represents the opposite rotation.
|
|
/// </summary>
|
|
/// <param name="quaternion">Source <see cref="Quaternion"/>.</param>
|
|
/// <returns>The inverse quaternion.</returns>
|
|
public static Quaternion Inverse(Quaternion quaternion)
|
|
{
|
|
Quaternion inverse;
|
|
Inverse(ref quaternion, out inverse);
|
|
return inverse;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Returns the inverse quaternion which represents the opposite rotation.
|
|
/// </summary>
|
|
/// <param name="quaternion">Source <see cref="Quaternion"/>.</param>
|
|
/// <param name="result">The inverse quaternion as an output parameter.</param>
|
|
public static void Inverse(ref Quaternion quaternion, out Quaternion result)
|
|
{
|
|
float num2 = (
|
|
(quaternion.X * quaternion.X) +
|
|
(quaternion.Y * quaternion.Y) +
|
|
(quaternion.Z * quaternion.Z) +
|
|
(quaternion.W * quaternion.W)
|
|
);
|
|
float num = 1f / num2;
|
|
result.X = -quaternion.X * num;
|
|
result.Y = -quaternion.Y * num;
|
|
result.Z = -quaternion.Z * num;
|
|
result.W = quaternion.W * num;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Performs a linear blend between two quaternions.
|
|
/// </summary>
|
|
/// <param name="quaternion1">Source <see cref="Quaternion"/>.</param>
|
|
/// <param name="quaternion2">Source <see cref="Quaternion"/>.</param>
|
|
/// <param name="amount">The blend amount where 0 returns <paramref name="quaternion1"/> and 1 <paramref name="quaternion2"/>.</param>
|
|
/// <returns>The result of linear blending between two quaternions.</returns>
|
|
public static Quaternion Lerp(
|
|
Quaternion quaternion1,
|
|
Quaternion quaternion2,
|
|
float amount
|
|
) {
|
|
Quaternion quaternion;
|
|
Lerp(ref quaternion1, ref quaternion2, amount, out quaternion);
|
|
return quaternion;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Performs a linear blend between two quaternions.
|
|
/// </summary>
|
|
/// <param name="quaternion1">Source <see cref="Quaternion"/>.</param>
|
|
/// <param name="quaternion2">Source <see cref="Quaternion"/>.</param>
|
|
/// <param name="amount">The blend amount where 0 returns <paramref name="quaternion1"/> and 1 <paramref name="quaternion2"/>.</param>
|
|
/// <param name="result">The result of linear blending between two quaternions as an output parameter.</param>
|
|
public static void Lerp(
|
|
ref Quaternion quaternion1,
|
|
ref Quaternion quaternion2,
|
|
float amount,
|
|
out Quaternion result
|
|
) {
|
|
float num = amount;
|
|
float num2 = 1f - num;
|
|
float num5 = (
|
|
(quaternion1.X * quaternion2.X) +
|
|
(quaternion1.Y * quaternion2.Y) +
|
|
(quaternion1.Z * quaternion2.Z) +
|
|
(quaternion1.W * quaternion2.W)
|
|
);
|
|
if (num5 >= 0f)
|
|
{
|
|
result.X = (num2 * quaternion1.X) + (num * quaternion2.X);
|
|
result.Y = (num2 * quaternion1.Y) + (num * quaternion2.Y);
|
|
result.Z = (num2 * quaternion1.Z) + (num * quaternion2.Z);
|
|
result.W = (num2 * quaternion1.W) + (num * quaternion2.W);
|
|
}
|
|
else
|
|
{
|
|
result.X = (num2 * quaternion1.X) - (num * quaternion2.X);
|
|
result.Y = (num2 * quaternion1.Y) - (num * quaternion2.Y);
|
|
result.Z = (num2 * quaternion1.Z) - (num * quaternion2.Z);
|
|
result.W = (num2 * quaternion1.W) - (num * quaternion2.W);
|
|
}
|
|
float num4 = (
|
|
(result.X * result.X) +
|
|
(result.Y * result.Y) +
|
|
(result.Z * result.Z) +
|
|
(result.W * result.W)
|
|
);
|
|
float num3 = 1f / ((float) System.Math.Sqrt((double) num4));
|
|
result.X *= num3;
|
|
result.Y *= num3;
|
|
result.Z *= num3;
|
|
result.W *= num3;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Performs a spherical linear blend between two quaternions.
|
|
/// </summary>
|
|
/// <param name="quaternion1">Source <see cref="Quaternion"/>.</param>
|
|
/// <param name="quaternion2">Source <see cref="Quaternion"/>.</param>
|
|
/// <param name="amount">The blend amount where 0 returns <paramref name="quaternion1"/> and 1 <paramref name="quaternion2"/>.</param>
|
|
/// <returns>The result of spherical linear blending between two quaternions.</returns>
|
|
public static Quaternion Slerp(
|
|
Quaternion quaternion1,
|
|
Quaternion quaternion2,
|
|
float amount
|
|
) {
|
|
Quaternion quaternion;
|
|
Slerp(ref quaternion1, ref quaternion2, amount, out quaternion);
|
|
return quaternion;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Performs a spherical linear blend between two quaternions.
|
|
/// </summary>
|
|
/// <param name="quaternion1">Source <see cref="Quaternion"/>.</param>
|
|
/// <param name="quaternion2">Source <see cref="Quaternion"/>.</param>
|
|
/// <param name="amount">The blend amount where 0 returns <paramref name="quaternion1"/> and 1 <paramref name="quaternion2"/>.</param>
|
|
/// <param name="result">The result of spherical linear blending between two quaternions as an output parameter.</param>
|
|
public static void Slerp(
|
|
ref Quaternion quaternion1,
|
|
ref Quaternion quaternion2,
|
|
float amount,
|
|
out Quaternion result
|
|
) {
|
|
float num2;
|
|
float num3;
|
|
float num = amount;
|
|
float num4 = (
|
|
(quaternion1.X * quaternion2.X) +
|
|
(quaternion1.Y * quaternion2.Y) +
|
|
(quaternion1.Z * quaternion2.Z) +
|
|
(quaternion1.W * quaternion2.W)
|
|
);
|
|
float flag = 1.0f;
|
|
if (num4 < 0f)
|
|
{
|
|
flag = -1.0f;
|
|
num4 = -num4;
|
|
}
|
|
if (num4 > 0.999999f)
|
|
{
|
|
num3 = 1f - num;
|
|
num2 = num * flag;
|
|
}
|
|
else
|
|
{
|
|
float num5 = (float) System.Math.Acos((double) num4);
|
|
float num6 = (float) (1.0 / System.Math.Sin((double) num5));
|
|
num3 = ((float) System.Math.Sin((double) ((1f - num) * num5))) * num6;
|
|
num2 = flag * (((float) System.Math.Sin((double) (num * num5))) * num6);
|
|
}
|
|
result.X = (num3 * quaternion1.X) + (num2 * quaternion2.X);
|
|
result.Y = (num3 * quaternion1.Y) + (num2 * quaternion2.Y);
|
|
result.Z = (num3 * quaternion1.Z) + (num2 * quaternion2.Z);
|
|
result.W = (num3 * quaternion1.W) + (num2 * quaternion2.W);
|
|
}
|
|
|
|
/// <summary>
|
|
/// Creates a new <see cref="Quaternion"/> that contains subtraction of one <see cref="Quaternion"/> from another.
|
|
/// </summary>
|
|
/// <param name="quaternion1">Source <see cref="Quaternion"/>.</param>
|
|
/// <param name="quaternion2">Source <see cref="Quaternion"/>.</param>
|
|
/// <returns>The result of the quaternion subtraction.</returns>
|
|
public static Quaternion Subtract(Quaternion quaternion1, Quaternion quaternion2)
|
|
{
|
|
Quaternion quaternion;
|
|
Subtract(ref quaternion1, ref quaternion2, out quaternion);
|
|
return quaternion;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Creates a new <see cref="Quaternion"/> that contains subtraction of one <see cref="Quaternion"/> from another.
|
|
/// </summary>
|
|
/// <param name="quaternion1">Source <see cref="Quaternion"/>.</param>
|
|
/// <param name="quaternion2">Source <see cref="Quaternion"/>.</param>
|
|
/// <param name="result">The result of the quaternion subtraction as an output parameter.</param>
|
|
public static void Subtract(
|
|
ref Quaternion quaternion1,
|
|
ref Quaternion quaternion2,
|
|
out Quaternion result
|
|
) {
|
|
result.X = quaternion1.X - quaternion2.X;
|
|
result.Y = quaternion1.Y - quaternion2.Y;
|
|
result.Z = quaternion1.Z - quaternion2.Z;
|
|
result.W = quaternion1.W - quaternion2.W;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Creates a new <see cref="Quaternion"/> that contains a multiplication of two quaternions.
|
|
/// </summary>
|
|
/// <param name="quaternion1">Source <see cref="Quaternion"/>.</param>
|
|
/// <param name="quaternion2">Source <see cref="Quaternion"/>.</param>
|
|
/// <returns>The result of the quaternion multiplication.</returns>
|
|
public static Quaternion Multiply(Quaternion quaternion1, Quaternion quaternion2)
|
|
{
|
|
Quaternion quaternion;
|
|
Multiply(ref quaternion1, ref quaternion2, out quaternion);
|
|
return quaternion;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Creates a new <see cref="Quaternion"/> that contains a multiplication of <see cref="Quaternion"/> and a scalar.
|
|
/// </summary>
|
|
/// <param name="quaternion1">Source <see cref="Quaternion"/>.</param>
|
|
/// <param name="scaleFactor">Scalar value.</param>
|
|
/// <returns>The result of the quaternion multiplication with a scalar.</returns>
|
|
public static Quaternion Multiply(Quaternion quaternion1, float scaleFactor)
|
|
{
|
|
Quaternion quaternion;
|
|
Multiply(ref quaternion1, scaleFactor, out quaternion);
|
|
return quaternion;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Creates a new <see cref="Quaternion"/> that contains a multiplication of two quaternions.
|
|
/// </summary>
|
|
/// <param name="quaternion1">Source <see cref="Quaternion"/>.</param>
|
|
/// <param name="quaternion2">Source <see cref="Quaternion"/>.</param>
|
|
/// <param name="result">The result of the quaternion multiplication as an output parameter.</param>
|
|
public static void Multiply(
|
|
ref Quaternion quaternion1,
|
|
ref Quaternion quaternion2,
|
|
out Quaternion result
|
|
) {
|
|
float x = quaternion1.X;
|
|
float y = quaternion1.Y;
|
|
float z = quaternion1.Z;
|
|
float w = quaternion1.W;
|
|
float num4 = quaternion2.X;
|
|
float num3 = quaternion2.Y;
|
|
float num2 = quaternion2.Z;
|
|
float num = quaternion2.W;
|
|
float num12 = (y * num2) - (z * num3);
|
|
float num11 = (z * num4) - (x * num2);
|
|
float num10 = (x * num3) - (y * num4);
|
|
float num9 = ((x * num4) + (y * num3)) + (z * num2);
|
|
result.X = ((x * num) + (num4 * w)) + num12;
|
|
result.Y = ((y * num) + (num3 * w)) + num11;
|
|
result.Z = ((z * num) + (num2 * w)) + num10;
|
|
result.W = (w * num) - num9;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Creates a new <see cref="Quaternion"/> that contains a multiplication of <see cref="Quaternion"/> and a scalar.
|
|
/// </summary>
|
|
/// <param name="quaternion1">Source <see cref="Quaternion"/>.</param>
|
|
/// <param name="scaleFactor">Scalar value.</param>
|
|
/// <param name="result">The result of the quaternion multiplication with a scalar as an output parameter.</param>
|
|
public static void Multiply(
|
|
ref Quaternion quaternion1,
|
|
float scaleFactor,
|
|
out Quaternion result
|
|
) {
|
|
result.X = quaternion1.X * scaleFactor;
|
|
result.Y = quaternion1.Y * scaleFactor;
|
|
result.Z = quaternion1.Z * scaleFactor;
|
|
result.W = quaternion1.W * scaleFactor;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Flips the sign of the all the quaternion components.
|
|
/// </summary>
|
|
/// <param name="quaternion">Source <see cref="Quaternion"/>.</param>
|
|
/// <returns>The result of the quaternion negation.</returns>
|
|
public static Quaternion Negate(Quaternion quaternion)
|
|
{
|
|
return new Quaternion(
|
|
-quaternion.X,
|
|
-quaternion.Y,
|
|
-quaternion.Z,
|
|
-quaternion.W
|
|
);
|
|
}
|
|
|
|
/// <summary>
|
|
/// Flips the sign of the all the quaternion components.
|
|
/// </summary>
|
|
/// <param name="quaternion">Source <see cref="Quaternion"/>.</param>
|
|
/// <param name="result">The result of the quaternion negation as an output parameter.</param>
|
|
public static void Negate(ref Quaternion quaternion, out Quaternion result)
|
|
{
|
|
result.X = -quaternion.X;
|
|
result.Y = -quaternion.Y;
|
|
result.Z = -quaternion.Z;
|
|
result.W = -quaternion.W;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Scales the quaternion magnitude to unit length.
|
|
/// </summary>
|
|
/// <param name="quaternion">Source <see cref="Quaternion"/>.</param>
|
|
/// <returns>The unit length quaternion.</returns>
|
|
public static Quaternion Normalize(Quaternion quaternion)
|
|
{
|
|
Quaternion quaternion2;
|
|
Normalize(ref quaternion, out quaternion2);
|
|
return quaternion2;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Scales the quaternion magnitude to unit length.
|
|
/// </summary>
|
|
/// <param name="quaternion">Source <see cref="Quaternion"/>.</param>
|
|
/// <param name="result">The unit length quaternion an output parameter.</param>
|
|
public static void Normalize(ref Quaternion quaternion, out Quaternion result)
|
|
{
|
|
float num = 1.0f / ((float) System.Math.Sqrt(
|
|
(quaternion.X * quaternion.X) +
|
|
(quaternion.Y * quaternion.Y) +
|
|
(quaternion.Z * quaternion.Z) +
|
|
(quaternion.W * quaternion.W)
|
|
));
|
|
result.X = quaternion.X * num;
|
|
result.Y = quaternion.Y * num;
|
|
result.Z = quaternion.Z * num;
|
|
result.W = quaternion.W * num;
|
|
}
|
|
|
|
#endregion
|
|
|
|
#region Public Static Operator Overloads
|
|
|
|
/// <summary>
|
|
/// Adds two quaternions.
|
|
/// </summary>
|
|
/// <param name="quaternion1">Source <see cref="Quaternion"/> on the left of the add sign.</param>
|
|
/// <param name="quaternion2">Source <see cref="Quaternion"/> on the right of the add sign.</param>
|
|
/// <returns>Sum of the vectors.</returns>
|
|
public static Quaternion operator +(Quaternion quaternion1, Quaternion quaternion2)
|
|
{
|
|
Quaternion quaternion;
|
|
Add(ref quaternion1, ref quaternion2, out quaternion);
|
|
return quaternion;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Divides a <see cref="Quaternion"/> by the other <see cref="Quaternion"/>.
|
|
/// </summary>
|
|
/// <param name="quaternion1">Source <see cref="Quaternion"/> on the left of the div sign.</param>
|
|
/// <param name="quaternion2">Divisor <see cref="Quaternion"/> on the right of the div sign.</param>
|
|
/// <returns>The result of dividing the quaternions.</returns>
|
|
public static Quaternion operator /(Quaternion quaternion1, Quaternion quaternion2)
|
|
{
|
|
Quaternion quaternion;
|
|
Divide(ref quaternion1, ref quaternion2, out quaternion);
|
|
return quaternion;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Compares whether two <see cref="Quaternion"/> instances are equal.
|
|
/// </summary>
|
|
/// <param name="quaternion1"><see cref="Quaternion"/> instance on the left of the equal sign.</param>
|
|
/// <param name="quaternion2"><see cref="Quaternion"/> instance on the right of the equal sign.</param>
|
|
/// <returns><c>true</c> if the instances are equal; <c>false</c> otherwise.</returns>
|
|
public static bool operator ==(Quaternion quaternion1, Quaternion quaternion2)
|
|
{
|
|
return quaternion1.Equals(quaternion2);
|
|
}
|
|
|
|
/// <summary>
|
|
/// Compares whether two <see cref="Quaternion"/> instances are not equal.
|
|
/// </summary>
|
|
/// <param name="quaternion1"><see cref="Quaternion"/> instance on the left of the not equal sign.</param>
|
|
/// <param name="quaternion2"><see cref="Quaternion"/> instance on the right of the not equal sign.</param>
|
|
/// <returns><c>true</c> if the instances are not equal; <c>false</c> otherwise.</returns>
|
|
public static bool operator !=(Quaternion quaternion1, Quaternion quaternion2)
|
|
{
|
|
return !quaternion1.Equals(quaternion2);
|
|
}
|
|
|
|
/// <summary>
|
|
/// Multiplies two quaternions.
|
|
/// </summary>
|
|
/// <param name="quaternion1">Source <see cref="Quaternion"/> on the left of the mul sign.</param>
|
|
/// <param name="quaternion2">Source <see cref="Quaternion"/> on the right of the mul sign.</param>
|
|
/// <returns>Result of the quaternions multiplication.</returns>
|
|
public static Quaternion operator *(Quaternion quaternion1, Quaternion quaternion2)
|
|
{
|
|
Quaternion quaternion;
|
|
Multiply(ref quaternion1, ref quaternion2, out quaternion);
|
|
return quaternion;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Multiplies the components of quaternion by a scalar.
|
|
/// </summary>
|
|
/// <param name="quaternion1">Source <see cref="Vector3"/> on the left of the mul sign.</param>
|
|
/// <param name="scaleFactor">Scalar value on the right of the mul sign.</param>
|
|
/// <returns>Result of the quaternion multiplication with a scalar.</returns>
|
|
public static Quaternion operator *(Quaternion quaternion1, float scaleFactor)
|
|
{
|
|
Quaternion quaternion;
|
|
Multiply(ref quaternion1, scaleFactor, out quaternion);
|
|
return quaternion;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Subtracts a <see cref="Quaternion"/> from a <see cref="Quaternion"/>.
|
|
/// </summary>
|
|
/// <param name="quaternion1">Source <see cref="Vector3"/> on the left of the sub sign.</param>
|
|
/// <param name="quaternion2">Source <see cref="Vector3"/> on the right of the sub sign.</param>
|
|
/// <returns>Result of the quaternion subtraction.</returns>
|
|
public static Quaternion operator -(Quaternion quaternion1, Quaternion quaternion2)
|
|
{
|
|
Quaternion quaternion;
|
|
Subtract(ref quaternion1, ref quaternion2, out quaternion);
|
|
return quaternion;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Flips the sign of the all the quaternion components.
|
|
/// </summary>
|
|
/// <param name="quaternion">Source <see cref="Quaternion"/> on the right of the sub sign.</param>
|
|
/// <returns>The result of the quaternion negation.</returns>
|
|
public static Quaternion operator -(Quaternion quaternion)
|
|
{
|
|
Quaternion quaternion2;
|
|
Negate(ref quaternion, out quaternion2);
|
|
return quaternion2;
|
|
}
|
|
|
|
#endregion
|
|
}
|
|
}
|