using System;
using System.Runtime.CompilerServices;
using Unity.IL2CPP.CompilerServices;
using static Unity.Mathematics.math;
namespace Unity.Mathematics
{
/// <summary>
/// A quaternion type for representing rotations.
/// </summary>
[Il2CppEagerStaticClassConstruction]
[Serializable]
public partial struct quaternion : System.IEquatable<quaternion>, IFormattable
{
/// <summary>
/// The quaternion component values.
/// </summary>
public float4 value;
/// <summary>A quaternion representing the identity transform.</summary>
public static readonly quaternion identity = new quaternion(0.0f, 0.0f, 0.0f, 1.0f);
/// <summary>Constructs a quaternion from four float values.</summary>
/// <param name="x">The quaternion x component.</param>
/// <param name="y">The quaternion y component.</param>
/// <param name="z">The quaternion z component.</param>
/// <param name="w">The quaternion w component.</param>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public quaternion(float x, float y, float z, float w) { value.x = x; value.y = y; value.z = z; value.w = w; }
/// <summary>Constructs a quaternion from float4 vector.</summary>
/// <param name="value">The quaternion xyzw component values.</param>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public quaternion(float4 value) { this.value = value; }
/// <summary>Implicitly converts a float4 vector to a quaternion.</summary>
/// <param name="v">The quaternion xyzw component values.</param>
/// <returns>The quaternion constructed from a float4 vector.</returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static implicit operator quaternion(float4 v) { return new quaternion(v); }
/// <summary>Constructs a unit quaternion from a float3x3 rotation matrix. The matrix must be orthonormal.</summary>
/// <param name="m">The float3x3 orthonormal rotation matrix.</param>
public quaternion(float3x3 m)
{
float3 u = m.c0;
float3 v = m.c1;
float3 w = m.c2;
uint u_sign = (asuint(u.x) & 0x80000000);
float t = v.y + asfloat(asuint(w.z) ^ u_sign);
uint4 u_mask = uint4((int)u_sign >> 31);
uint4 t_mask = uint4(asint(t) >> 31);
float tr = 1.0f + abs(u.x);
uint4 sign_flips = uint4(0x00000000, 0x80000000, 0x80000000, 0x80000000) ^ (u_mask & uint4(0x00000000, 0x80000000, 0x00000000, 0x80000000)) ^ (t_mask & uint4(0x80000000, 0x80000000, 0x80000000, 0x00000000));
value = float4(tr, u.y, w.x, v.z) + asfloat(asuint(float4(t, v.x, u.z, w.y)) ^ sign_flips); // +---, +++-, ++-+, +-++
value = asfloat((asuint(value) & ~u_mask) | (asuint(value.zwxy) & u_mask));
value = asfloat((asuint(value.wzyx) & ~t_mask) | (asuint(value) & t_mask));
value = normalize(value);
}
/// <summary>Constructs a unit quaternion from an orthonormal float4x4 matrix.</summary>
/// <param name="m">The float4x4 orthonormal rotation matrix.</param>
public quaternion(float4x4 m)
{
float4 u = m.c0;
float4 v = m.c1;
float4 w = m.c2;
uint u_sign = (asuint(u.x) & 0x80000000);
float t = v.y + asfloat(asuint(w.z) ^ u_sign);
uint4 u_mask = uint4((int)u_sign >> 31);
uint4 t_mask = uint4(asint(t) >> 31);
float tr = 1.0f + abs(u.x);
uint4 sign_flips = uint4(0x00000000, 0x80000000, 0x80000000, 0x80000000) ^ (u_mask & uint4(0x00000000, 0x80000000, 0x00000000, 0x80000000)) ^ (t_mask & uint4(0x80000000, 0x80000000, 0x80000000, 0x00000000));
value = float4(tr, u.y, w.x, v.z) + asfloat(asuint(float4(t, v.x, u.z, w.y)) ^ sign_flips); // +---, +++-, ++-+, +-++
value = asfloat((asuint(value) & ~u_mask) | (asuint(value.zwxy) & u_mask));
value = asfloat((asuint(value.wzyx) & ~t_mask) | (asuint(value) & t_mask));
value = normalize(value);
}
/// <summary>
/// Returns a quaternion representing a rotation around a unit axis by an angle in radians.
/// The rotation direction is clockwise when looking along the rotation axis towards the origin.
/// </summary>
/// <param name="axis">The axis of rotation.</param>
/// <param name="angle">The angle of rotation in radians.</param>
/// <returns>The quaternion representing a rotation around an axis.</returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static quaternion AxisAngle(float3 axis, float angle)
{
float sina, cosa;
math.sincos(0.5f * angle, out sina, out cosa);
return quaternion(float4(axis * sina, cosa));
}
/// <summary>
/// Returns a quaternion constructed by first performing a rotation around the x-axis, then the y-axis and finally the z-axis.
/// All rotation angles are in radians and clockwise when looking along the rotation axis towards the origin.
/// </summary>
/// <param name="xyz">A float3 vector containing the rotation angles around the x-, y- and z-axis measures in radians.</param>
/// <returns>The quaternion representing the Euler angle rotation in x-y-z order.</returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static quaternion EulerXYZ(float3 xyz)
{
// return mul(rotateZ(xyz.z), mul(rotateY(xyz.y), rotateX(xyz.x)));
float3 s, c;
sincos(0.5f * xyz, out s, out c);
return quaternion(
// s.x * c.y * c.z - s.y * s.z * c.x,
// s.y * c.x * c.z + s.x * s.z * c.y,
// s.z * c.x * c.y - s.x * s.y * c.z,
// c.x * c.y * c.z + s.y * s.z * s.x
float4(s.xyz, c.x) * c.yxxy * c.zzyz + s.yxxy * s.zzyz * float4(c.xyz, s.x) * float4(-1.0f, 1.0f, -1.0f, 1.0f)
);
}
/// <summary>
/// Returns a quaternion constructed by first performing a rotation around the x-axis, then the z-axis and finally the y-axis.
/// All rotation angles are in radians and clockwise when looking along the rotation axis towards the origin.
/// </summary>
/// <param name="xyz">A float3 vector containing the rotation angles around the x-, y- and z-axis measures in radians.</param>
/// <returns>The quaternion representing the Euler angle rotation in x-z-y order.</returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static quaternion EulerXZY(float3 xyz)
{
// return mul(rotateY(xyz.y), mul(rotateZ(xyz.z), rotateX(xyz.x)));
float3 s, c;
sincos(0.5f * xyz, out s, out c);
return quaternion(
// s.x * c.y * c.z + s.y * s.z * c.x,
// s.y * c.x * c.z + s.x * s.z * c.y,
// s.z * c.x * c.y - s.x * s.y * c.z,
// c.x * c.y * c.z - s.y * s.z * s.x
float4(s.xyz, c.x) * c.yxxy * c.zzyz + s.yxxy * s.zzyz * float4(c.xyz, s.x) * float4(1.0f, 1.0f, -1.0f, -1.0f)
);
}
/// <summary>
/// Returns a quaternion constructed by first performing a rotation around the y-axis, then the x-axis and finally the z-axis.
/// All rotation angles are in radians and clockwise when looking along the rotation axis towards the origin.
/// </summary>
/// <param name="xyz">A float3 vector containing the rotation angles around the x-, y- and z-axis measures in radians.</param>
/// <returns>The quaternion representing the Euler angle rotation in y-x-z order.</returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static quaternion EulerYXZ(float3 xyz)
{
// return mul(rotateZ(xyz.z), mul(rotateX(xyz.x), rotateY(xyz.y)));
float3 s, c;
sincos(0.5f * xyz, out s, out c);
return quaternion(
// s.x * c.y * c.z - s.y * s.z * c.x,
// s.y * c.x * c.z + s.x * s.z * c.y,
// s.z * c.x * c.y + s.x * s.y * c.z,
// c.x * c.y * c.z - s.y * s.z * s.x
float4(s.xyz, c.x) * c.yxxy * c.zzyz + s.yxxy * s.zzyz * float4(c.xyz, s.x) * float4(-1.0f, 1.0f, 1.0f, -1.0f)
);
}
/// <summary>
/// Returns a quaternion constructed by first performing a rotation around the y-axis, then the z-axis and finally the x-axis.
/// All rotation angles are in radians and clockwise when looking along the rotation axis towards the origin.
/// </summary>
/// <param name="xyz">A float3 vector containing the rotation angles around the x-, y- and z-axis measures in radians.</param>
/// <returns>The quaternion representing the Euler angle rotation in y-z-x order.</returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static quaternion EulerYZX(float3 xyz)
{
// return mul(rotateX(xyz.x), mul(rotateZ(xyz.z), rotateY(xyz.y)));
float3 s, c;
sincos(0.5f * xyz, out s, out c);
return quaternion(
// s.x * c.y * c.z - s.y * s.z * c.x,
// s.y * c.x * c.z - s.x * s.z * c.y,
// s.z * c.x * c.y + s.x * s.y * c.z,
// c.x * c.y * c.z + s.y * s.z * s.x
float4(s.xyz, c.x) * c.yxxy * c.zzyz + s.yxxy * s.zzyz * float4(c.xyz, s.x) * float4(-1.0f, -1.0f, 1.0f, 1.0f)
);
}
/// <summary>
/// Returns a quaternion constructed by first performing a rotation around the z-axis, then the x-axis and finally the y-axis.
/// All rotation angles are in radians and clockwise when looking along the rotation axis towards the origin.
/// This is the default order rotation order in Unity.
/// </summary>
/// <param name="xyz">A float3 vector containing the rotation angles around the x-, y- and z-axis measures in radians.</param>
/// <returns>The quaternion representing the Euler angle rotation in z-x-y order.</returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static quaternion EulerZXY(float3 xyz)
{
// return mul(rotateY(xyz.y), mul(rotateX(xyz.x), rotateZ(xyz.z)));
float3 s, c;
sincos(0.5f * xyz, out s, out c);
return quaternion(
// s.x * c.y * c.z + s.y * s.z * c.x,
// s.y * c.x * c.z - s.x * s.z * c.y,
// s.z * c.x * c.y - s.x * s.y * c.z,
// c.x * c.y * c.z + s.y * s.z * s.x
float4(s.xyz, c.x) * c.yxxy * c.zzyz + s.yxxy * s.zzyz * float4(c.xyz, s.x) * float4(1.0f, -1.0f, -1.0f, 1.0f)
);
}
/// <summary>
/// Returns a quaternion constructed by first performing a rotation around the z-axis, then the y-axis and finally the x-axis.
/// All rotation angles are in radians and clockwise when looking along the rotation axis towards the origin.
/// </summary>
/// <param name="xyz">A float3 vector containing the rotation angles around the x-, y- and z-axis measures in radians.</param>
/// <returns>The quaternion representing the Euler angle rotation in z-y-x order.</returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static quaternion EulerZYX(float3 xyz)
{
// return mul(rotateX(xyz.x), mul(rotateY(xyz.y), rotateZ(xyz.z)));
float3 s, c;
sincos(0.5f * xyz, out s, out c);
return quaternion(
// s.x * c.y * c.z + s.y * s.z * c.x,
// s.y * c.x * c.z - s.x * s.z * c.y,
// s.z * c.x * c.y + s.x * s.y * c.z,
// c.x * c.y * c.z - s.y * s.x * s.z
float4(s.xyz, c.x) * c.yxxy * c.zzyz + s.yxxy * s.zzyz * float4(c.xyz, s.x) * float4(1.0f, -1.0f, 1.0f, -1.0f)
);
}
/// <summary>
/// Returns a quaternion constructed by first performing a rotation around the x-axis, then the y-axis and finally the z-axis.
/// All rotation angles are in radians and clockwise when looking along the rotation axis towards the origin.
/// </summary>
/// <param name="x">The rotation angle around the x-axis in radians.</param>
/// <param name="y">The rotation angle around the y-axis in radians.</param>
/// <param name="z">The rotation angle around the z-axis in radians.</param>
/// <returns>The quaternion representing the Euler angle rotation in x-y-z order.</returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static quaternion EulerXYZ(float x, float y, float z) { return EulerXYZ(float3(x, y, z)); }
/// <summary>
/// Returns a quaternion constructed by first performing a rotation around the x-axis, then the z-axis and finally the y-axis.
/// All rotation angles are in radians and clockwise when looking along the rotation axis towards the origin.
/// </summary>
/// <param name="x">The rotation angle around the x-axis in radians.</param>
/// <param name="y">The rotation angle around the y-axis in radians.</param>
/// <param name="z">The rotation angle around the z-axis in radians.</param>
/// <returns>The quaternion representing the Euler angle rotation in x-z-y order.</returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static quaternion EulerXZY(float x, float y, float z) { return EulerXZY(float3(x, y, z)); }
/// <summary>
/// Returns a quaternion constructed by first performing a rotation around the y-axis, then the x-axis and finally the z-axis.
/// All rotation angles are in radians and clockwise when looking along the rotation axis towards the origin.
/// </summary>
/// <param name="x">The rotation angle around the x-axis in radians.</param>
/// <param name="y">The rotation angle around the y-axis in radians.</param>
/// <param name="z">The rotation angle around the z-axis in radians.</param>
/// <returns>The quaternion representing the Euler angle rotation in y-x-z order.</returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static quaternion EulerYXZ(float x, float y, float z) { return EulerYXZ(float3(x, y, z)); }
/// <summary>
/// Returns a quaternion constructed by first performing a rotation around the y-axis, then the z-axis and finally the x-axis.
/// All rotation angles are in radians and clockwise when looking along the rotation axis towards the origin.
/// </summary>
/// <param name="x">The rotation angle around the x-axis in radians.</param>
/// <param name="y">The rotation angle around the y-axis in radians.</param>
/// <param name="z">The rotation angle around the z-axis in radians.</param>
/// <returns>The quaternion representing the Euler angle rotation in y-z-x order.</returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static quaternion EulerYZX(float x, float y, float z) { return EulerYZX(float3(x, y, z)); }
/// <summary>
/// Returns a quaternion constructed by first performing a rotation around the z-axis, then the x-axis and finally the y-axis.
/// All rotation angles are in radians and clockwise when looking along the rotation axis towards the origin.
/// This is the default order rotation order in Unity.
/// </summary>
/// <param name="x">The rotation angle around the x-axis in radians.</param>
/// <param name="y">The rotation angle around the y-axis in radians.</param>
/// <param name="z">The rotation angle around the z-axis in radians.</param>
/// <returns>The quaternion representing the Euler angle rotation in z-x-y order.</returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static quaternion EulerZXY(float x, float y, float z) { return EulerZXY(float3(x, y, z)); }
/// <summary>
/// Returns a quaternion constructed by first performing a rotation around the z-axis, then the y-axis and finally the x-axis.
/// All rotation angles are in radians and clockwise when looking along the rotation axis towards the origin.
/// </summary>
/// <param name="x">The rotation angle around the x-axis in radians.</param>
/// <param name="y">The rotation angle around the y-axis in radians.</param>
/// <param name="z">The rotation angle around the z-axis in radians.</param>
/// <returns>The quaternion representing the Euler angle rotation in z-y-x order.</returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static quaternion EulerZYX(float x, float y, float z) { return EulerZYX(float3(x, y, z)); }
/// <summary>
/// Returns a quaternion constructed by first performing 3 rotations around the principal axes in a given order.
/// All rotation angles are in radians and clockwise when looking along the rotation axis towards the origin.
/// When the rotation order is known at compile time, it is recommended for performance reasons to use specific
/// Euler rotation constructors such as EulerZXY(...).
/// </summary>
/// <param name="xyz">A float3 vector containing the rotation angles around the x-, y- and z-axis measures in radians.</param>
/// <param name="order">The order in which the rotations are applied.</param>
/// <returns>The quaternion representing the Euler angle rotation in the specified order.</returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static quaternion Euler(float3 xyz, RotationOrder order = RotationOrder.ZXY)
{
switch (order)
{
case RotationOrder.XYZ:
return EulerXYZ(xyz);
case RotationOrder.XZY:
return EulerXZY(xyz);
case RotationOrder.YXZ:
return EulerYXZ(xyz);
case RotationOrder.YZX:
return EulerYZX(xyz);
case RotationOrder.ZXY:
return EulerZXY(xyz);
case RotationOrder.ZYX:
return EulerZYX(xyz);
default:
return quaternion.identity;
}
}
/// <summary>
/// Returns a quaternion constructed by first performing 3 rotations around the principal axes in a given order.
/// All rotation angles are in radians and clockwise when looking along the rotation axis towards the origin.
/// When the rotation order is known at compile time, it is recommended for performance reasons to use specific
/// Euler rotation constructors such as EulerZXY(...).
/// </summary>
/// <param name="x">The rotation angle around the x-axis in radians.</param>
/// <param name="y">The rotation angle around the y-axis in radians.</param>
/// <param name="z">The rotation angle around the z-axis in radians.</param>
/// <param name="order">The order in which the rotations are applied.</param>
/// <returns>The quaternion representing the Euler angle rotation in the specified order.</returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static quaternion Euler(float x, float y, float z, RotationOrder order = RotationOrder.Default)
{
return Euler(float3(x, y, z), order);
}
/// <summary>Returns a quaternion that rotates around the x-axis by a given number of radians.</summary>
/// <param name="angle">The clockwise rotation angle when looking along the x-axis towards the origin in radians.</param>
/// <returns>The quaternion representing a rotation around the x-axis.</returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static quaternion RotateX(float angle)
{
float sina, cosa;
math.sincos(0.5f * angle, out sina, out cosa);
return quaternion(sina, 0.0f, 0.0f, cosa);
}
/// <summary>Returns a quaternion that rotates around the y-axis by a given number of radians.</summary>
/// <param name="angle">The clockwise rotation angle when looking along the y-axis towards the origin in radians.</param>
/// <returns>The quaternion representing a rotation around the y-axis.</returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static quaternion RotateY(float angle)
{
float sina, cosa;
math.sincos(0.5f * angle, out sina, out cosa);
return quaternion(0.0f, sina, 0.0f, cosa);
}
/// <summary>Returns a quaternion that rotates around the z-axis by a given number of radians.</summary>
/// <param name="angle">The clockwise rotation angle when looking along the z-axis towards the origin in radians.</param>
/// <returns>The quaternion representing a rotation around the z-axis.</returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static quaternion RotateZ(float angle)
{
float sina, cosa;
math.sincos(0.5f * angle, out sina, out cosa);
return quaternion(0.0f, 0.0f, sina, cosa);
}
/// <summary>
/// Returns a quaternion view rotation given a unit length forward vector and a unit length up vector.
/// The two input vectors are assumed to be unit length and not collinear.
/// If these assumptions are not met use float3x3.LookRotationSafe instead.
/// </summary>
/// <param name="forward">The view forward direction.</param>
/// <param name="up">The view up direction.</param>
/// <returns>The quaternion view rotation.</returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static quaternion LookRotation(float3 forward, float3 up)
{
float3 t = normalize(cross(up, forward));
return quaternion(float3x3(t, cross(forward, t), forward));
}
/// <summary>
/// Returns a quaternion view rotation given a forward vector and an up vector.
/// The two input vectors are not assumed to be unit length.
/// If the magnitude of either of the vectors is so extreme that the calculation cannot be carried out reliably or the vectors are collinear,
/// the identity will be returned instead.
/// </summary>
/// <param name="forward">The view forward direction.</param>
/// <param name="up">The view up direction.</param>
/// <returns>The quaternion view rotation or the identity quaternion.</returns>
public static quaternion LookRotationSafe(float3 forward, float3 up)
{
float forwardLengthSq = dot(forward, forward);
float upLengthSq = dot(up, up);
forward *= rsqrt(forwardLengthSq);
up *= rsqrt(upLengthSq);
float3 t = cross(up, forward);
float tLengthSq = dot(t, t);
t *= rsqrt(tLengthSq);
float mn = min(min(forwardLengthSq, upLengthSq), tLengthSq);
float mx = max(max(forwardLengthSq, upLengthSq), tLengthSq);
bool accept = mn > 1e-35f && mx < 1e35f && isfinite(forwardLengthSq) && isfinite(upLengthSq) && isfinite(tLengthSq);
return quaternion(select(float4(0.0f, 0.0f, 0.0f, 1.0f), quaternion(float3x3(t, cross(forward, t),forward)).value, accept));
}
/// <summary>Returns true if the quaternion is equal to a given quaternion, false otherwise.</summary>
/// <param name="x">The quaternion to compare with.</param>
/// <returns>True if the quaternion is equal to the input, false otherwise.</returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public bool Equals(quaternion x) { return value.x == x.value.x && value.y == x.value.y && value.z == x.value.z && value.w == x.value.w; }
/// <summary>Returns whether true if the quaternion is equal to a given quaternion, false otherwise.</summary>
/// <param name="x">The object to compare with.</param>
/// <returns>True if the quaternion is equal to the input, false otherwise.</returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public override bool Equals(object x) { return x is quaternion converted && Equals(converted); }
/// <summary>Returns a hash code for the quaternion.</summary>
/// <returns>The hash code of the quaternion.</returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public override int GetHashCode() { return (int)math.hash(this); }
/// <summary>Returns a string representation of the quaternion.</summary>
/// <returns>The string representation of the quaternion.</returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public override string ToString()
{
return string.Format("quaternion({0}f, {1}f, {2}f, {3}f)", value.x, value.y, value.z, value.w);
}
/// <summary>Returns a string representation of the quaternion using a specified format and culture-specific format information.</summary>
/// <param name="format">The format string.</param>
/// <param name="formatProvider">The format provider to use during string formatting.</param>
/// <returns>The formatted string representation of the quaternion.</returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public string ToString(string format, IFormatProvider formatProvider)
{
return string.Format("quaternion({0}f, {1}f, {2}f, {3}f)", value.x.ToString(format, formatProvider), value.y.ToString(format, formatProvider), value.z.ToString(format, formatProvider), value.w.ToString(format, formatProvider));
}
}
public static partial class math
{
/// <summary>Returns a quaternion constructed from four float values.</summary>
/// <param name="x">The x component of the quaternion.</param>
/// <param name="y">The y component of the quaternion.</param>
/// <param name="z">The z component of the quaternion.</param>
/// <param name="w">The w component of the quaternion.</param>
/// <returns>The quaternion constructed from individual components.</returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static quaternion quaternion(float x, float y, float z, float w) { return new quaternion(x, y, z, w); }
/// <summary>Returns a quaternion constructed from a float4 vector.</summary>
/// <param name="value">The float4 containing the components of the quaternion.</param>
/// <returns>The quaternion constructed from a float4.</returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static quaternion quaternion(float4 value) { return new quaternion(value); }
/// <summary>Returns a unit quaternion constructed from a float3x3 rotation matrix. The matrix must be orthonormal.</summary>
/// <param name="m">The float3x3 rotation matrix.</param>
/// <returns>The quaternion constructed from a float3x3 matrix.</returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static quaternion quaternion(float3x3 m) { return new quaternion(m); }
/// <summary>Returns a unit quaternion constructed from a float4x4 matrix. The matrix must be orthonormal.</summary>
/// <param name="m">The float4x4 matrix (must be orthonormal).</param>
/// <returns>The quaternion constructed from a float4x4 matrix.</returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static quaternion quaternion(float4x4 m) { return new quaternion(m); }
/// <summary>Returns the conjugate of a quaternion value.</summary>
/// <param name="q">The quaternion to conjugate.</param>
/// <returns>The conjugate of the input quaternion.</returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static quaternion conjugate(quaternion q)
{
return quaternion(q.value * float4(-1.0f, -1.0f, -1.0f, 1.0f));
}
/// <summary>Returns the inverse of a quaternion value.</summary>
/// <param name="q">The quaternion to invert.</param>
/// <returns>The quaternion inverse of the input quaternion.</returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static quaternion inverse(quaternion q)
{
float4 x = q.value;
return quaternion(rcp(dot(x, x)) * x * float4(-1.0f, -1.0f, -1.0f, 1.0f));
}
/// <summary>Returns the dot product of two quaternions.</summary>
/// <param name="a">The first quaternion.</param>
/// <param name="b">The second quaternion.</param>
/// <returns>The dot product of two quaternions.</returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static float dot(quaternion a, quaternion b)
{
return dot(a.value, b.value);
}
/// <summary>Returns the length of a quaternion.</summary>
/// <param name="q">The input quaternion.</param>
/// <returns>The length of the input quaternion.</returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static float length(quaternion q)
{
return sqrt(dot(q.value, q.value));
}
/// <summary>Returns the squared length of a quaternion.</summary>
/// <param name="q">The input quaternion.</param>
/// <returns>The length squared of the input quaternion.</returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static float lengthsq(quaternion q)
{
return dot(q.value, q.value);
}
/// <summary>Returns a normalized version of a quaternion q by scaling it by 1 / length(q).</summary>
/// <param name="q">The quaternion to normalize.</param>
/// <returns>The normalized quaternion.</returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static quaternion normalize(quaternion q)
{
float4 x = q.value;
return quaternion(rsqrt(dot(x, x)) * x);
}
/// <summary>
/// Returns a safe normalized version of the q by scaling it by 1 / length(q).
/// Returns the identity when 1 / length(q) does not produce a finite number.
/// </summary>
/// <param name="q">The quaternion to normalize.</param>
/// <returns>The normalized quaternion or the identity quaternion.</returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static quaternion normalizesafe(quaternion q)
{
float4 x = q.value;
float len = math.dot(x, x);
return quaternion(math.select(Mathematics.quaternion.identity.value, x * math.rsqrt(len), len > FLT_MIN_NORMAL));
}
/// <summary>
/// Returns a safe normalized version of the q by scaling it by 1 / length(q).
/// Returns the given default value when 1 / length(q) does not produce a finite number.
/// </summary>
/// <param name="q">The quaternion to normalize.</param>
/// <param name="defaultvalue">The default value.</param>
/// <returns>The normalized quaternion or the default value.</returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static quaternion normalizesafe(quaternion q, quaternion defaultvalue)
{
float4 x = q.value;
float len = math.dot(x, x);
return quaternion(math.select(defaultvalue.value, x * math.rsqrt(len), len > FLT_MIN_NORMAL));
}
/// <summary>Returns the natural exponent of a quaternion. Assumes w is zero.</summary>
/// <param name="q">The quaternion with w component equal to zero.</param>
/// <returns>The natural exponent of the input quaternion.</returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static quaternion unitexp(quaternion q)
{
float v_rcp_len = rsqrt(dot(q.value.xyz, q.value.xyz));
float v_len = rcp(v_rcp_len);
float sin_v_len, cos_v_len;
sincos(v_len, out sin_v_len, out cos_v_len);
return quaternion(float4(q.value.xyz * v_rcp_len * sin_v_len, cos_v_len));
}
/// <summary>Returns the natural exponent of a quaternion.</summary>
/// <param name="q">The quaternion.</param>
/// <returns>The natural exponent of the input quaternion.</returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static quaternion exp(quaternion q)
{
float v_rcp_len = rsqrt(dot(q.value.xyz, q.value.xyz));
float v_len = rcp(v_rcp_len);
float sin_v_len, cos_v_len;
sincos(v_len, out sin_v_len, out cos_v_len);
return quaternion(float4(q.value.xyz * v_rcp_len * sin_v_len, cos_v_len) * exp(q.value.w));
}
/// <summary>Returns the natural logarithm of a unit length quaternion.</summary>
/// <param name="q">The unit length quaternion.</param>
/// <returns>The natural logarithm of the unit length quaternion.</returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static quaternion unitlog(quaternion q)
{
float w = clamp(q.value.w, -1.0f, 1.0f);
float s = acos(w) * rsqrt(1.0f - w*w);
return quaternion(float4(q.value.xyz * s, 0.0f));
}
/// <summary>Returns the natural logarithm of a quaternion.</summary>
/// <param name="q">The quaternion.</param>
/// <returns>The natural logarithm of the input quaternion.</returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static quaternion log(quaternion q)
{
float v_len_sq = dot(q.value.xyz, q.value.xyz);
float q_len_sq = v_len_sq + q.value.w*q.value.w;
float s = acos(clamp(q.value.w * rsqrt(q_len_sq), -1.0f, 1.0f)) * rsqrt(v_len_sq);
return quaternion(float4(q.value.xyz * s, 0.5f * log(q_len_sq)));
}
/// <summary>Returns the result of transforming the quaternion b by the quaternion a.</summary>
/// <param name="a">The quaternion on the left.</param>
/// <param name="b">The quaternion on the right.</param>
/// <returns>The result of transforming quaternion b by the quaternion a.</returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static quaternion mul(quaternion a, quaternion b)
{
return quaternion(a.value.wwww * b.value + (a.value.xyzx * b.value.wwwx + a.value.yzxy * b.value.zxyy) * float4(1.0f, 1.0f, 1.0f, -1.0f) - a.value.zxyz * b.value.yzxz);
}
/// <summary>Returns the result of transforming a vector by a quaternion.</summary>
/// <param name="q">The quaternion transformation.</param>
/// <param name="v">The vector to transform.</param>
/// <returns>The transformation of vector v by quaternion q.</returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static float3 mul(quaternion q, float3 v)
{
float3 t = 2 * cross(q.value.xyz, v);
return v + q.value.w * t + cross(q.value.xyz, t);
}
/// <summary>Returns the result of rotating a vector by a unit quaternion.</summary>
/// <param name="q">The quaternion rotation.</param>
/// <param name="v">The vector to rotate.</param>
/// <returns>The rotation of vector v by quaternion q.</returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static float3 rotate(quaternion q, float3 v)
{
float3 t = 2 * cross(q.value.xyz, v);
return v + q.value.w * t + cross(q.value.xyz, t);
}
/// <summary>Returns the result of a normalized linear interpolation between two quaternions q1 and a2 using an interpolation parameter t.</summary>
/// <remarks>
/// Prefer to use this over slerp() when you know the distance between q1 and q2 is small. This can be much
/// higher performance due to avoiding trigonometric function evaluations that occur in slerp().
/// </remarks>
/// <param name="q1">The first quaternion.</param>
/// <param name="q2">The second quaternion.</param>
/// <param name="t">The interpolation parameter.</param>
/// <returns>The normalized linear interpolation of two quaternions.</returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static quaternion nlerp(quaternion q1, quaternion q2, float t)
{
float dt = dot(q1, q2);
if(dt < 0.0f)
{
q2.value = -q2.value;
}
return normalize(quaternion(lerp(q1.value, q2.value, t)));
}
/// <summary>Returns the result of a spherical interpolation between two quaternions q1 and a2 using an interpolation parameter t.</summary>
/// <param name="q1">The first quaternion.</param>
/// <param name="q2">The second quaternion.</param>
/// <param name="t">The interpolation parameter.</param>
/// <returns>The spherical linear interpolation of two quaternions.</returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static quaternion slerp(quaternion q1, quaternion q2, float t)
{
float dt = dot(q1, q2);
if (dt < 0.0f)
{
dt = -dt;
q2.value = -q2.value;
}
if (dt < 0.9995f)
{
float angle = acos(dt);
float s = rsqrt(1.0f - dt * dt); // 1.0f / sin(angle)
float w1 = sin(angle * (1.0f - t)) * s;
float w2 = sin(angle * t) * s;
return quaternion(q1.value * w1 + q2.value * w2);
}
else
{
// if the angle is small, use linear interpolation
return nlerp(q1, q2, t);
}
}
/// <summary>Returns a uint hash code of a quaternion.</summary>
/// <param name="q">The quaternion to hash.</param>
/// <returns>The hash code for the input quaternion.</returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static uint hash(quaternion q)
{
return hash(q.value);
}
/// <summary>
/// Returns a uint4 vector hash code of a quaternion.
/// When multiple elements are to be hashes together, it can more efficient to calculate and combine wide hash
/// that are only reduced to a narrow uint hash at the very end instead of at every step.
/// </summary>
/// <param name="q">The quaternion to hash.</param>
/// <returns>The uint4 vector hash code of the input quaternion.</returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static uint4 hashwide(quaternion q)
{
return hashwide(q.value);
}
/// <summary>
/// Transforms the forward vector by a quaternion.
/// </summary>
/// <param name="q">The quaternion transformation.</param>
/// <returns>The forward vector transformed by the input quaternion.</returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static float3 forward(quaternion q) { return mul(q, float3(0, 0, 1)); } // for compatibility
}
}