public static Vector3 ToEulerRHS(Quaternion q)
{
Vector3 lhsVec = ToEuler(q);
lhsVec = new Vector3(-lhsVec.x, -lhsVec.y, lhsVec.z);
return(NormalizeAngles(lhsVec));
}
public static Vector3 ToEuler(Quaternion rotation)
{
float sqw = rotation.w * rotation.w;
float sqx = rotation.x * rotation.x;
float sqy = rotation.y * rotation.y;
float sqz = rotation.z * rotation.z;
float unit = sqx + sqy + sqz + sqw; // if normalised is one, otherwise is correction factor
float test = rotation.x * rotation.w - rotation.y * rotation.z;
Vector3 v = Vector3.zero;
if (test > 0.4995f * unit)
{ // singularity at north pole
v.y = 2f * Mathf.Atan2(rotation.y, rotation.x);
v.x = Maths.PI / 2;
v.z = 0;
return(NormalizeAngles(v * Maths.Rad2Deg));
}
if (test < -0.4995f * unit)
{ // singularity at south pole
v.y = -2f * Mathf.Atan2(rotation.y, rotation.x);
v.x = -Maths.PI / 2;
v.z = 0;
return(NormalizeAngles(v * Maths.Rad2Deg));
}
Quaternion q = new Quaternion(rotation.w, rotation.z, rotation.x, rotation.y);
v.y = (float)System.Math.Atan2(2f * q.x * q.w + 2f * q.y * q.z, 1 - 2f * (q.z * q.z + q.w * q.w)); // Yaw
v.x = (float)System.Math.Asin(2f * (q.x * q.z - q.w * q.y)); // Pitch
v.z = (float)System.Math.Atan2(2f * q.x * q.y + 2f * q.z * q.w, 1 - 2f * (q.y * q.y + q.z * q.z)); // Roll
return(NormalizeAngles(v * Maths.Rad2Deg));
}
public static Quaternion LookRotation(Vector3 direction, Vector3 up)
{
Vector3 forward = direction.normalized;
Vector3 right = Vector3.Cross(up, forward).normalized;
up = Vector3.Cross(forward, right);
var m00 = right.x;
var m01 = right.y;
var m02 = right.z;
var m10 = up.x;
var m11 = up.y;
var m12 = up.z;
var m20 = forward.x;
var m21 = forward.y;
var m22 = forward.z;
float num8 = (m00 + m11) + m22;
var quaternion = new Quaternion(1, 0, 0, 0);
if (num8 > 0f)
{
var num = (float)System.Math.Sqrt(num8 + 1f);
quaternion.w = num * 0.5f;
num = 0.5f / num;
quaternion.x = (m12 - m21) * num;
quaternion.y = (m20 - m02) * num;
quaternion.z = (m01 - m10) * num;
return(quaternion);
}
if ((m00 >= m11) && (m00 >= m22))
{
var num7 = (float)System.Math.Sqrt(((1f + m00) - m11) - m22);
var num4 = 0.5f / num7;
quaternion.x = 0.5f * num7;
quaternion.y = (m01 + m10) * num4;
quaternion.z = (m02 + m20) * num4;
quaternion.w = (m12 - m21) * num4;
return(quaternion);
}
if (m11 > m22)
{
var num6 = (float)System.Math.Sqrt(((1f + m11) - m00) - m22);
var num3 = 0.5f / num6;
quaternion.x = (m10 + m01) * num3;
quaternion.y = 0.5f * num6;
quaternion.z = (m21 + m12) * num3;
quaternion.w = (m20 - m02) * num3;
return(quaternion);
}
var num5 = (float)System.Math.Sqrt(((1f + m22) - m00) - m11);
var num2 = 0.5f / num5;
quaternion.x = (m20 + m02) * num2;
quaternion.y = (m21 + m12) * num2;
quaternion.z = 0.5f * num5;
quaternion.w = (m01 - m10) * num2;
return(quaternion);
}
public static Quaternion AngleAxis(float angle, Vector3 axis)
{
angle = Mathf.Deg2Rad(angle);
float w = (float)Math.Cos(angle / 2);
float x = (float)(axis.x * Math.Sin(angle / 2));
float y = (float)(axis.y * Math.Sin(angle / 2));
float z = (float)(axis.z * Math.Sin(angle / 2));
return(new Quaternion(w, x, y, z));
}
public static Quaternion FromEuler(Vector3 vector)
{
Vector3 rads = new Vector3((float)Mathf.Deg2Rad(vector.x), (float)Mathf.Deg2Rad(vector.y), (float)Mathf.Deg2Rad(vector.z));
float hr = rads.z * 0.5f;
float shr = (float)Math.Sin(hr);
float chr = (float)Math.Cos(hr);
float hp = rads.y * 0.5f;
float shp = (float)Math.Sin(hp);
float chp = (float)Math.Cos(hp);
float hy = rads.x * 0.5f;
float shy = (float)Math.Sin(hy);
float chy = (float)Math.Cos(hy);
float chy_shp = chy * shp;
float shy_chp = shy * chp;
float chy_chp = chy * chp;
float shy_shp = shy * shp;
return(new Quaternion((chy_chp * chr) + (shy_shp * shr), (shy_chp * chr) - (chy_shp * shr), (chy_shp * chr) + (shy_chp * shr), (chy_chp * shr) - (shy_shp * chr)));
}
public static Vector3 operator *(Quaternion q, Vector3 vector)
{
float num = q.x * 2f;
float num2 = q.y * 2f;
float num3 = q.z * 2f;
float num4 = q.x * num;
float num5 = q.y * num2;
float num6 = q.z * num3;
float num7 = q.x * num2;
float num8 = q.x * num3;
float num9 = q.y * num3;
float num10 = q.w * num;
float num11 = q.w * num2;
float num12 = q.w * num3;
Vector3 result = new Vector3(
(1f - (num5 + num6)) * vector.x + (num7 - num12) * vector.y + (num8 + num11) * vector.z,
(num7 + num12) * vector.x + (1f - (num4 + num6)) * vector.y + (num9 - num10) * vector.z,
(num8 - num11) * vector.x + (num9 + num10) * vector.y + (1f - (num4 + num5)) * vector.z);
return(result);
}
public static Quaternion FromToRotation(Vector3 fromDirection, Vector3 toDirection)
{
return(RotateTowards(LookRotation(fromDirection), LookRotation(toDirection), float.MaxValue));
}
private static Quaternion SlerpUnclamped(Quaternion a, Quaternion b, float t)
{
// if either input is zero, return the other.
if (Magnitude(a) * Magnitude(a) == 0.0f)
{
if (Magnitude(b) * Magnitude(b) == 0.0f)
{
return(identity);
}
return(b);
}
else if (Magnitude(b) * Magnitude(b) == 0.0f)
{
return(a);
}
float cosHalfAngle = a.w * b.w + Vector3.Dot(new Vector3(a.x, a.y, a.z), new Vector3(b.x, b.y, b.z));
Vector3.Dot(new Vector3(a.x, a.y, a.z), new Vector3(b.x, b.y, b.z));
if (cosHalfAngle >= 1.0f || cosHalfAngle <= -1.0f)
{
// angle = 0.0f, so just return one input.
return(a);
}
else if (cosHalfAngle < 0.0f)
{
b.x = -b.x;
b.y = -b.y;
b.z = -b.z;
b.w = -b.w;
cosHalfAngle = -cosHalfAngle;
}
float blendA;
float blendB;
if (cosHalfAngle < 0.99f)
{
// do proper slerp for big angles
float halfAngle = (float)System.Math.Acos(cosHalfAngle);
float sinHalfAngle = (float)System.Math.Sin(halfAngle);
float oneOverSinHalfAngle = 1.0f / sinHalfAngle;
blendA = (float)System.Math.Sin(halfAngle * (1.0f - t)) * oneOverSinHalfAngle;
blendB = (float)System.Math.Sin(halfAngle * t) * oneOverSinHalfAngle;
}
else
{
// do lerp if angle is really small.
blendA = 1.0f - t;
blendB = t;
}
Vector3 temp = blendA * new Vector3(a.x, a.y, a.z) + blendB * new Vector3(b.x, b.y, b.z);
Quaternion result = new Quaternion(blendA * a.w + blendB * b.w, temp.x, temp.y, temp.z);
if (Magnitude(result) * Magnitude(result) > 0.0f)
{
return(Normalize(result));
}
else
{
return(identity);
}
}
public static Quaternion FromEulerRHS(Vector3 vector)
{
Vector3 lhsVec = new Vector3(-vector.x, -vector.y, vector.z);
return(FromEuler(lhsVec));
}
public static Vector3 NormalizeAngles(Vector3 v)
{
return(new Vector3(Maths.RepeatAngle(v.x), Maths.RepeatAngle(v.y), Maths.RepeatAngle(v.z)));
}
public static Quaternion LookRotationRHS(Vector3 direction)
{
direction = new Vector3(direction.x, -direction.y, direction.z);
return(LookRotation(direction));
}
public static Quaternion LookRotationRHS(Vector3 direction, Vector3 up)
{
direction = new Vector3(direction.x, -direction.y, direction.z);
return(Quaternion.Inverse(LookRotation(direction, up)));
}
public static Quaternion LookRotation(Vector3 direction)
{
return(LookRotation(direction, Vector3.up));
}