Quat Euler 互轉
WXYZ
// COMPILE: g++ -o quat2EulerTest quat2EulerTest.cpp
#include <iostream>
#include <cmath>
using namespace std;
///////////////////////////////
// Quaternion struct
// Simple incomplete quaternion struct for demo purpose
///////////////////////////////
struct Quaternion {
Quaternion(): w(1), x(0), y(0), z(0) {};
Quaternion(double w, double x, double y, double z): w(w), x(x), y(y), z(z) {};
void normalize()
{
double norm = std::sqrt(x * x + y * y + z * z + w * w);
x /= norm;
y /= norm;
z /= norm;
w /= norm;
}
double norm()
{
return std::sqrt(x * x + y * y + z * z + w * w);
}
double w;
double x;
double y;
double z;
};
struct Euler {
Euler(): x(0), y(0), z(0) {};
Euler(double x, double y, double z): x(x), y(y), z(z) {};
double x;
double y;
double z;
};
///////////////////
// Helper functions
///////////////////////////////
ostream& operator <<(std::ostream& stream, const Quaternion& q)
{
stream << q.w << " " << showpos << q.x << "i " << q.y << "j " << q.z << "k";
stream << noshowpos;
return stream;
}
double rad2deg(double rad)
{
return rad * 180.0 / M_PI;
}
double deg2rad(double deg)
{
return deg * M_PI / 180.0;
}
Quaternion operator*(Quaternion& q1, Quaternion& q2)
{
Quaternion q;
q.w = q1.w * q2.w - q1.x * q2.x - q1.y * q2.y - q1.z * q2.z;
q.x = q1.w * q2.x + q1.x * q2.w + q1.y * q2.z - q1.z * q2.y;
q.y = q1.w * q2.y - q1.x * q2.z + q1.y * q2.w + q1.z * q2.x;
q.z = q1.w * q2.z + q1.x * q2.y - q1.y * q2.x + q1.z * q2.w;
return q;
}
///////////////////////////////
// Quaternion to Euler
///////////////////////////////
enum RotSeq {zyx, zyz, zxy, zxz, yxz, yxy, yzx, yzy, xyz, xyx, xzy, xzx};
void twoaxisrot(double r11, double r12, double r21, double r31, double r32,
double res[])
{
res[0] = atan2(r11, r12);
res[1] = acos(r21);
res[2] = atan2(r31, r32);
}
void threeaxisrot(double r11, double r12, double r21, double r31, double r32,
double res[])
{
res[0] = atan2(r31, r32);
res[1] = asin(r21);
res[2] = atan2(r11, r12);
}
void Euler2quaternion(const Euler& e, Quaternion& q, RotSeq rotSeq)
{
// w, y, z, z
Quaternion qx(cos(deg2rad(e.x) / 2.0), sin(deg2rad(e.x) / 2), 0, 0);
Quaternion qy(cos(deg2rad(e.y) / 2.0), 0, sin(deg2rad(e.y) / 2.0), 0);
Quaternion qz(cos(deg2rad(e.z) / 2.0), 0, 0, sin(deg2rad(e.z) / 2.0));
Quaternion q1;
switch (rotSeq) {
case xyz:
q1 = qy * qz;
q = qx * q1;
break;
case xzy:
q1 = qz * qy;
q = qx * q1;
break;
case yxz:
q1 = qx * qz;
q = qy * q1;
break;
case yzx:
q1 = qz * qx;
q = qy * q1;
break;
case zxy:
q1 = qx * qy;
q = qz * q1;
break;
case zyx:
q1 = qy * qx;
q = qz * q1;
break;
default:
std::cout << "Unknown rotation sequence" << std::endl;
break;
}
}
void quaternion2Euler(const Quaternion& q, double res[], RotSeq rotSeq)
{
switch (rotSeq) {
case zyx:
threeaxisrot(2 * (q.x * q.y + q.w * q.z),
q.w * q.w + q.x * q.x - q.y * q.y - q.z * q.z,
-2 * (q.x * q.z - q.w * q.y),
2 * (q.y * q.z + q.w * q.x),
q.w * q.w - q.x * q.x - q.y * q.y + q.z * q.z,
res);
break;
case zyz:
twoaxisrot(2 * (q.y * q.z - q.w * q.x),
2 * (q.x * q.z + q.w * q.y),
q.w * q.w - q.x * q.x - q.y * q.y + q.z * q.z,
2 * (q.y * q.z + q.w * q.x),
-2 * (q.x * q.z - q.w * q.y),
res);
break;
case zxy:
threeaxisrot(-2 * (q.x * q.y - q.w * q.z),
q.w * q.w - q.x * q.x + q.y * q.y - q.z * q.z,
2 * (q.y * q.z + q.w * q.x),
-2 * (q.x * q.z - q.w * q.y),
q.w * q.w - q.x * q.x - q.y * q.y + q.z * q.z,
res);
break;
case zxz:
twoaxisrot(2 * (q.x * q.z + q.w * q.y),
-2 * (q.y * q.z - q.w * q.x),
q.w * q.w - q.x * q.x - q.y * q.y + q.z * q.z,
2 * (q.x * q.z - q.w * q.y),
2 * (q.y * q.z + q.w * q.x),
res);
break;
case yxz:
threeaxisrot(2 * (q.x * q.z + q.w * q.y),
q.w * q.w - q.x * q.x - q.y * q.y + q.z * q.z,
-2 * (q.y * q.z - q.w * q.x),
2 * (q.x * q.y + q.w * q.z),
q.w * q.w - q.x * q.x + q.y * q.y - q.z * q.z,
res);
break;
case yxy:
twoaxisrot(2 * (q.x * q.y - q.w * q.z),
2 * (q.y * q.z + q.w * q.x),
q.w * q.w - q.x * q.x + q.y * q.y - q.z * q.z,
2 * (q.x * q.y + q.w * q.z),
-2 * (q.y * q.z - q.w * q.x),
res);
break;
case yzx:
threeaxisrot(-2 * (q.x * q.z - q.w * q.y),
q.w * q.w + q.x * q.x - q.y * q.y - q.z * q.z,
2 * (q.x * q.y + q.w * q.z),
-2 * (q.y * q.z - q.w * q.x),
q.w * q.w - q.x * q.x + q.y * q.y - q.z * q.z,
res);
break;
case yzy:
twoaxisrot(2 * (q.y * q.z + q.w * q.x),
-2 * (q.x * q.y - q.w * q.z),
q.w * q.w - q.x * q.x + q.y * q.y - q.z * q.z,
2 * (q.y * q.z - q.w * q.x),
2 * (q.x * q.y + q.w * q.z),
res);
break;
case xyz:
threeaxisrot(-2 * (q.y * q.z - q.w * q.x),
q.w * q.w - q.x * q.x - q.y * q.y + q.z * q.z,
2 * (q.x * q.z + q.w * q.y),
-2 * (q.x * q.y - q.w * q.z),
q.w * q.w + q.x * q.x - q.y * q.y - q.z * q.z,
res);
break;
case xyx:
twoaxisrot(2 * (q.x * q.y + q.w * q.z),
-2 * (q.x * q.z - q.w * q.y),
q.w * q.w + q.x * q.x - q.y * q.y - q.z * q.z,
2 * (q.x * q.y - q.w * q.z),
2 * (q.x * q.z + q.w * q.y),
res);
break;
case xzy:
threeaxisrot(2 * (q.y * q.z + q.w * q.x),
q.w * q.w - q.x * q.x + q.y * q.y - q.z * q.z,
-2 * (q.x * q.y - q.w * q.z),
2 * (q.x * q.z + q.w * q.y),
q.w * q.w + q.x * q.x - q.y * q.y - q.z * q.z,
res);
break;
case xzx:
twoaxisrot(2 * (q.x * q.z - q.w * q.y),
2 * (q.x * q.y + q.w * q.z),
q.w * q.w + q.x * q.x - q.y * q.y - q.z * q.z,
2 * (q.x * q.z + q.w * q.y),
-2 * (q.x * q.y - q.w * q.z),
res);
break;
default:
std::cout << "Unknown rotation sequence" << std::endl;
break;
}
}
///////////////////////////////
// Main
///////////////////////////////
int main()
{
#if 1
double res[3];
Quaternion q;
Euler e(-45, -45, -5);
Euler2quaternion(e, q, zyx);
cout << "quat w = " << q.w << endl;
cout << "quat x = " << q.x << endl;
cout << "quat y = " << q.y << endl;
cout << "quat z = " << q.z << endl;
quaternion2Euler(q, res, zyx);
printf("euler x=%f\n", rad2deg(res[0]));
printf("euler y=%f\n", rad2deg(res[1]));
printf("euler z=%f\n", rad2deg(res[2]));
#else
Quaternion q; // x,y,z,w
Quaternion qx45(sin(M_PI / 8), 0, 0, cos(M_PI / 8));
Quaternion qy45(0, sin(M_PI / 8), 0, cos(M_PI / 8));
Quaternion qz45(0, 0, sin(M_PI / 8), cos(M_PI / 8));
Quaternion qx90(sin(M_PI / 4), 0, 0, cos(M_PI / 4));
Quaternion qy90(0, sin(M_PI / 4), 0, cos(M_PI / 4));
Quaternion qz90(0, 0, sin(M_PI / 4), cos(M_PI / 4));
double res[3];
q = qz45 * qx45;
q.normalize();
quaternion2Euler(q, res, zyx);
cout << "Rotation sequence: X->Y->Z" << endl;
cout << "x45 -> z45" << endl;
cout << "q: " << q << endl;
cout << "x: " << rad2deg(res[0]) << " y: " << rad2deg(res[1]) << " z: " <<
rad2deg(res[2]) << endl << endl;
q = qz90 * qx90;
q.normalize();
quaternion2Euler(q, res, zyx);
cout << "Rotation sequence: X->Y->Z" << endl;
cout << "x90 -> z90" << endl;
cout << "q: " << q << endl;
cout << "x: " << rad2deg(res[0]) << " y: " << rad2deg(res[1]) << " z: " <<
rad2deg(res[2]) << endl << endl;
q = qx90 * qz90;
q.normalize();
quaternion2Euler(q, res, xyz);
cout << "Rotation sequence: Z->Y->X" << endl;
cout << "z90 -> x90" << endl;
cout << "q: " << q << endl;
cout << "x: " << rad2deg(res[0]) << " y: " << rad2deg(res[1]) << " z: " <<
rad2deg(res[2]) << endl;
#endif
}
XYZW
// COMPILE: g++ -o quat2EulerTest quat2EulerTest.cpp
#include <iostream>
#include <cmath>
using namespace std;
///////////////////////////////
// Quaternion struct
// Simple incomplete quaternion struct for demo purpose
///////////////////////////////
struct Quaternion {
Quaternion(): x(0), y(0), z(0), w(1) {};
Quaternion(double x, double y, double z, double w): x(x), y(y), z(z), w(w) {};
void normalize()
{
double norm = std::sqrt(x * x + y * y + z * z + w * w);
x /= norm;
y /= norm;
z /= norm;
w /= norm;
}
double norm()
{
return std::sqrt(x * x + y * y + z * z + w * w);
}
double x;
double y;
double z;
double w;
};
struct Euler {
Euler(): x(0), y(0), z(0) {};
Euler(double x, double y, double z): x(x), y(y), z(z) {};
double x;
double y;
double z;
};
///////////////////
// Helper functions
///////////////////////////////
ostream& operator <<(std::ostream& stream, const Quaternion& q)
{
stream << q.w << " " << showpos << q.x << "i " << q.y << "j " << q.z << "k";
stream << noshowpos;
return stream;
}
double rad2deg(double rad)
{
return rad * 180.0 / M_PI;
}
double deg2rad(double deg)
{
return deg * M_PI / 180.0;
}
Quaternion operator*(Quaternion& q1, Quaternion& q2)
{
Quaternion q;
q.w = q1.w * q2.w - q1.x * q2.x - q1.y * q2.y - q1.z * q2.z;
q.x = q1.w * q2.x + q1.x * q2.w + q1.y * q2.z - q1.z * q2.y;
q.y = q1.w * q2.y - q1.x * q2.z + q1.y * q2.w + q1.z * q2.x;
q.z = q1.w * q2.z + q1.x * q2.y - q1.y * q2.x + q1.z * q2.w;
return q;
}
///////////////////////////////
// Quaternion to Euler
///////////////////////////////
enum RotSeq {zyx, zyz, zxy, zxz, yxz, yxy, yzx, yzy, xyz, xyx, xzy, xzx};
void twoaxisrot(double r11, double r12, double r21, double r31, double r32,
double res[])
{
res[0] = atan2(r11, r12);
res[1] = acos(r21);
res[2] = atan2(r31, r32);
}
void threeaxisrot(double r11, double r12, double r21, double r31, double r32,
double res[])
{
res[0] = atan2(r31, r32);
res[1] = asin(r21);
res[2] = atan2(r11, r12);
}
void Euler2quaternion(const Euler& e, Quaternion& q, RotSeq rotSeq)
{
// x, y, z, w
Quaternion qx(sin(deg2rad(e.x) / 2), 0, 0, cos(deg2rad(e.x) / 2.0));
Quaternion qy(0, sin(deg2rad(e.y) / 2.0), 0, cos(deg2rad(e.y) / 2.0));
Quaternion qz(0, 0, sin(deg2rad(e.z) / 2.0), cos(deg2rad(e.z) / 2.0));
Quaternion q1;
switch (rotSeq) {
case xyz:
q1 = qy * qz;
q = qx * q1;
break;
case xzy:
q1 = qz * qy;
q = qx * q1;
break;
case yxz:
q1 = qx * qz;
q = qy * q1;
break;
case yzx:
q1 = qz * qx;
q = qy * q1;
break;
case zxy:
q1 = qx * qy;
q = qz * q1;
break;
case zyx:
q1 = qy * qx;
q = qz * q1;
break;
default:
std::cout << "Unknown rotation sequence" << std::endl;
break;
}
}
void quaternion2Euler(const Quaternion& q, double res[], RotSeq rotSeq)
{
switch (rotSeq) {
case zyx:
threeaxisrot(2 * (q.x * q.y + q.w * q.z),
q.w * q.w + q.x * q.x - q.y * q.y - q.z * q.z,
-2 * (q.x * q.z - q.w * q.y),
2 * (q.y * q.z + q.w * q.x),
q.w * q.w - q.x * q.x - q.y * q.y + q.z * q.z,
res);
break;
case zyz:
twoaxisrot(2 * (q.y * q.z - q.w * q.x),
2 * (q.x * q.z + q.w * q.y),
q.w * q.w - q.x * q.x - q.y * q.y + q.z * q.z,
2 * (q.y * q.z + q.w * q.x),
-2 * (q.x * q.z - q.w * q.y),
res);
break;
case zxy:
threeaxisrot(-2 * (q.x * q.y - q.w * q.z),
q.w * q.w - q.x * q.x + q.y * q.y - q.z * q.z,
2 * (q.y * q.z + q.w * q.x),
-2 * (q.x * q.z - q.w * q.y),
q.w * q.w - q.x * q.x - q.y * q.y + q.z * q.z,
res);
break;
case zxz:
twoaxisrot(2 * (q.x * q.z + q.w * q.y),
-2 * (q.y * q.z - q.w * q.x),
q.w * q.w - q.x * q.x - q.y * q.y + q.z * q.z,
2 * (q.x * q.z - q.w * q.y),
2 * (q.y * q.z + q.w * q.x),
res);
break;
case yxz:
threeaxisrot(2 * (q.x * q.z + q.w * q.y),
q.w * q.w - q.x * q.x - q.y * q.y + q.z * q.z,
-2 * (q.y * q.z - q.w * q.x),
2 * (q.x * q.y + q.w * q.z),
q.w * q.w - q.x * q.x + q.y * q.y - q.z * q.z,
res);
break;
case yxy:
twoaxisrot(2 * (q.x * q.y - q.w * q.z),
2 * (q.y * q.z + q.w * q.x),
q.w * q.w - q.x * q.x + q.y * q.y - q.z * q.z,
2 * (q.x * q.y + q.w * q.z),
-2 * (q.y * q.z - q.w * q.x),
res);
break;
case yzx:
threeaxisrot(-2 * (q.x * q.z - q.w * q.y),
q.w * q.w + q.x * q.x - q.y * q.y - q.z * q.z,
2 * (q.x * q.y + q.w * q.z),
-2 * (q.y * q.z - q.w * q.x),
q.w * q.w - q.x * q.x + q.y * q.y - q.z * q.z,
res);
break;
case yzy:
twoaxisrot(2 * (q.y * q.z + q.w * q.x),
-2 * (q.x * q.y - q.w * q.z),
q.w * q.w - q.x * q.x + q.y * q.y - q.z * q.z,
2 * (q.y * q.z - q.w * q.x),
2 * (q.x * q.y + q.w * q.z),
res);
break;
case xyz:
threeaxisrot(-2 * (q.y * q.z - q.w * q.x),
q.w * q.w - q.x * q.x - q.y * q.y + q.z * q.z,
2 * (q.x * q.z + q.w * q.y),
-2 * (q.x * q.y - q.w * q.z),
q.w * q.w + q.x * q.x - q.y * q.y - q.z * q.z,
res);
break;
case xyx:
twoaxisrot(2 * (q.x * q.y + q.w * q.z),
-2 * (q.x * q.z - q.w * q.y),
q.w * q.w + q.x * q.x - q.y * q.y - q.z * q.z,
2 * (q.x * q.y - q.w * q.z),
2 * (q.x * q.z + q.w * q.y),
res);
break;
case xzy:
threeaxisrot(2 * (q.y * q.z + q.w * q.x),
q.w * q.w - q.x * q.x + q.y * q.y - q.z * q.z,
-2 * (q.x * q.y - q.w * q.z),
2 * (q.x * q.z + q.w * q.y),
q.w * q.w + q.x * q.x - q.y * q.y - q.z * q.z,
res);
break;
case xzx:
twoaxisrot(2 * (q.x * q.z - q.w * q.y),
2 * (q.x * q.y + q.w * q.z),
q.w * q.w + q.x * q.x - q.y * q.y - q.z * q.z,
2 * (q.x * q.z + q.w * q.y),
-2 * (q.x * q.y - q.w * q.z),
res);
break;
default:
std::cout << "Unknown rotation sequence" << std::endl;
break;
}
}
///////////////////////////////
// Main
///////////////////////////////
int main()
{
#if 1
double res[3];
Quaternion q;
Euler e(45, 45, 0);
Euler2quaternion(e, q, zyx);
cout << "quat w = " << q.w << endl;
cout << "quat x = " << q.x << endl;
cout << "quat y = " << q.y << endl;
cout << "quat z = " << q.z << endl;
quaternion2Euler(q, res, zyx);
printf("euler x=%f\n", rad2deg(res[0]));
printf("euler y=%f\n", rad2deg(res[1]));
printf("euler z=%f\n", rad2deg(res[2]));
#else
Quaternion q; // x,y,z,w
Quaternion qx45(sin(M_PI / 8), 0, 0, cos(M_PI / 8));
Quaternion qy45(0, sin(M_PI / 8), 0, cos(M_PI / 8));
Quaternion qz45(0, 0, sin(M_PI / 8), cos(M_PI / 8));
Quaternion qx90(sin(M_PI / 4), 0, 0, cos(M_PI / 4));
Quaternion qy90(0, sin(M_PI / 4), 0, cos(M_PI / 4));
Quaternion qz90(0, 0, sin(M_PI / 4), cos(M_PI / 4));
double res[3];
q = qz45 * qx45;
q.normalize();
quaternion2Euler(q, res, zyx);
cout << "Rotation sequence: X->Y->Z" << endl;
cout << "x45 -> z45" << endl;
cout << "q: " << q << endl;
cout << "x: " << rad2deg(res[0]) << " y: " << rad2deg(res[1]) << " z: " <<
rad2deg(res[2]) << endl << endl;
q = qz90 * qx90;
q.normalize();
quaternion2Euler(q, res, zyx);
cout << "Rotation sequence: X->Y->Z" << endl;
cout << "x90 -> z90" << endl;
cout << "q: " << q << endl;
cout << "x: " << rad2deg(res[0]) << " y: " << rad2deg(res[1]) << " z: " <<
rad2deg(res[2]) << endl << endl;
q = qx90 * qz90;
q.normalize();
quaternion2Euler(q, res, xyz);
cout << "Rotation sequence: Z->Y->X" << endl;
cout << "z90 -> x90" << endl;
cout << "q: " << q << endl;
cout << "x: " << rad2deg(res[0]) << " y: " << rad2deg(res[1]) << " z: " <<
rad2deg(res[2]) << endl;
#endif
}
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