/usr/include/libwildmagic/Wm5Matrix3.inl is in libwildmagic-dev 5.13-1ubuntu3.
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// Copyright (c) 1998-2014
// Distributed under the Boost Software License, Version 1.0.
// http://www.boost.org/LICENSE_1_0.txt
// http://www.geometrictools.com/License/Boost/LICENSE_1_0.txt
//
// File Version: 5.0.2 (2012/07/29)
//----------------------------------------------------------------------------
template <typename Real>
Matrix3<Real>::Matrix3 (bool makeZero)
{
if (makeZero)
{
MakeZero();
}
else
{
MakeIdentity();
}
}
//----------------------------------------------------------------------------
template <typename Real>
Matrix3<Real>::Matrix3 (const Matrix3& mat)
{
mEntry[0] = mat.mEntry[0];
mEntry[1] = mat.mEntry[1];
mEntry[2] = mat.mEntry[2];
mEntry[3] = mat.mEntry[3];
mEntry[4] = mat.mEntry[4];
mEntry[5] = mat.mEntry[5];
mEntry[6] = mat.mEntry[6];
mEntry[7] = mat.mEntry[7];
mEntry[8] = mat.mEntry[8];
}
//----------------------------------------------------------------------------
template <typename Real>
Matrix3<Real>::Matrix3 (Real m00, Real m01, Real m02, Real m10, Real m11,
Real m12, Real m20, Real m21, Real m22)
{
mEntry[0] = m00;
mEntry[1] = m01;
mEntry[2] = m02;
mEntry[3] = m10;
mEntry[4] = m11;
mEntry[5] = m12;
mEntry[6] = m20;
mEntry[7] = m21;
mEntry[8] = m22;
}
//----------------------------------------------------------------------------
template <typename Real>
Matrix3<Real>::Matrix3 (const Real entry[9], bool rowMajor)
{
if (rowMajor)
{
mEntry[0] = entry[0];
mEntry[1] = entry[1];
mEntry[2] = entry[2];
mEntry[3] = entry[3];
mEntry[4] = entry[4];
mEntry[5] = entry[5];
mEntry[6] = entry[6];
mEntry[7] = entry[7];
mEntry[8] = entry[8];
}
else
{
mEntry[0] = entry[0];
mEntry[1] = entry[3];
mEntry[2] = entry[6];
mEntry[3] = entry[1];
mEntry[4] = entry[4];
mEntry[5] = entry[7];
mEntry[6] = entry[2];
mEntry[7] = entry[5];
mEntry[8] = entry[8];
}
}
//----------------------------------------------------------------------------
template <typename Real>
Matrix3<Real>::Matrix3 (const Vector3<Real>& u, const Vector3<Real>& v,
const Vector3<Real>& w, bool columns)
{
if (columns)
{
mEntry[0] = u[0];
mEntry[1] = v[0];
mEntry[2] = w[0];
mEntry[3] = u[1];
mEntry[4] = v[1];
mEntry[5] = w[1];
mEntry[6] = u[2];
mEntry[7] = v[2];
mEntry[8] = w[2];
}
else
{
mEntry[0] = u[0];
mEntry[1] = u[1];
mEntry[2] = u[2];
mEntry[3] = v[0];
mEntry[4] = v[1];
mEntry[5] = v[2];
mEntry[6] = w[0];
mEntry[7] = w[1];
mEntry[8] = w[2];
}
}
//----------------------------------------------------------------------------
template <typename Real>
Matrix3<Real>::Matrix3 (const Vector3<Real>* v, bool columns)
{
if (columns)
{
mEntry[0] = v[0][0];
mEntry[1] = v[1][0];
mEntry[2] = v[2][0];
mEntry[3] = v[0][1];
mEntry[4] = v[1][1];
mEntry[5] = v[2][1];
mEntry[6] = v[0][2];
mEntry[7] = v[1][2];
mEntry[8] = v[2][2];
}
else
{
mEntry[0] = v[0][0];
mEntry[1] = v[0][1];
mEntry[2] = v[0][2];
mEntry[3] = v[1][0];
mEntry[4] = v[1][1];
mEntry[5] = v[1][2];
mEntry[6] = v[2][0];
mEntry[7] = v[2][1];
mEntry[8] = v[2][2];
}
}
//----------------------------------------------------------------------------
template <typename Real>
Matrix3<Real>::Matrix3 (Real m00, Real m11, Real m22)
{
MakeDiagonal(m00, m11, m22);
}
//----------------------------------------------------------------------------
template <typename Real>
Matrix3<Real>::Matrix3 (const Vector3<Real>& axis, Real angle)
{
MakeRotation(axis, angle);
}
//----------------------------------------------------------------------------
template <typename Real>
Matrix3<Real>::Matrix3 (const Vector3<Real>& u, const Vector3<Real>& v)
{
MakeTensorProduct(u, v);
}
//----------------------------------------------------------------------------
template <typename Real>
Matrix3<Real>& Matrix3<Real>::operator= (const Matrix3& mat)
{
mEntry[0] = mat.mEntry[0];
mEntry[1] = mat.mEntry[1];
mEntry[2] = mat.mEntry[2];
mEntry[3] = mat.mEntry[3];
mEntry[4] = mat.mEntry[4];
mEntry[5] = mat.mEntry[5];
mEntry[6] = mat.mEntry[6];
mEntry[7] = mat.mEntry[7];
mEntry[8] = mat.mEntry[8];
return *this;
}
//----------------------------------------------------------------------------
template <typename Real>
Matrix3<Real>& Matrix3<Real>::MakeZero ()
{
mEntry[0] = (Real)0;
mEntry[1] = (Real)0;
mEntry[2] = (Real)0;
mEntry[3] = (Real)0;
mEntry[4] = (Real)0;
mEntry[5] = (Real)0;
mEntry[6] = (Real)0;
mEntry[7] = (Real)0;
mEntry[8] = (Real)0;
return *this;
}
//----------------------------------------------------------------------------
template <typename Real>
Matrix3<Real>& Matrix3<Real>::MakeIdentity ()
{
mEntry[0] = (Real)1;
mEntry[1] = (Real)0;
mEntry[2] = (Real)0;
mEntry[3] = (Real)0;
mEntry[4] = (Real)1;
mEntry[5] = (Real)0;
mEntry[6] = (Real)0;
mEntry[7] = (Real)0;
mEntry[8] = (Real)1;
return *this;
}
//----------------------------------------------------------------------------
template <typename Real>
Matrix3<Real>& Matrix3<Real>::MakeDiagonal (Real m00, Real m11, Real m22)
{
mEntry[0] = m00;
mEntry[1] = (Real)0;
mEntry[2] = (Real)0;
mEntry[3] = (Real)0;
mEntry[4] = m11;
mEntry[5] = (Real)0;
mEntry[6] = (Real)0;
mEntry[7] = (Real)0;
mEntry[8] = m22;
return *this;
}
//----------------------------------------------------------------------------
template <typename Real>
Matrix3<Real>& Matrix3<Real>::MakeRotation (const Vector3<Real>& axis,
Real angle)
{
Real cs = Math<Real>::Cos(angle);
Real sn = Math<Real>::Sin(angle);
Real oneMinusCos = ((Real)1) - cs;
Real x2 = axis[0]*axis[0];
Real y2 = axis[1]*axis[1];
Real z2 = axis[2]*axis[2];
Real xym = axis[0]*axis[1]*oneMinusCos;
Real xzm = axis[0]*axis[2]*oneMinusCos;
Real yzm = axis[1]*axis[2]*oneMinusCos;
Real xSin = axis[0]*sn;
Real ySin = axis[1]*sn;
Real zSin = axis[2]*sn;
mEntry[0] = x2*oneMinusCos + cs;
mEntry[1] = xym - zSin;
mEntry[2] = xzm + ySin;
mEntry[3] = xym + zSin;
mEntry[4] = y2*oneMinusCos + cs;
mEntry[5] = yzm - xSin;
mEntry[6] = xzm - ySin;
mEntry[7] = yzm + xSin;
mEntry[8] = z2*oneMinusCos + cs;
return *this;
}
//----------------------------------------------------------------------------
template <typename Real>
Matrix3<Real>& Matrix3<Real>::MakeTensorProduct (const Vector3<Real>& u,
const Vector3<Real>& v)
{
mEntry[0] = u[0]*v[0];
mEntry[1] = u[0]*v[1];
mEntry[2] = u[0]*v[2];
mEntry[3] = u[1]*v[0];
mEntry[4] = u[1]*v[1];
mEntry[5] = u[1]*v[2];
mEntry[6] = u[2]*v[0];
mEntry[7] = u[2]*v[1];
mEntry[8] = u[2]*v[2];
return *this;
}
//----------------------------------------------------------------------------
template <typename Real>
Matrix3<Real> Matrix3<Real>::operator+ (const Matrix3& mat) const
{
return Matrix3<Real>
(
mEntry[0] + mat.mEntry[0],
mEntry[1] + mat.mEntry[1],
mEntry[2] + mat.mEntry[2],
mEntry[3] + mat.mEntry[3],
mEntry[4] + mat.mEntry[4],
mEntry[5] + mat.mEntry[5],
mEntry[6] + mat.mEntry[6],
mEntry[7] + mat.mEntry[7],
mEntry[8] + mat.mEntry[8]
);
}
//----------------------------------------------------------------------------
template <typename Real>
Matrix3<Real> Matrix3<Real>::operator- (const Matrix3& mat) const
{
return Matrix3<Real>
(
mEntry[0] - mat.mEntry[0],
mEntry[1] - mat.mEntry[1],
mEntry[2] - mat.mEntry[2],
mEntry[3] - mat.mEntry[3],
mEntry[4] - mat.mEntry[4],
mEntry[5] - mat.mEntry[5],
mEntry[6] - mat.mEntry[6],
mEntry[7] - mat.mEntry[7],
mEntry[8] - mat.mEntry[8]
);
}
//----------------------------------------------------------------------------
template <typename Real>
Matrix3<Real> Matrix3<Real>::operator* (Real scalar) const
{
return Matrix3<Real>
(
scalar*mEntry[0],
scalar*mEntry[1],
scalar*mEntry[2],
scalar*mEntry[3],
scalar*mEntry[4],
scalar*mEntry[5],
scalar*mEntry[6],
scalar*mEntry[7],
scalar*mEntry[8]
);
}
//----------------------------------------------------------------------------
template <typename Real>
Matrix3<Real> Matrix3<Real>::operator/ (Real scalar) const
{
if (scalar != (Real)0)
{
Real invScalar = ((Real)1)/scalar;
return Matrix3<Real>
(
invScalar*mEntry[0],
invScalar*mEntry[1],
invScalar*mEntry[2],
invScalar*mEntry[3],
invScalar*mEntry[4],
invScalar*mEntry[5],
invScalar*mEntry[6],
invScalar*mEntry[7],
invScalar*mEntry[8]
);
}
else
{
return Matrix3<Real>
(
Math<Real>::MAX_REAL,
Math<Real>::MAX_REAL,
Math<Real>::MAX_REAL,
Math<Real>::MAX_REAL,
Math<Real>::MAX_REAL,
Math<Real>::MAX_REAL,
Math<Real>::MAX_REAL,
Math<Real>::MAX_REAL,
Math<Real>::MAX_REAL
);
}
}
//----------------------------------------------------------------------------
template <typename Real>
Matrix3<Real> Matrix3<Real>::operator- () const
{
return Matrix3<Real>
(
-mEntry[0],
-mEntry[1],
-mEntry[2],
-mEntry[3],
-mEntry[4],
-mEntry[5],
-mEntry[6],
-mEntry[7],
-mEntry[8]
);
}
//----------------------------------------------------------------------------
template <typename Real>
Matrix3<Real>& Matrix3<Real>::operator+= (const Matrix3& mat)
{
mEntry[0] += mat.mEntry[0];
mEntry[1] += mat.mEntry[1];
mEntry[2] += mat.mEntry[2];
mEntry[3] += mat.mEntry[3];
mEntry[4] += mat.mEntry[4];
mEntry[5] += mat.mEntry[5];
mEntry[6] += mat.mEntry[6];
mEntry[7] += mat.mEntry[7];
mEntry[8] += mat.mEntry[8];
return *this;
}
//----------------------------------------------------------------------------
template <typename Real>
Matrix3<Real>& Matrix3<Real>::operator-= (const Matrix3& mat)
{
mEntry[0] -= mat.mEntry[0];
mEntry[1] -= mat.mEntry[1];
mEntry[2] -= mat.mEntry[2];
mEntry[3] -= mat.mEntry[3];
mEntry[4] -= mat.mEntry[4];
mEntry[5] -= mat.mEntry[5];
mEntry[6] -= mat.mEntry[6];
mEntry[7] -= mat.mEntry[7];
mEntry[8] -= mat.mEntry[8];
return *this;
}
//----------------------------------------------------------------------------
template <typename Real>
Matrix3<Real>& Matrix3<Real>::operator*= (Real scalar)
{
mEntry[0] *= scalar;
mEntry[1] *= scalar;
mEntry[2] *= scalar;
mEntry[3] *= scalar;
mEntry[4] *= scalar;
mEntry[5] *= scalar;
mEntry[6] *= scalar;
mEntry[7] *= scalar;
mEntry[8] *= scalar;
return *this;
}
//----------------------------------------------------------------------------
template <typename Real>
Matrix3<Real>& Matrix3<Real>::operator/= (Real scalar)
{
if (scalar != (Real)0)
{
Real invScalar = ((Real)1)/scalar;
mEntry[0] *= invScalar;
mEntry[1] *= invScalar;
mEntry[2] *= invScalar;
mEntry[3] *= invScalar;
mEntry[4] *= invScalar;
mEntry[5] *= invScalar;
mEntry[6] *= invScalar;
mEntry[7] *= invScalar;
mEntry[8] *= invScalar;
}
else
{
mEntry[0] = Math<Real>::MAX_REAL;
mEntry[1] = Math<Real>::MAX_REAL;
mEntry[2] = Math<Real>::MAX_REAL;
mEntry[3] = Math<Real>::MAX_REAL;
mEntry[4] = Math<Real>::MAX_REAL;
mEntry[5] = Math<Real>::MAX_REAL;
mEntry[6] = Math<Real>::MAX_REAL;
mEntry[7] = Math<Real>::MAX_REAL;
mEntry[8] = Math<Real>::MAX_REAL;
}
return *this;
}
//----------------------------------------------------------------------------
template <typename Real>
Vector3<Real> Matrix3<Real>::operator* (const Vector3<Real>& vec) const
{
return Vector3<Real>
(
mEntry[0]*vec[0] + mEntry[1]*vec[1] + mEntry[2]*vec[2],
mEntry[3]*vec[0] + mEntry[4]*vec[1] + mEntry[5]*vec[2],
mEntry[6]*vec[0] + mEntry[7]*vec[1] + mEntry[8]*vec[2]
);
}
//----------------------------------------------------------------------------
template <typename Real>
Real Matrix3<Real>::QForm (const Vector3<Real>& u, const Vector3<Real>& v)
const
{
return u.Dot((*this)*v);
}
//----------------------------------------------------------------------------
template <typename Real>
Matrix3<Real> Matrix3<Real>::Transpose () const
{
return Matrix3<Real>
(
mEntry[0],
mEntry[3],
mEntry[6],
mEntry[1],
mEntry[4],
mEntry[7],
mEntry[2],
mEntry[5],
mEntry[8]
);
}
//----------------------------------------------------------------------------
template <typename Real>
Matrix3<Real> Matrix3<Real>::operator* (const Matrix3& mat) const
{
// A*B
return Matrix3<Real>
(
mEntry[0]*mat.mEntry[0] +
mEntry[1]*mat.mEntry[3] +
mEntry[2]*mat.mEntry[6],
mEntry[0]*mat.mEntry[1] +
mEntry[1]*mat.mEntry[4] +
mEntry[2]*mat.mEntry[7],
mEntry[0]*mat.mEntry[2] +
mEntry[1]*mat.mEntry[5] +
mEntry[2]*mat.mEntry[8],
mEntry[3]*mat.mEntry[0] +
mEntry[4]*mat.mEntry[3] +
mEntry[5]*mat.mEntry[6],
mEntry[3]*mat.mEntry[1] +
mEntry[4]*mat.mEntry[4] +
mEntry[5]*mat.mEntry[7],
mEntry[3]*mat.mEntry[2] +
mEntry[4]*mat.mEntry[5] +
mEntry[5]*mat.mEntry[8],
mEntry[6]*mat.mEntry[0] +
mEntry[7]*mat.mEntry[3] +
mEntry[8]*mat.mEntry[6],
mEntry[6]*mat.mEntry[1] +
mEntry[7]*mat.mEntry[4] +
mEntry[8]*mat.mEntry[7],
mEntry[6]*mat.mEntry[2] +
mEntry[7]*mat.mEntry[5] +
mEntry[8]*mat.mEntry[8]
);
}
//----------------------------------------------------------------------------
template <typename Real>
Matrix3<Real> Matrix3<Real>::TransposeTimes (const Matrix3& mat) const
{
// A^T*B
return Matrix3<Real>
(
mEntry[0]*mat.mEntry[0] +
mEntry[3]*mat.mEntry[3] +
mEntry[6]*mat.mEntry[6],
mEntry[0]*mat.mEntry[1] +
mEntry[3]*mat.mEntry[4] +
mEntry[6]*mat.mEntry[7],
mEntry[0]*mat.mEntry[2] +
mEntry[3]*mat.mEntry[5] +
mEntry[6]*mat.mEntry[8],
mEntry[1]*mat.mEntry[0] +
mEntry[4]*mat.mEntry[3] +
mEntry[7]*mat.mEntry[6],
mEntry[1]*mat.mEntry[1] +
mEntry[4]*mat.mEntry[4] +
mEntry[7]*mat.mEntry[7],
mEntry[1]*mat.mEntry[2] +
mEntry[4]*mat.mEntry[5] +
mEntry[7]*mat.mEntry[8],
mEntry[2]*mat.mEntry[0] +
mEntry[5]*mat.mEntry[3] +
mEntry[8]*mat.mEntry[6],
mEntry[2]*mat.mEntry[1] +
mEntry[5]*mat.mEntry[4] +
mEntry[8]*mat.mEntry[7],
mEntry[2]*mat.mEntry[2] +
mEntry[5]*mat.mEntry[5] +
mEntry[8]*mat.mEntry[8]
);
}
//----------------------------------------------------------------------------
template <typename Real>
Matrix3<Real> Matrix3<Real>::TimesTranspose (const Matrix3& mat) const
{
// A*B^T
return Matrix3<Real>
(
mEntry[0]*mat.mEntry[0] +
mEntry[1]*mat.mEntry[1] +
mEntry[2]*mat.mEntry[2],
mEntry[0]*mat.mEntry[3] +
mEntry[1]*mat.mEntry[4] +
mEntry[2]*mat.mEntry[5],
mEntry[0]*mat.mEntry[6] +
mEntry[1]*mat.mEntry[7] +
mEntry[2]*mat.mEntry[8],
mEntry[3]*mat.mEntry[0] +
mEntry[4]*mat.mEntry[1] +
mEntry[5]*mat.mEntry[2],
mEntry[3]*mat.mEntry[3] +
mEntry[4]*mat.mEntry[4] +
mEntry[5]*mat.mEntry[5],
mEntry[3]*mat.mEntry[6] +
mEntry[4]*mat.mEntry[7] +
mEntry[5]*mat.mEntry[8],
mEntry[6]*mat.mEntry[0] +
mEntry[7]*mat.mEntry[1] +
mEntry[8]*mat.mEntry[2],
mEntry[6]*mat.mEntry[3] +
mEntry[7]*mat.mEntry[4] +
mEntry[8]*mat.mEntry[5],
mEntry[6]*mat.mEntry[6] +
mEntry[7]*mat.mEntry[7] +
mEntry[8]*mat.mEntry[8]
);
}
//----------------------------------------------------------------------------
template <typename Real>
Matrix3<Real> Matrix3<Real>::TransposeTimesTranspose (const Matrix3& mat)
const
{
// A^T*B^T
return Matrix3<Real>
(
mEntry[0]*mat.mEntry[0] +
mEntry[3]*mat.mEntry[1] +
mEntry[6]*mat.mEntry[2],
mEntry[0]*mat.mEntry[3] +
mEntry[3]*mat.mEntry[4] +
mEntry[6]*mat.mEntry[5],
mEntry[0]*mat.mEntry[6] +
mEntry[3]*mat.mEntry[7] +
mEntry[6]*mat.mEntry[8],
mEntry[1]*mat.mEntry[0] +
mEntry[4]*mat.mEntry[1] +
mEntry[7]*mat.mEntry[2],
mEntry[1]*mat.mEntry[3] +
mEntry[4]*mat.mEntry[4] +
mEntry[7]*mat.mEntry[5],
mEntry[1]*mat.mEntry[6] +
mEntry[4]*mat.mEntry[7] +
mEntry[7]*mat.mEntry[8],
mEntry[2]*mat.mEntry[0] +
mEntry[5]*mat.mEntry[1] +
mEntry[8]*mat.mEntry[2],
mEntry[2]*mat.mEntry[3] +
mEntry[5]*mat.mEntry[4] +
mEntry[8]*mat.mEntry[5],
mEntry[2]*mat.mEntry[6] +
mEntry[5]*mat.mEntry[7] +
mEntry[8]*mat.mEntry[8]
);
}
//----------------------------------------------------------------------------
template <typename Real>
Matrix3<Real> Matrix3<Real>::TimesDiagonal (const Vector3<Real>& diag) const
{
return Matrix3<Real>
(
mEntry[0]*diag[0],
mEntry[1]*diag[1],
mEntry[2]*diag[2],
mEntry[3]*diag[0],
mEntry[4]*diag[1],
mEntry[5]*diag[2],
mEntry[6]*diag[0],
mEntry[7]*diag[1],
mEntry[8]*diag[2]
);
}
//----------------------------------------------------------------------------
template <typename Real>
Matrix3<Real> Matrix3<Real>::DiagonalTimes (const Vector3<Real>& diag) const
{
return Matrix3<Real>
(
diag[0]*mEntry[0],
diag[0]*mEntry[1],
diag[0]*mEntry[2],
diag[1]*mEntry[3],
diag[1]*mEntry[4],
diag[1]*mEntry[5],
diag[2]*mEntry[6],
diag[2]*mEntry[7],
diag[2]*mEntry[8]
);
}
//----------------------------------------------------------------------------
template <typename Real>
Matrix3<Real> Matrix3<Real>::Inverse (const Real epsilon) const
{
// Invert a 3x3 using cofactors. This is faster than using a generic
// Gaussian elimination because of the loop overhead of such a method.
Matrix3 inverse;
// Compute the adjoint.
inverse.mEntry[0] = mEntry[4]*mEntry[8] - mEntry[5]*mEntry[7];
inverse.mEntry[1] = mEntry[2]*mEntry[7] - mEntry[1]*mEntry[8];
inverse.mEntry[2] = mEntry[1]*mEntry[5] - mEntry[2]*mEntry[4];
inverse.mEntry[3] = mEntry[5]*mEntry[6] - mEntry[3]*mEntry[8];
inverse.mEntry[4] = mEntry[0]*mEntry[8] - mEntry[2]*mEntry[6];
inverse.mEntry[5] = mEntry[2]*mEntry[3] - mEntry[0]*mEntry[5];
inverse.mEntry[6] = mEntry[3]*mEntry[7] - mEntry[4]*mEntry[6];
inverse.mEntry[7] = mEntry[1]*mEntry[6] - mEntry[0]*mEntry[7];
inverse.mEntry[8] = mEntry[0]*mEntry[4] - mEntry[1]*mEntry[3];
Real det = mEntry[0]*inverse.mEntry[0] + mEntry[1]*inverse.mEntry[3] +
mEntry[2]*inverse.mEntry[6];
if (Math<Real>::FAbs(det) > epsilon)
{
Real invDet = ((Real)1)/det;
inverse.mEntry[0] *= invDet;
inverse.mEntry[1] *= invDet;
inverse.mEntry[2] *= invDet;
inverse.mEntry[3] *= invDet;
inverse.mEntry[4] *= invDet;
inverse.mEntry[5] *= invDet;
inverse.mEntry[6] *= invDet;
inverse.mEntry[7] *= invDet;
inverse.mEntry[8] *= invDet;
return inverse;
}
return ZERO;
}
//----------------------------------------------------------------------------
template <typename Real>
Matrix3<Real> Matrix3<Real>::Adjoint () const
{
return Matrix3<Real>
(
mEntry[4]*mEntry[8] - mEntry[5]*mEntry[7],
mEntry[2]*mEntry[7] - mEntry[1]*mEntry[8],
mEntry[1]*mEntry[5] - mEntry[2]*mEntry[4],
mEntry[5]*mEntry[6] - mEntry[3]*mEntry[8],
mEntry[0]*mEntry[8] - mEntry[2]*mEntry[6],
mEntry[2]*mEntry[3] - mEntry[0]*mEntry[5],
mEntry[3]*mEntry[7] - mEntry[4]*mEntry[6],
mEntry[1]*mEntry[6] - mEntry[0]*mEntry[7],
mEntry[0]*mEntry[4] - mEntry[1]*mEntry[3]
);
}
//----------------------------------------------------------------------------
template <typename Real>
Real Matrix3<Real>::Determinant () const
{
Real co00 = mEntry[4]*mEntry[8] - mEntry[5]*mEntry[7];
Real co10 = mEntry[5]*mEntry[6] - mEntry[3]*mEntry[8];
Real co20 = mEntry[3]*mEntry[7] - mEntry[4]*mEntry[6];
Real det = mEntry[0]*co00 + mEntry[1]*co10 + mEntry[2]*co20;
return det;
}
//----------------------------------------------------------------------------
template <typename Real>
void Matrix3<Real>::ExtractAxisAngle (Vector3<Real>& axis, Real& angle) const
{
// Let (x,y,z) be the unit-length axis and let A be an angle of rotation.
// The rotation matrix is R = I + sin(A)*P + (1-cos(A))*P^2 where
// I is the identity and
//
// +- -+
// P = | 0 -z +y |
// | +z 0 -x |
// | -y +x 0 |
// +- -+
//
// If A > 0, R represents a counterclockwise rotation about the axis in
// the sense of looking from the tip of the axis vector towards the
// origin. Some algebra will show that
//
// cos(A) = (trace(R)-1)/2 and R - R^t = 2*sin(A)*P
//
// In the event that A = pi, R-R^t = 0 which prevents us from extracting
// the axis through P. Instead note that R = I+2*P^2 when A = pi, so
// P^2 = (R-I)/2. The diagonal entries of P^2 are x^2-1, y^2-1, and
// z^2-1. We can solve these for axis (x,y,z). Because the angle is pi,
// it does not matter which sign you choose on the square roots.
Real trace = mEntry[0] + mEntry[4] + mEntry[8];
Real cs = ((Real)0.5)*(trace - (Real)1);
angle = Math<Real>::ACos(cs); // in [0,PI]
if (angle > (Real)0)
{
if (angle < Math<Real>::PI)
{
axis[0] = mEntry[7] - mEntry[5];
axis[1] = mEntry[2] - mEntry[6];
axis[2] = mEntry[3] - mEntry[1];
axis.Normalize();
}
else
{
// angle is PI
Real halfInverse;
if (mEntry[0] >= mEntry[4])
{
// r00 >= r11
if (mEntry[0] >= mEntry[8])
{
// r00 is maximum diagonal term
axis[0] = ((Real)0.5)*Math<Real>::Sqrt((Real)1
+ mEntry[0] - mEntry[4] - mEntry[8]);
halfInverse = ((Real)0.5)/axis[0];
axis[1] = halfInverse*mEntry[1];
axis[2] = halfInverse*mEntry[2];
}
else
{
// r22 is maximum diagonal term
axis[2] = ((Real)0.5)*Math<Real>::Sqrt((Real)1
+ mEntry[8] - mEntry[0] - mEntry[4]);
halfInverse = ((Real)0.5)/axis[2];
axis[0] = halfInverse*mEntry[2];
axis[1] = halfInverse*mEntry[5];
}
}
else
{
// r11 > r00
if (mEntry[4] >= mEntry[8])
{
// r11 is maximum diagonal term
axis[1] = ((Real)0.5)*Math<Real>::Sqrt((Real)1
+ mEntry[4] - mEntry[0] - mEntry[8]);
halfInverse = ((Real)0.5)/axis[1];
axis[0] = halfInverse*mEntry[1];
axis[2] = halfInverse*mEntry[5];
}
else
{
// r22 is maximum diagonal term
axis[2] = ((Real)0.5)*Math<Real>::Sqrt((Real)1
+ mEntry[8] - mEntry[0] - mEntry[4]);
halfInverse = ((Real)0.5)/axis[2];
axis[0] = halfInverse*mEntry[2];
axis[1] = halfInverse*mEntry[5];
}
}
}
}
else
{
// The angle is 0 and the matrix is the identity. Any axis will
// work, so just use the x-axis.
axis[0] = (Real)1;
axis[1] = (Real)0;
axis[2] = (Real)0;
}
}
//----------------------------------------------------------------------------
template <typename Real>
void Matrix3<Real>::Orthonormalize ()
{
// Algorithm uses Gram-Schmidt orthogonalization. If 'this' matrix is
// M = [m0|m1|m2], then orthonormal output matrix is Q = [q0|q1|q2],
//
// q0 = m0/|m0|
// q1 = (m1-(q0*m1)q0)/|m1-(q0*m1)q0|
// q2 = (m2-(q0*m2)q0-(q1*m2)q1)/|m2-(q0*m2)q0-(q1*m2)q1|
//
// where |V| indicates length of vector V and A*B indicates dot
// product of vectors A and B.
// Compute q0.
Real invLength = Math<Real>::InvSqrt(mEntry[0]*mEntry[0] +
mEntry[3]*mEntry[3] + mEntry[6]*mEntry[6]);
mEntry[0] *= invLength;
mEntry[3] *= invLength;
mEntry[6] *= invLength;
// Compute q1.
Real dot0 = mEntry[0]*mEntry[1] + mEntry[3]*mEntry[4] +
mEntry[6]*mEntry[7];
mEntry[1] -= dot0*mEntry[0];
mEntry[4] -= dot0*mEntry[3];
mEntry[7] -= dot0*mEntry[6];
invLength = Math<Real>::InvSqrt(mEntry[1]*mEntry[1] +
mEntry[4]*mEntry[4] + mEntry[7]*mEntry[7]);
mEntry[1] *= invLength;
mEntry[4] *= invLength;
mEntry[7] *= invLength;
// compute q2
Real dot1 = mEntry[1]*mEntry[2] + mEntry[4]*mEntry[5] +
mEntry[7]*mEntry[8];
dot0 = mEntry[0]*mEntry[2] + mEntry[3]*mEntry[5] +
mEntry[6]*mEntry[8];
mEntry[2] -= dot0*mEntry[0] + dot1*mEntry[1];
mEntry[5] -= dot0*mEntry[3] + dot1*mEntry[4];
mEntry[8] -= dot0*mEntry[6] + dot1*mEntry[7];
invLength = Math<Real>::InvSqrt(mEntry[2]*mEntry[2] +
mEntry[5]*mEntry[5] + mEntry[8]*mEntry[8]);
mEntry[2] *= invLength;
mEntry[5] *= invLength;
mEntry[8] *= invLength;
}
//----------------------------------------------------------------------------
template <typename Real>
void Matrix3<Real>::EigenDecomposition (Matrix3& rot, Matrix3& diag) const
{
// Factor M = R*D*R^T. The columns of R are the eigenvectors. The
// diagonal entries of D are the corresponding eigenvalues.
Real diagonal[3], subdiagonal[2];
rot = *this;
bool reflection = rot.Tridiagonalize(diagonal, subdiagonal);
bool converged = rot.QLAlgorithm(diagonal, subdiagonal);
assertion(converged, "QLAlgorithm failed to converge\n");
WM5_UNUSED(converged);
// Sort the eigenvalues in increasing order, d0 <= d1 <= d2. This is an
// insertion sort.
int i;
Real save;
if (diagonal[1] < diagonal[0])
{
// Swap d0 and d1.
save = diagonal[0];
diagonal[0] = diagonal[1];
diagonal[1] = save;
// Swap V0 and V1.
for (i = 0; i < 3; ++i)
{
save = rot[i][0];
rot[i][0] = rot[i][1];
rot[i][1] = save;
}
reflection = !reflection;
}
if (diagonal[2] < diagonal[1])
{
// Swap d1 and d2.
save = diagonal[1];
diagonal[1] = diagonal[2];
diagonal[2] = save;
// Swap V1 and V2.
for (i = 0; i < 3; ++i)
{
save = rot[i][1];
rot[i][1] = rot[i][2];
rot[i][2] = save;
}
reflection = !reflection;
}
if (diagonal[1] < diagonal[0])
{
// Swap d0 and d1.
save = diagonal[0];
diagonal[0] = diagonal[1];
diagonal[1] = save;
// Swap V0 and V1.
for (i = 0; i < 3; ++i)
{
save = rot[i][0];
rot[i][0] = rot[i][1];
rot[i][1] = save;
}
reflection = !reflection;
}
diag.MakeDiagonal(diagonal[0], diagonal[1], diagonal[2]);
if (reflection)
{
// The orthogonal transformation that diagonalizes M is a reflection.
// Make the eigenvectors a right-handed system by changing sign on
// the last column.
rot[0][2] = -rot[0][2];
rot[1][2] = -rot[1][2];
rot[2][2] = -rot[2][2];
}
}
//----------------------------------------------------------------------------
template <typename Real>
void Matrix3<Real>::MakeEulerXYZ (Real xAngle, Real yAngle, Real zAngle)
{
Real cs, sn;
cs = Math<Real>::Cos(xAngle);
sn = Math<Real>::Sin(xAngle);
Matrix3 xMat(
(Real)1, (Real)0, (Real)0,
(Real)0, cs, -sn,
(Real)0, sn, cs);
cs = Math<Real>::Cos(yAngle);
sn = Math<Real>::Sin(yAngle);
Matrix3 yMat(
cs, (Real)0, sn,
(Real)0, (Real)1, (Real)0,
-sn, (Real)0, cs);
cs = Math<Real>::Cos(zAngle);
sn = Math<Real>::Sin(zAngle);
Matrix3 zMat(
cs, -sn, (Real)0,
sn, cs, (Real)0,
(Real)0, (Real)0, (Real)1);
*this = xMat*(yMat*zMat);
}
//----------------------------------------------------------------------------
template <typename Real>
void Matrix3<Real>::MakeEulerXZY (Real xAngle, Real zAngle, Real yAngle)
{
Real cs, sn;
cs = Math<Real>::Cos(xAngle);
sn = Math<Real>::Sin(xAngle);
Matrix3 xMat(
(Real)1, (Real)0, (Real)0,
(Real)0, cs, -sn,
(Real)0, sn, cs);
cs = Math<Real>::Cos(zAngle);
sn = Math<Real>::Sin(zAngle);
Matrix3 zMat(
cs, -sn, (Real)0,
sn, cs, (Real)0,
(Real)0, (Real)0, (Real)1);
cs = Math<Real>::Cos(yAngle);
sn = Math<Real>::Sin(yAngle);
Matrix3 yMat(
cs, (Real)0, sn,
(Real)0, (Real)1, (Real)0,
-sn, (Real)0, cs);
*this = xMat*(zMat*yMat);
}
//----------------------------------------------------------------------------
template <typename Real>
void Matrix3<Real>::MakeEulerYXZ (Real yAngle, Real xAngle, Real zAngle)
{
Real cs, sn;
cs = Math<Real>::Cos(yAngle);
sn = Math<Real>::Sin(yAngle);
Matrix3 yMat(
cs, (Real)0, sn,
(Real)0, (Real)1, (Real)0,
-sn, (Real)0, cs);
cs = Math<Real>::Cos(xAngle);
sn = Math<Real>::Sin(xAngle);
Matrix3 xMat(
(Real)1, (Real)0, (Real)0,
(Real)0, cs, -sn,
(Real)0, sn, cs);
cs = Math<Real>::Cos(zAngle);
sn = Math<Real>::Sin(zAngle);
Matrix3 zMat(
cs, -sn, (Real)0,
sn, cs, (Real)0,
(Real)0, (Real)0, (Real)1);
*this = yMat*(xMat*zMat);
}
//----------------------------------------------------------------------------
template <typename Real>
void Matrix3<Real>::MakeEulerYZX (Real yAngle, Real zAngle, Real xAngle)
{
Real cs, sn;
cs = Math<Real>::Cos(yAngle);
sn = Math<Real>::Sin(yAngle);
Matrix3 yMat(
cs, (Real)0, sn,
(Real)0, (Real)1, (Real)0,
-sn, (Real)0, cs);
cs = Math<Real>::Cos(zAngle);
sn = Math<Real>::Sin(zAngle);
Matrix3 zMat(
cs, -sn, (Real)0,
sn, cs, (Real)0,
(Real)0, (Real)0, (Real)1);
cs = Math<Real>::Cos(xAngle);
sn = Math<Real>::Sin(xAngle);
Matrix3 xMat(
(Real)1,(Real)0,(Real)0,
(Real)0,cs,-sn,
(Real)0,sn,cs);
*this = yMat*(zMat*xMat);
}
//----------------------------------------------------------------------------
template <typename Real>
void Matrix3<Real>::MakeEulerZXY (Real zAngle, Real xAngle, Real yAngle)
{
Real cs, sn;
cs = Math<Real>::Cos(zAngle);
sn = Math<Real>::Sin(zAngle);
Matrix3 zMat(
cs, -sn, (Real)0,
sn, cs, (Real)0,
(Real)0, (Real)0, (Real)1);
cs = Math<Real>::Cos(xAngle);
sn = Math<Real>::Sin(xAngle);
Matrix3 xMat(
(Real)1, (Real)0, (Real)0,
(Real)0, cs, -sn,
(Real)0, sn, cs);
cs = Math<Real>::Cos(yAngle);
sn = Math<Real>::Sin(yAngle);
Matrix3 yMat(
cs, (Real)0, sn,
(Real)0, (Real)1, (Real)0,
-sn, (Real)0, cs);
*this = zMat*(xMat*yMat);
}
//----------------------------------------------------------------------------
template <typename Real>
void Matrix3<Real>::MakeEulerZYX (Real zAngle, Real yAngle, Real xAngle)
{
Real cs, sn;
cs = Math<Real>::Cos(zAngle);
sn = Math<Real>::Sin(zAngle);
Matrix3 zMat(
cs, -sn, (Real)0,
sn, cs, (Real)0,
(Real)0, (Real)0, (Real)1);
cs = Math<Real>::Cos(yAngle);
sn = Math<Real>::Sin(yAngle);
Matrix3 yMat(
cs, (Real)0, sn,
(Real)0, (Real)1, (Real)0,
-sn, (Real)0, cs);
cs = Math<Real>::Cos(xAngle);
sn = Math<Real>::Sin(xAngle);
Matrix3 xMat(
(Real)1, (Real)0, (Real)0,
(Real)0, cs, -sn,
(Real)0, sn, cs);
*this = zMat*(yMat*xMat);
}
//----------------------------------------------------------------------------
template <typename Real>
void Matrix3<Real>::MakeEulerXYX (Real x0Angle, Real yAngle, Real x1Angle)
{
Real cs, sn;
cs = Math<Real>::Cos(x0Angle);
sn = Math<Real>::Sin(x0Angle);
Matrix3 x0Mat(
(Real)1, (Real)0, (Real)0,
(Real)0, cs, -sn,
(Real)0, sn, cs);
cs = Math<Real>::Cos(yAngle);
sn = Math<Real>::Sin(yAngle);
Matrix3 yMat(
cs, (Real)0, sn,
(Real)0, (Real)1, (Real)0,
-sn, (Real)0, cs);
cs = Math<Real>::Cos(x1Angle);
sn = Math<Real>::Sin(x1Angle);
Matrix3 x1Mat(
(Real)1, (Real)0, (Real)0,
(Real)0, cs, -sn,
(Real)0, sn, cs);
*this = x0Mat*(yMat*x1Mat);
}
//----------------------------------------------------------------------------
template <typename Real>
void Matrix3<Real>::MakeEulerXZX (Real x0Angle, Real zAngle, Real x1Angle)
{
Real cs, sn;
cs = Math<Real>::Cos(x0Angle);
sn = Math<Real>::Sin(x0Angle);
Matrix3 x0Mat(
(Real)1, (Real)0, (Real)0,
(Real)0, cs, -sn,
(Real)0, sn, cs);
cs = Math<Real>::Cos(zAngle);
sn = Math<Real>::Sin(zAngle);
Matrix3 zMat(
cs, -sn, (Real)0,
sn, cs, (Real)0,
(Real)0, (Real)0, (Real)1);
cs = Math<Real>::Cos(x1Angle);
sn = Math<Real>::Sin(x1Angle);
Matrix3 x1Mat(
(Real)1, (Real)0, (Real)0,
(Real)0, cs, -sn,
(Real)0, sn, cs);
*this = x0Mat*(zMat*x1Mat);
}
//----------------------------------------------------------------------------
template <typename Real>
void Matrix3<Real>::MakeEulerYXY (Real y0Angle, Real xAngle, Real y1Angle)
{
Real cs, sn;
cs = Math<Real>::Cos(y0Angle);
sn = Math<Real>::Sin(y0Angle);
Matrix3 y0Mat(
cs, (Real)0, sn,
(Real)0, (Real)1, (Real)0,
-sn, (Real)0, cs);
cs = Math<Real>::Cos(xAngle);
sn = Math<Real>::Sin(xAngle);
Matrix3 xMat(
(Real)1, (Real)0, (Real)0,
(Real)0, cs, -sn,
(Real)0, sn, cs);
cs = Math<Real>::Cos(y1Angle);
sn = Math<Real>::Sin(y1Angle);
Matrix3 y1Mat(
cs, (Real)0, sn,
(Real)0, (Real)1, (Real)0,
-sn, (Real)0, cs);
*this = y0Mat*(xMat*y1Mat);
}
//----------------------------------------------------------------------------
template <typename Real>
void Matrix3<Real>::MakeEulerYZY (Real y0Angle, Real zAngle, Real y1Angle)
{
Real cs, sn;
cs = Math<Real>::Cos(y0Angle);
sn = Math<Real>::Sin(y0Angle);
Matrix3 y0Mat(
cs, (Real)0, sn,
(Real)0, (Real)1, (Real)0,
-sn, (Real)0, cs);
cs = Math<Real>::Cos(zAngle);
sn = Math<Real>::Sin(zAngle);
Matrix3 zMat(
cs, -sn, (Real)0,
sn, cs, (Real)0,
(Real)0, (Real)0, (Real)1);
cs = Math<Real>::Cos(y1Angle);
sn = Math<Real>::Sin(y1Angle);
Matrix3 y1Mat(
cs, (Real)0, sn,
(Real)0, (Real)1, (Real)0,
-sn, (Real)0, cs);
*this = y0Mat*(zMat*y1Mat);
}
//----------------------------------------------------------------------------
template <typename Real>
void Matrix3<Real>::MakeEulerZXZ (Real z0Angle, Real xAngle, Real z1Angle)
{
Real cs, sn;
cs = Math<Real>::Cos(z0Angle);
sn = Math<Real>::Sin(z0Angle);
Matrix3 z0Mat(
cs, -sn, (Real)0,
sn, cs, (Real)0,
(Real)0, (Real)0, (Real)1);
cs = Math<Real>::Cos(xAngle);
sn = Math<Real>::Sin(xAngle);
Matrix3 xMat(
(Real)1, (Real)0, (Real)0,
(Real)0, cs, -sn,
(Real)0, sn, cs);
cs = Math<Real>::Cos(z1Angle);
sn = Math<Real>::Sin(z1Angle);
Matrix3 z1Mat(
cs, -sn, (Real)0,
sn, cs, (Real)0,
(Real)0, (Real)0, (Real)1);
*this = z0Mat*(xMat*z1Mat);
}
//----------------------------------------------------------------------------
template <typename Real>
void Matrix3<Real>::MakeEulerZYZ (Real z0Angle, Real yAngle, Real z1Angle)
{
Real cs, sn;
cs = Math<Real>::Cos(z0Angle);
sn = Math<Real>::Sin(z0Angle);
Matrix3 z0Mat(
cs, -sn, (Real)0,
sn, cs, (Real)0,
(Real)0, (Real)0, (Real)1);
cs = Math<Real>::Cos(yAngle);
sn = Math<Real>::Sin(yAngle);
Matrix3 yMat(
cs, (Real)0, sn,
(Real)0, (Real)1, (Real)0,
-sn, (Real)0, cs);
cs = Math<Real>::Cos(z1Angle);
sn = Math<Real>::Sin(z1Angle);
Matrix3 z1Mat(
cs, -sn, (Real)0,
sn, cs, (Real)0,
(Real)0, (Real)0, (Real)1);
*this = z0Mat*(yMat*z1Mat);
}
//----------------------------------------------------------------------------
template <typename Real>
typename Matrix3<Real>::EulerResult Matrix3<Real>::ExtractEulerXYZ (
Real& xAngle, Real& yAngle, Real& zAngle) const
{
// +- -+ +- -+
// | r00 r01 r02 | | cy*cz -cy*sz sy |
// | r10 r11 r12 | = | cz*sx*sy+cx*sz cx*cz-sx*sy*sz -cy*sx |
// | r20 r21 r22 | | -cx*cz*sy+sx*sz cz*sx+cx*sy*sz cx*cy |
// +- -+ +- -+
if (mEntry[2] < (Real)1)
{
if (mEntry[2] > -(Real)1)
{
// y_angle = asin(r02)
// x_angle = atan2(-r12,r22)
// z_angle = atan2(-r01,r00)
yAngle = (Real)asin((double)mEntry[2]);
xAngle = Math<Real>::ATan2(-mEntry[5], mEntry[8]);
zAngle = Math<Real>::ATan2(-mEntry[1], mEntry[0]);
return EA_UNIQUE;
}
else
{
// y_angle = -pi/2
// z_angle - x_angle = atan2(r10,r11)
// WARNING. The solution is not unique. Choosing z_angle = 0.
yAngle = -Math<Real>::HALF_PI;
xAngle = -Math<Real>::ATan2(mEntry[3], mEntry[4]);
zAngle = (Real)0;
return EA_NOT_UNIQUE_DIF;
}
}
else
{
// y_angle = +pi/2
// z_angle + x_angle = atan2(r10,r11)
// WARNING. The solutions is not unique. Choosing z_angle = 0.
yAngle = Math<Real>::HALF_PI;
xAngle = Math<Real>::ATan2(mEntry[3], mEntry[4]);
zAngle = (Real)0;
return EA_NOT_UNIQUE_SUM;
}
}
//----------------------------------------------------------------------------
template <typename Real>
typename Matrix3<Real>::EulerResult Matrix3<Real>::ExtractEulerXZY (
Real& xAngle, Real& zAngle, Real& yAngle) const
{
// +- -+ +- -+
// | r00 r01 r02 | | cy*cz -sz cz*sy |
// | r10 r11 r12 | = | sx*sy+cx*cy*sz cx*cz -cy*sx+cx*sy*sz |
// | r20 r21 r22 | | -cx*sy+cy*sx*sz cz*sx cx*cy+sx*sy*sz |
// +- -+ +- -+
if (mEntry[1] < (Real)1)
{
if (mEntry[1] > -(Real)1)
{
// z_angle = asin(-r01)
// x_angle = atan2(r21,r11)
// y_angle = atan2(r02,r00)
zAngle = (Real)asin(-(double)mEntry[1]);
xAngle = Math<Real>::ATan2(mEntry[7], mEntry[4]);
yAngle = Math<Real>::ATan2(mEntry[2], mEntry[0]);
return EA_UNIQUE;
}
else
{
// z_angle = +pi/2
// y_angle - x_angle = atan2(-r20,r22)
// WARNING. The solution is not unique. Choosing y_angle = 0.
zAngle = Math<Real>::HALF_PI;
xAngle = -Math<Real>::ATan2(-mEntry[6] ,mEntry[8]);
yAngle = (Real)0;
return EA_NOT_UNIQUE_DIF;
}
}
else
{
// z_angle = -pi/2
// y_angle + x_angle = atan2(-r20,r22)
// WARNING. The solution is not unique. Choosing y_angle = 0.
zAngle = -Math<Real>::HALF_PI;
xAngle = Math<Real>::ATan2(-mEntry[6], mEntry[8]);
yAngle = (Real)0;
return EA_NOT_UNIQUE_SUM;
}
}
//----------------------------------------------------------------------------
template <typename Real>
typename Matrix3<Real>::EulerResult Matrix3<Real>::ExtractEulerYXZ (
Real& yAngle, Real& xAngle, Real& zAngle) const
{
// +- -+ +- -+
// | r00 r01 r02 | | cy*cz+sx*sy*sz cz*sx*sy-cy*sz cx*sy |
// | r10 r11 r12 | = | cx*sz cx*cz -sx |
// | r20 r21 r22 | | -cz*sy+cy*sx*sz cy*cz*sx+sy*sz cx*cy |
// +- -+ +- -+
if (mEntry[5] < (Real)1)
{
if (mEntry[5] > -(Real)1)
{
// x_angle = asin(-r12)
// y_angle = atan2(r02,r22)
// z_angle = atan2(r10,r11)
xAngle = (Real)asin(-(double)mEntry[5]);
yAngle = Math<Real>::ATan2(mEntry[2], mEntry[8]);
zAngle = Math<Real>::ATan2(mEntry[3], mEntry[4]);
return EA_UNIQUE;
}
else
{
// x_angle = +pi/2
// z_angle - y_angle = atan2(-r01,r00)
// WARNING. The solution is not unique. Choosing z_angle = 0.
xAngle = Math<Real>::HALF_PI;
yAngle = -Math<Real>::ATan2(-mEntry[1], mEntry[0]);
zAngle = (Real)0;
return EA_NOT_UNIQUE_DIF;
}
}
else
{
// x_angle = -pi/2
// z_angle + y_angle = atan2(-r01,r00)
// WARNING. The solution is not unique. Choosing z_angle = 0.
xAngle = -Math<Real>::HALF_PI;
yAngle = Math<Real>::ATan2(-mEntry[1], mEntry[0]);
zAngle = (Real)0;
return EA_NOT_UNIQUE_SUM;
}
}
//----------------------------------------------------------------------------
template <typename Real>
typename Matrix3<Real>::EulerResult Matrix3<Real>::ExtractEulerYZX (
Real& yAngle, Real& zAngle, Real& xAngle) const
{
// +- -+ +- -+
// | r00 r01 r02 | | cy*cz sx*sy-cx*cy*sz cx*sy+cy*sx*sz |
// | r10 r11 r12 | = | sz cx*cz -cz*sx |
// | r20 r21 r22 | | -cz*sy cy*sx+cx*sy*sz cx*cy-sx*sy*sz |
// +- -+ +- -+
if (mEntry[3] < (Real)1)
{
if (mEntry[3] > -(Real)1)
{
// z_angle = asin(r10)
// y_angle = atan2(-r20,r00)
// x_angle = atan2(-r12,r11)
zAngle = (Real)asin((double)mEntry[3]);
yAngle = Math<Real>::ATan2(-mEntry[6], mEntry[0]);
xAngle = Math<Real>::ATan2(-mEntry[5], mEntry[4]);
return EA_UNIQUE;
}
else
{
// z_angle = -pi/2
// x_angle - y_angle = atan2(r21,r22)
// WARNING. The solution is not unique. Choosing x_angle = 0.
zAngle = -Math<Real>::HALF_PI;
yAngle = -Math<Real>::ATan2(mEntry[7], mEntry[8]);
xAngle = (Real)0;
return EA_NOT_UNIQUE_DIF;
}
}
else
{
// z_angle = +pi/2
// x_angle + y_angle = atan2(r21,r22)
// WARNING. The solution is not unique. Choosing x_angle = 0.
zAngle = Math<Real>::HALF_PI;
yAngle = Math<Real>::ATan2(mEntry[7], mEntry[8]);
xAngle = (Real)0;
return EA_NOT_UNIQUE_SUM;
}
}
//----------------------------------------------------------------------------
template <typename Real>
typename Matrix3<Real>::EulerResult Matrix3<Real>::ExtractEulerZXY (
Real& zAngle, Real& xAngle, Real& yAngle) const
{
// +- -+ +- -+
// | r00 r01 r02 | | cy*cz-sx*sy*sz -cx*sz cz*sy+cy*sx*sz |
// | r10 r11 r12 | = | cz*sx*sy+cy*sz cx*cz -cy*cz*sx+sy*sz |
// | r20 r21 r22 | | -cx*sy sx cx*cy |
// +- -+ +- -+
if (mEntry[7] < (Real)1)
{
if (mEntry[7] > -(Real)1)
{
// x_angle = asin(r21)
// z_angle = atan2(-r01,r11)
// y_angle = atan2(-r20,r22)
xAngle = (Real)asin((double)mEntry[7]);
zAngle = Math<Real>::ATan2(-mEntry[1], mEntry[4]);
yAngle = Math<Real>::ATan2(-mEntry[6], mEntry[8]);
return EA_UNIQUE;
}
else
{
// x_angle = -pi/2
// y_angle - z_angle = atan2(r02,r00)
// WARNING. The solution is not unique. Choosing y_angle = 0.
xAngle = -Math<Real>::HALF_PI;
zAngle = -Math<Real>::ATan2(mEntry[2], mEntry[0]);
yAngle = (Real)0;
return EA_NOT_UNIQUE_DIF;
}
}
else
{
// x_angle = +pi/2
// y_angle + z_angle = atan2(r02,r00)
// WARNING. The solution is not unique. Choosing y_angle = 0.
xAngle = Math<Real>::HALF_PI;
zAngle = Math<Real>::ATan2(mEntry[2], mEntry[0]);
yAngle = (Real)0;
return EA_NOT_UNIQUE_SUM;
}
}
//----------------------------------------------------------------------------
template <typename Real>
typename Matrix3<Real>::EulerResult Matrix3<Real>::ExtractEulerZYX (
Real& zAngle, Real& yAngle, Real& xAngle) const
{
// +- -+ +- -+
// | r00 r01 r02 | | cy*cz cz*sx*sy-cx*sz cx*cz*sy+sx*sz |
// | r10 r11 r12 | = | cy*sz cx*cz+sx*sy*sz -cz*sx+cx*sy*sz |
// | r20 r21 r22 | | -sy cy*sx cx*cy |
// +- -+ +- -+
if (mEntry[6] < (Real)1)
{
if (mEntry[6] > -(Real)1)
{
// y_angle = asin(-r20)
// z_angle = atan2(r10,r00)
// x_angle = atan2(r21,r22)
yAngle = (Real)asin(-(double)mEntry[6]);
zAngle = Math<Real>::ATan2(mEntry[3], mEntry[0]);
xAngle = Math<Real>::ATan2(mEntry[7], mEntry[8]);
return EA_UNIQUE;
}
else
{
// y_angle = +pi/2
// x_angle - z_angle = atan2(r01,r02)
// WARNING. The solution is not unique. Choosing x_angle = 0.
yAngle = Math<Real>::HALF_PI;
zAngle = -Math<Real>::ATan2(mEntry[1], mEntry[2]);
xAngle = (Real)0;
return EA_NOT_UNIQUE_DIF;
}
}
else
{
// y_angle = -pi/2
// x_angle + z_angle = atan2(-r01,-r02)
// WARNING. The solution is not unique. Choosing x_angle = 0;
yAngle = -Math<Real>::HALF_PI;
zAngle = Math<Real>::ATan2(-mEntry[1], -mEntry[2]);
xAngle = (Real)0;
return EA_NOT_UNIQUE_SUM;
}
}
//----------------------------------------------------------------------------
template <typename Real>
typename Matrix3<Real>::EulerResult Matrix3<Real>::ExtractEulerXYX (
Real& x0Angle, Real& yAngle, Real& x1Angle) const
{
// +- -+ +- -+
// | r00 r01 r02 | | cy sy*sx1 sy*cx1 |
// | r10 r11 r12 | = | sy*sx0 cx0*cx1-cy*sx0*sx1 -cy*cx1*sx0-cx0*sx1 |
// | r20 r21 r22 | | -sy*cx0 cx1*sx0+cy*cx0*sx1 cy*cx0*cx1-sx0*sx1 |
// +- -+ +- -+
if (mEntry[0] < (Real)1)
{
if (mEntry[0] > -(Real)1)
{
// y_angle = acos(r00)
// x0_angle = atan2(r10,-r20)
// x1_angle = atan2(r01,r02)
yAngle = (Real)acos((double)mEntry[0]);
x0Angle = Math<Real>::ATan2(mEntry[3], -mEntry[6]);
x1Angle = Math<Real>::ATan2(mEntry[1], mEntry[2]);
return EA_UNIQUE;
}
else
{
// Not a unique solution: x1_angle - x0_angle = atan2(-r12,r11)
yAngle = Math<Real>::PI;
x0Angle = -Math<Real>::ATan2(-mEntry[5], mEntry[4]);
x1Angle = (Real)0;
return EA_NOT_UNIQUE_DIF;
}
}
else
{
// Not a unique solution: x1_angle + x0_angle = atan2(-r12,r11)
yAngle = (Real)0;
x0Angle = Math<Real>::ATan2(-mEntry[5], mEntry[4]);
x1Angle = (Real)0;
return EA_NOT_UNIQUE_SUM;
}
}
//----------------------------------------------------------------------------
template <typename Real>
typename Matrix3<Real>::EulerResult Matrix3<Real>::ExtractEulerXZX (
Real& x0Angle, Real& zAngle, Real& x1Angle) const
{
// +- -+ +- -+
// | r00 r01 r02 | | cz -sz*cx1 sz*sx1 |
// | r10 r11 r12 | = | sz*cx0 cz*cx0*cx1-sx0*sx1 -cx1*sx0-cz*cx0*sx1 |
// | r20 r21 r22 | | sz*sx0 cz*cx1*sx0+cx0*sx1 cx0*cx1-cz*sx0*sx1 |
// +- -+ +- -+
if (mEntry[0] < (Real)1)
{
if (mEntry[0] > -(Real)1)
{
// z_angle = acos(r00)
// x0_angle = atan2(r20,r10)
// x1_angle = atan2(r02,-r01)
zAngle = (Real)acos((double)mEntry[0]);
x0Angle = Math<Real>::ATan2(mEntry[6], mEntry[3]);
x1Angle = Math<Real>::ATan2(mEntry[2], -mEntry[1]);
return EA_UNIQUE;
}
else
{
// Not a unique solution: x1_angle - x0_angle = atan2(r21,r22)
zAngle = Math<Real>::PI;
x0Angle = -Math<Real>::ATan2(mEntry[7], mEntry[8]);
x1Angle = (Real)0;
return EA_NOT_UNIQUE_DIF;
}
}
else
{
// Not a unique solution: x1_angle + x0_angle = atan2(r21,r22)
zAngle = (Real)0;
x0Angle = Math<Real>::ATan2(mEntry[7], mEntry[8]);
x1Angle = (Real)0;
return EA_NOT_UNIQUE_SUM;
}
}
//----------------------------------------------------------------------------
template <typename Real>
typename Matrix3<Real>::EulerResult Matrix3<Real>::ExtractEulerYXY (
Real& y0Angle, Real& xAngle, Real& y1Angle) const
{
// +- -+ +- -+
// | r00 r01 r02 | | cy0*cy1-cx*sy0*sy1 sx*sy0 cx*cy1*sy0+cy0*sy1 |
// | r10 r11 r12 | = | sx*sy1 cx -sx*cy1 |
// | r20 r21 r22 | | -cy1*sy0-cx*cy0*sy1 sx*cy0 cx*cy0*cy1-sy0*sy1 |
// +- -+ +- -+
if (mEntry[4] < (Real)1)
{
if (mEntry[4] > -(Real)1)
{
// x_angle = acos(r11)
// y0_angle = atan2(r01,r21)
// y1_angle = atan2(r10,-r12)
xAngle = (Real)acos((double)mEntry[4]);
y0Angle = Math<Real>::ATan2(mEntry[1], mEntry[7]);
y1Angle = Math<Real>::ATan2(mEntry[3], -mEntry[5]);
return EA_UNIQUE;
}
else
{
// Not a unique solution: y1_angle - y0_angle = atan2(r02,r00)
xAngle = Math<Real>::PI;
y0Angle = -Math<Real>::ATan2(mEntry[2], mEntry[0]);
y1Angle = (Real)0;
return EA_NOT_UNIQUE_DIF;
}
}
else
{
// Not a unique solution: y1_angle + y0_angle = atan2(r02,r00)
xAngle = (Real)0;
y0Angle = Math<Real>::ATan2(mEntry[2], mEntry[0]);
y1Angle = (Real)0;
return EA_NOT_UNIQUE_SUM;
}
}
//----------------------------------------------------------------------------
template <typename Real>
typename Matrix3<Real>::EulerResult Matrix3<Real>::ExtractEulerYZY (
Real& y0Angle, Real& zAngle, Real& y1Angle) const
{
// +- -+ +- -+
// | r00 r01 r02 | | cz*cy0*cy1-sy0*sy1 -sz*cy0 cy1*sy0+cz*cy0*sy1 |
// | r10 r11 r12 | = | sz*cy1 cz sz*sy1 |
// | r20 r21 r22 | | -cz*cy1*sy0-cy0*sy1 sz*sy0 cy0*cy1-cz*sy0*sy1 |
// +- -+ +- -+
if (mEntry[4] < (Real)1)
{
if (mEntry[4] > -(Real)1)
{
// z_angle = acos(r11)
// y0_angle = atan2(r21,-r01)
// y1_angle = atan2(r12,r10)
zAngle = (Real)acos((double)mEntry[4]);
y0Angle = Math<Real>::ATan2(mEntry[7], -mEntry[1]);
y1Angle = Math<Real>::ATan2(mEntry[5], mEntry[3]);
return EA_UNIQUE;
}
else
{
// Not a unique solution: y1_angle - y0_angle = atan2(-r20,r22)
zAngle = Math<Real>::PI;
y0Angle = -Math<Real>::ATan2(-mEntry[6], mEntry[8]);
y1Angle = (Real)0;
return EA_NOT_UNIQUE_DIF;
}
}
else
{
// Not a unique solution: y1_angle + y0_angle = atan2(-r20,r22)
zAngle = (Real)0;
y0Angle = Math<Real>::ATan2(-mEntry[6], mEntry[8]);
y1Angle = (Real)0;
return EA_NOT_UNIQUE_SUM;
}
}
//----------------------------------------------------------------------------
template <typename Real>
typename Matrix3<Real>::EulerResult Matrix3<Real>::ExtractEulerZXZ (
Real& z0Angle, Real& xAngle, Real& z1Angle) const
{
// +- -+ +- -+
// | r00 r01 r02 | | cz0*cz1-cx*sz0*sz1 -cx*cz1*sz0-cz0*sz1 sx*sz0 |
// | r10 r11 r12 | = | cz1*sz0+cx*cz0*sz1 cx*cz0*cz1-sz0*sz1 -sz*cz0 |
// | r20 r21 r22 | | sx*sz1 sx*cz1 cx |
// +- -+ +- -+
if (mEntry[8] < (Real)1)
{
if (mEntry[8] > -(Real)1)
{
// x_angle = acos(r22)
// z0_angle = atan2(r02,-r12)
// z1_angle = atan2(r20,r21)
xAngle = (Real)acos((double)mEntry[8]);
z0Angle = Math<Real>::ATan2(mEntry[2], -mEntry[5]);
z1Angle = Math<Real>::ATan2(mEntry[6], mEntry[7]);
return EA_UNIQUE;
}
else
{
// Not a unique solution: z1_angle - z0_angle = atan2(-r01,r00)
xAngle = Math<Real>::PI;
z0Angle = -Math<Real>::ATan2(-mEntry[1], mEntry[0]);
z1Angle = (Real)0;
return EA_NOT_UNIQUE_DIF;
}
}
else
{
// Not a unique solution: z1_angle + z0_angle = atan2(-r01,r00)
xAngle = (Real)0;
z0Angle = Math<Real>::ATan2(-mEntry[1], mEntry[0]);
z1Angle = (Real)0;
return EA_NOT_UNIQUE_SUM;
}
}
//----------------------------------------------------------------------------
template <typename Real>
typename Matrix3<Real>::EulerResult Matrix3<Real>::ExtractEulerZYZ (
Real& z0Angle, Real& yAngle, Real& z1Angle) const
{
// +- -+ +- -+
// | r00 r01 r02 | | cy*cz0*cz1-sz0*sz1 -cz1*sz0-cy*cz0*sz1 sy*cz0 |
// | r10 r11 r12 | = | cy*cz1*sz0+cz0*sz1 cz0*cz1-cy*sz0*sz1 sy*sz0 |
// | r20 r21 r22 | | -sy*cz1 sy*sz1 cy |
// +- -+ +- -+
if (mEntry[8] < (Real)1)
{
if (mEntry[8] > -(Real)1)
{
// y_angle = acos(r22)
// z0_angle = atan2(r12,r02)
// z1_angle = atan2(r21,-r20)
yAngle = (Real)acos((double)mEntry[8]);
z0Angle = Math<Real>::ATan2(mEntry[5], mEntry[2]);
z1Angle = Math<Real>::ATan2(mEntry[7], -mEntry[6]);
return EA_UNIQUE;
}
else // r22 = -1
{
// Not a unique solution: z1_angle - z0_angle = atan2(r10,r11)
yAngle = Math<Real>::PI;
z0Angle = -Math<Real>::ATan2(mEntry[3], mEntry[4]);
z1Angle = (Real)0;
return EA_NOT_UNIQUE_DIF;
}
}
else // r22 = +1
{
// Not a unique solution: z1_angle + z0_angle = atan2(r10,r11)
yAngle = (Real)0;
z0Angle = Math<Real>::ATan2(mEntry[3], mEntry[4]);
z1Angle = (Real)0;
return EA_NOT_UNIQUE_SUM;
}
}
//----------------------------------------------------------------------------
template <typename Real>
Matrix3<Real>& Matrix3<Real>::Slerp (Real t, const Matrix3& rot0,
const Matrix3& rot1)
{
Vector3<Real> axis;
Real angle;
Matrix3 prod = rot0.TransposeTimes(rot1);
prod.ExtractAxisAngle(axis, angle);
MakeRotation(axis, t*angle);
*this = rot0*(*this);
return *this;
}
//----------------------------------------------------------------------------
template <typename Real>
void Matrix3<Real>::SingularValueDecomposition (Matrix3& left,
Matrix3& diag, Matrix3& rightTranspose) const
{
// TODO. Replace by a call to EigenDecomposition and a QR factorization
// that is specialized for 3x3. The QDUDecomposition appears to assume
// the input matrix is invertible, but a general QR factorization has to
// deal with non-full rank.
GMatrix<Real> M(3, 3);
memcpy(M.GetElements(), mEntry, 9*sizeof(Real));
GMatrix<Real> tmpL(3, 3), tmpD(3, 3), tmpRTranspose(3, 3);
Wm5::SingularValueDecomposition<Real>(M, tmpL, tmpD, tmpRTranspose);
memcpy(left.mEntry, tmpL.GetElements(), 9*sizeof(Real));
memcpy(diag.mEntry, tmpD.GetElements(), 9*sizeof(Real));
memcpy(rightTranspose.mEntry, tmpRTranspose.GetElements(), 9*sizeof(Real));
}
//----------------------------------------------------------------------------
template <typename Real>
void Matrix3<Real>::PolarDecomposition (Matrix3& qMat, Matrix3& sMat)
{
// Decompose M = L*D*R^T.
Matrix3 left, diag, rightTranspose;
SingularValueDecomposition(left, diag, rightTranspose);
// Compute Q = L*R^T.
qMat = left*rightTranspose;
// Compute S = R*D*R^T.
sMat = rightTranspose.TransposeTimes(diag*rightTranspose);
// Numerical round-off errors can cause S not to be symmetric in the
// sense that S[i][j] and S[j][i] are slightly different for i != j.
// Correct this by averaging S = (S + S^T)/2.
sMat[0][1] = ((Real)0.5)*(sMat[0][1] + sMat[1][0]);
sMat[1][0] = sMat[0][1];
sMat[0][2] = ((Real)0.5)*(sMat[0][2] + sMat[2][0]);
sMat[2][0] = sMat[0][2];
sMat[1][2] = ((Real)0.5)*(sMat[1][2] + sMat[2][1]);
sMat[2][1] = sMat[1][2];
}
//----------------------------------------------------------------------------
template <typename Real>
void Matrix3<Real>::QDUDecomposition (Matrix3& qMat, Matrix3& diag,
Matrix3& uMat) const
{
// Factor M = QR = QDU where Q is orthogonal (rotation), D is diagonal
// (scaling), and U is upper triangular with ones on its diagonal
// (shear). Algorithm uses Gram-Schmidt orthogonalization (the QR
// algorithm).
//
// If M = [ m0 | m1 | m2 ] and Q = [ q0 | q1 | q2 ], then
//
// q0 = m0/|m0|
// q1 = (m1-(q0*m1)q0)/|m1-(q0*m1)q0|
// q2 = (m2-(q0*m2)q0-(q1*m2)q1)/|m2-(q0*m2)q0-(q1*m2)q1|
//
// where |V| indicates length of vector V and A*B indicates dot
// product of vectors A and B. The matrix R has entries
//
// r00 = q0*m0 r01 = q0*m1 r02 = q0*m2
// r10 = 0 r11 = q1*m1 r12 = q1*m2
// r20 = 0 r21 = 0 r22 = q2*m2
//
// so D = diag(r00,r11,r22) and U has entries u01 = r01/r00,
// u02 = r02/r00, and u12 = r12/r11.
// Build orthogonal matrix Q.
Real invLength = Math<Real>::InvSqrt(mEntry[0]*mEntry[0] +
mEntry[3]*mEntry[3] + mEntry[6]*mEntry[6]);
qMat[0][0] = mEntry[0]*invLength;
qMat[1][0] = mEntry[3]*invLength;
qMat[2][0] = mEntry[6]*invLength;
Real fDot = qMat[0][0]*mEntry[1] + qMat[1][0]*mEntry[4] +
qMat[2][0]*mEntry[7];
qMat[0][1] = mEntry[1]-fDot*qMat[0][0];
qMat[1][1] = mEntry[4]-fDot*qMat[1][0];
qMat[2][1] = mEntry[7]-fDot*qMat[2][0];
invLength = Math<Real>::InvSqrt(qMat[0][1]*qMat[0][1] +
qMat[1][1]*qMat[1][1] + qMat[2][1]*qMat[2][1]);
qMat[0][1] *= invLength;
qMat[1][1] *= invLength;
qMat[2][1] *= invLength;
fDot = qMat[0][0]*mEntry[2] + qMat[1][0]*mEntry[5] +
qMat[2][0]*mEntry[8];
qMat[0][2] = mEntry[2]-fDot*qMat[0][0];
qMat[1][2] = mEntry[5]-fDot*qMat[1][0];
qMat[2][2] = mEntry[8]-fDot*qMat[2][0];
fDot = qMat[0][1]*mEntry[2] + qMat[1][1]*mEntry[5] +
qMat[2][1]*mEntry[8];
qMat[0][2] -= fDot*qMat[0][1];
qMat[1][2] -= fDot*qMat[1][1];
qMat[2][2] -= fDot*qMat[2][1];
invLength = Math<Real>::InvSqrt(qMat[0][2]*qMat[0][2] +
qMat[1][2]*qMat[1][2] + qMat[2][2]*qMat[2][2]);
qMat[0][2] *= invLength;
qMat[1][2] *= invLength;
qMat[2][2] *= invLength;
// Guarantee that orthogonal matrix has determinant 1 (no reflections).
Real det =
qMat[0][0]*qMat[1][1]*qMat[2][2] + qMat[0][1]*qMat[1][2]*qMat[2][0] +
qMat[0][2]*qMat[1][0]*qMat[2][1] - qMat[0][2]*qMat[1][1]*qMat[2][0] -
qMat[0][1]*qMat[1][0]*qMat[2][2] - qMat[0][0]*qMat[1][2]*qMat[2][1];
if (det < (Real)0)
{
for (int row = 0; row < 3; ++row)
{
for (int col = 0; col < 3; ++col)
{
qMat[row][col] = -qMat[row][col];
}
}
}
// Build "right" matrix R.
Matrix3 right;
right[0][0] = qMat[0][0]*mEntry[0] + qMat[1][0]*mEntry[3] +
qMat[2][0]*mEntry[6];
right[0][1] = qMat[0][0]*mEntry[1] + qMat[1][0]*mEntry[4] +
qMat[2][0]*mEntry[7];
right[1][1] = qMat[0][1]*mEntry[1] + qMat[1][1]*mEntry[4] +
qMat[2][1]*mEntry[7];
right[0][2] = qMat[0][0]*mEntry[2] + qMat[1][0]*mEntry[5] +
qMat[2][0]*mEntry[8];
right[1][2] = qMat[0][1]*mEntry[2] + qMat[1][1]*mEntry[5] +
qMat[2][1]*mEntry[8];
right[2][2] = qMat[0][2]*mEntry[2] + qMat[1][2]*mEntry[5] +
qMat[2][2]*mEntry[8];
// The scaling component.
diag.MakeDiagonal(right[0][0], right[1][1], right[2][2]);
// the shear component
Real invD00 = ((Real)1)/diag[0][0];
uMat[0][0] = (Real)1;
uMat[0][1] = right[0][1]*invD00;
uMat[0][2] = right[0][2]*invD00;
uMat[1][0] = (Real)0;
uMat[1][1] = (Real)1;
uMat[1][2] = right[1][2]/diag[1][1];
uMat[2][0] = (Real)0;
uMat[2][1] = (Real)0;
uMat[2][2] = (Real)1;
}
//----------------------------------------------------------------------------
template <typename Real>
bool Matrix3<Real>::Tridiagonalize (Real diagonal[3], Real subdiagonal[2])
{
// Householder reduction T = Q^t M Q
// Input:
// mat, symmetric 3x3 matrix M
// Output:
// mat, orthogonal matrix Q (a reflection)
// diag, diagonal entries of T
// subd, subdiagonal entries of T (T is symmetric)
Real m00 = mEntry[0];
Real m01 = mEntry[1];
Real m02 = mEntry[2];
Real m11 = mEntry[4];
Real m12 = mEntry[5];
Real m22 = mEntry[8];
diagonal[0] = m00;
if (Math<Real>::FAbs(m02) >= Math<Real>::ZERO_TOLERANCE)
{
subdiagonal[0] = Math<Real>::Sqrt(m01*m01 + m02*m02);
Real invLength = ((Real)1)/subdiagonal[0];
m01 *= invLength;
m02 *= invLength;
Real tmp = ((Real)2)*m01*m12 + m02*(m22 - m11);
diagonal[1] = m11 + m02*tmp;
diagonal[2] = m22 - m02*tmp;
subdiagonal[1] = m12 - m01*tmp;
mEntry[0] = (Real)1;
mEntry[1] = (Real)0;
mEntry[2] = (Real)0;
mEntry[3] = (Real)0;
mEntry[4] = m01;
mEntry[5] = m02;
mEntry[6] = (Real)0;
mEntry[7] = m02;
mEntry[8] = -m01;
return true;
}
else
{
diagonal[1] = m11;
diagonal[2] = m22;
subdiagonal[0] = m01;
subdiagonal[1] = m12;
mEntry[0] = (Real)1;
mEntry[1] = (Real)0;
mEntry[2] = (Real)0;
mEntry[3] = (Real)0;
mEntry[4] = (Real)1;
mEntry[5] = (Real)0;
mEntry[6] = (Real)0;
mEntry[7] = (Real)0;
mEntry[8] = (Real)1;
return false;
}
}
//----------------------------------------------------------------------------
template <typename Real>
bool Matrix3<Real>::QLAlgorithm (Real diagonal[3], Real subdiagonal[2])
{
// This is an implementation of the symmetric QR algorithm from the book
// "Matrix Computations" by Gene H. Golub and Charles F. Van Loan,
// second edition. The algorithm is 8.2.3. The implementation has a
// slight variation to actually make it a QL algorithm, and it traps the
// case when either of the subdiagonal terms s0 or s1 is zero and reduces
// the 2-by-2 subblock directly.
const int imax = 32;
for (int i = 0; i < imax; ++i)
{
Real sum, diff, discr, eigVal0, eigVal1, cs, sn, tmp;
int row;
sum = Math<Real>::FAbs(diagonal[0]) + Math<Real>::FAbs(diagonal[1]);
if (Math<Real>::FAbs(subdiagonal[0]) + sum == sum)
{
// The matrix is effectively
// +- -+
// M = | d0 0 0 |
// | 0 d1 s1 |
// | 0 s1 d2 |
// +- -+
// Test whether M is diagonal (within numerical round-off).
sum = Math<Real>::FAbs(diagonal[1]) +
Math<Real>::FAbs(diagonal[2]);
if (Math<Real>::FAbs(subdiagonal[1]) + sum == sum)
{
return true;
}
// Compute the eigenvalues as roots of a quadratic equation.
sum = diagonal[1] + diagonal[2];
diff = diagonal[1] - diagonal[2];
discr = Math<Real>::Sqrt(diff*diff +
((Real)4)*subdiagonal[1]*subdiagonal[1]);
eigVal0 = ((Real)0.5)*(sum - discr);
eigVal1 = ((Real)0.5)*(sum + discr);
// Compute the Givens rotation.
if (diff >= (Real)0)
{
cs = subdiagonal[1];
sn = diagonal[1] - eigVal0;
}
else
{
cs = diagonal[2] - eigVal0;
sn = subdiagonal[1];
}
tmp = Math<Real>::InvSqrt(cs*cs + sn*sn);
cs *= tmp;
sn *= tmp;
// Postmultiply the current orthogonal matrix with the Givens
// rotation.
for (row = 0; row < 3; ++row)
{
tmp = mEntry[2+3*row];
mEntry[2+3*row] = sn*mEntry[1+3*row] + cs*tmp;
mEntry[1+3*row] = cs*mEntry[1+3*row] - sn*tmp;
}
// Update the tridiagonal matrix.
diagonal[1] = eigVal0;
diagonal[2] = eigVal1;
subdiagonal[0] = (Real)0;
subdiagonal[1] = (Real)0;
return true;
}
sum = Math<Real>::FAbs(diagonal[1]) + Math<Real>::FAbs(diagonal[2]);
if (Math<Real>::FAbs(subdiagonal[1]) + sum == sum)
{
// The matrix is effectively
// +- -+
// M = | d0 s0 0 |
// | s0 d1 0 |
// | 0 0 d2 |
// +- -+
// Test whether M is diagonal (within numerical round-off).
sum = Math<Real>::FAbs(diagonal[0]) +
Math<Real>::FAbs(diagonal[1]);
if (Math<Real>::FAbs(subdiagonal[0]) + sum == sum)
{
return true;
}
// Compute the eigenvalues as roots of a quadratic equation.
sum = diagonal[0] + diagonal[1];
diff = diagonal[0] - diagonal[1];
discr = Math<Real>::Sqrt(diff*diff +
((Real)4.0)*subdiagonal[0]*subdiagonal[0]);
eigVal0 = ((Real)0.5)*(sum - discr);
eigVal1 = ((Real)0.5)*(sum + discr);
// Compute the Givens rotation.
if (diff >= (Real)0)
{
cs = subdiagonal[0];
sn = diagonal[0] - eigVal0;
}
else
{
cs = diagonal[1] - eigVal0;
sn = subdiagonal[0];
}
tmp = Math<Real>::InvSqrt(cs*cs + sn*sn);
cs *= tmp;
sn *= tmp;
// Postmultiply the current orthogonal matrix with the Givens
// rotation.
for (row = 0; row < 3; ++row)
{
tmp = mEntry[1+3*row];
mEntry[1+3*row] = sn*mEntry[0+3*row] + cs*tmp;
mEntry[0+3*row] = cs*mEntry[0+3*row] - sn*tmp;
}
// Update the tridiagonal matrix.
diagonal[0] = eigVal0;
diagonal[1] = eigVal1;
subdiagonal[0] = (Real)0;
subdiagonal[1] = (Real)0;
return true;
}
// The matrix is
// +- -+
// M = | d0 s0 0 |
// | s0 d1 s1 |
// | 0 s1 d2 |
// +- -+
// Set up the parameters for the first pass of the QL step. The
// value for A is the difference between diagonal term D[2] and the
// implicit shift suggested by Wilkinson.
Real ratio = (diagonal[1] - diagonal[0])/(((Real)2)*subdiagonal[0]);
Real root = Math<Real>::Sqrt((Real)1 + ratio*ratio);
Real b = subdiagonal[1];
Real a = diagonal[2] - diagonal[0];
if (ratio >= (Real)0)
{
a += subdiagonal[0]/(ratio + root);
}
else
{
a += subdiagonal[0]/(ratio - root);
}
// Compute the Givens rotation for the first pass.
if (Math<Real>::FAbs(b) >= Math<Real>::FAbs(a))
{
ratio = a/b;
sn = Math<Real>::InvSqrt((Real)1 + ratio*ratio);
cs = ratio*sn;
}
else
{
ratio = b/a;
cs = Math<Real>::InvSqrt((Real)1 + ratio*ratio);
sn = ratio*cs;
}
// Postmultiply the current orthogonal matrix with the Givens
// rotation.
for (row = 0; row < 3; ++row)
{
tmp = mEntry[2+3*row];
mEntry[2+3*row] = sn*mEntry[1+3*row] + cs*tmp;
mEntry[1+3*row] = cs*mEntry[1+3*row] - sn*tmp;
}
// Set up the parameters for the second pass of the QL step. The
// values tmp0 and tmp1 are required to fully update the tridiagonal
// matrix at the end of the second pass.
Real tmp0 = (diagonal[1] - diagonal[2])*sn +
((Real)2)*subdiagonal[1]*cs;
Real tmp1 = cs*subdiagonal[0];
b = sn*subdiagonal[0];
a = cs*tmp0 - subdiagonal[1];
tmp0 *= sn;
// Compute the Givens rotation for the second pass. The subdiagonal
// term S[1] in the tridiagonal matrix is updated at this time.
if (Math<Real>::FAbs(b) >= Math<Real>::FAbs(a))
{
ratio = a/b;
root = Math<Real>::Sqrt((Real)1 + ratio*ratio);
subdiagonal[1] = b*root;
sn = ((Real)1)/root;
cs = ratio*sn;
}
else
{
ratio = b/a;
root = Math<Real>::Sqrt((Real)1 + ratio*ratio);
subdiagonal[1] = a*root;
cs = ((Real)1)/root;
sn = ratio*cs;
}
// Postmultiply the current orthogonal matrix with the Givens
// rotation.
for (row = 0; row < 3; ++row)
{
tmp = mEntry[1+3*row];
mEntry[1+3*row] = sn*mEntry[0+3*row] + cs*tmp;
mEntry[0+3*row] = cs*mEntry[0+3*row] - sn*tmp;
}
// Complete the update of the tridiagonal matrix.
Real tmp2 = diagonal[1] - tmp0;
diagonal[2] += tmp0;
tmp0 = (diagonal[0] - tmp2)*sn + ((Real)2)*tmp1*cs;
subdiagonal[0] = cs*tmp0 - tmp1;
tmp0 *= sn;
diagonal[1] = tmp2 + tmp0;
diagonal[0] -= tmp0;
}
return false;
}
//----------------------------------------------------------------------------
template <typename Real>
inline Matrix3<Real> operator* (Real scalar, const Matrix3<Real>& mat)
{
return mat*scalar;
}
//----------------------------------------------------------------------------
template <typename Real>
inline Vector3<Real> operator* (const Vector3<Real>& vec,
const Matrix3<Real>& mat)
{
return Vector3<Real>
(
vec[0]*mat[0][0] + vec[1]*mat[1][0] + vec[2]*mat[2][0],
vec[0]*mat[0][1] + vec[1]*mat[1][1] + vec[2]*mat[2][1],
vec[0]*mat[0][2] + vec[1]*mat[1][2] + vec[2]*mat[2][2]
);
}
//----------------------------------------------------------------------------
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