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Matrix4.cpp
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Matrix4.cpp
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#include "Matrix4.h"
#include "Quaternion.h"
#include <sstream>
namespace
{
/// \brief Returns \p euler angles converted from degrees to radians.
inline Vector3 euler_degrees_to_radians(const Vector3& euler)
{
return Vector3(
degrees_to_radians(euler.x()),
degrees_to_radians(euler.y()),
degrees_to_radians(euler.z())
);
}
inline bool quaternion_component_is_90(double component)
{
return (fabs(component) - c_half_sqrt2f) < 0.001f;
}
}
// Main explicit constructor (private)
Matrix4::Matrix4(double xx_, double xy_, double xz_, double xw_,
double yx_, double yy_, double yz_, double yw_,
double zx_, double zy_, double zz_, double zw_,
double tx_, double ty_, double tz_, double tw_)
{
xx() = xx_;
xy() = xy_;
xz() = xz_;
xw() = xw_;
yx() = yx_;
yy() = yy_;
yz() = yz_;
yw() = yw_;
zx() = zx_;
zy() = zy_;
zz() = zz_;
zw() = zw_;
tx() = tx_;
ty() = ty_;
tz() = tz_;
tw() = tw_;
}
// Named constructors
// Get a rotation from 2 vectors (named constructor)
Matrix4 Matrix4::getRotation(const Vector3& a, const Vector3& b)
{
double angle = a.angle(b);
Vector3 axis = b.crossProduct(a).getNormalised();
return getRotation(axis, angle);
}
Matrix4 Matrix4::getRotation(const Vector3& axis, const double angle)
{
// Pre-calculate the terms
double cosPhi = cos(angle);
double sinPhi = sin(angle);
double oneMinusCosPhi = static_cast<double>(1) - cos(angle);
double x = axis.x();
double y = axis.y();
double z = axis.z();
return Matrix4::byColumns(
cosPhi + oneMinusCosPhi*x*x, oneMinusCosPhi*x*y - sinPhi*z, oneMinusCosPhi*x*z + sinPhi*y, 0,
oneMinusCosPhi*y*x + sinPhi*z, cosPhi + oneMinusCosPhi*y*y, oneMinusCosPhi*y*z - sinPhi*x, 0,
oneMinusCosPhi*z*x - sinPhi*y, oneMinusCosPhi*z*y + sinPhi*x, cosPhi + oneMinusCosPhi*z*z, 0,
0, 0, 0, 1
);
}
Matrix4 Matrix4::getRotation(const Quaternion& quaternion)
{
const double x2 = quaternion[0] + quaternion[0];
const double y2 = quaternion[1] + quaternion[1];
const double z2 = quaternion[2] + quaternion[2];
const double xx = quaternion[0] * x2;
const double xy = quaternion[0] * y2;
const double xz = quaternion[0] * z2;
const double yy = quaternion[1] * y2;
const double yz = quaternion[1] * z2;
const double zz = quaternion[2] * z2;
const double wx = quaternion[3] * x2;
const double wy = quaternion[3] * y2;
const double wz = quaternion[3] * z2;
return Matrix4::byColumns(
1.0f - (yy + zz),
xy + wz,
xz - wy,
0,
xy - wz,
1.0f - (xx + zz),
yz + wx,
0,
xz + wy,
yz - wx,
1.0f - (xx + yy),
0,
0,
0,
0,
1
);
}
Matrix4 Matrix4::getRotationQuantised(const Quaternion& quaternion)
{
if (quaternion.y() == 0 && quaternion.z() == 0 && quaternion_component_is_90(quaternion.x()) && quaternion_component_is_90(quaternion.w()))
{
return Matrix4::getRotationAboutXForSinCos((quaternion.x() > 0) ? 1.0f : -1.0f, 0);
}
if (quaternion.x() == 0 && quaternion.z() == 0 && quaternion_component_is_90(quaternion.y()) && quaternion_component_is_90(quaternion.w()))
{
return Matrix4::getRotationAboutYForSinCos((quaternion.y() > 0) ? 1.0f : -1.0f, 0);
}
if (quaternion.x() == 0 && quaternion.y() == 0 && quaternion_component_is_90(quaternion.z()) && quaternion_component_is_90(quaternion.w()))
{
return Matrix4::getRotationAboutZForSinCos((quaternion.z() > 0) ? 1.0f : -1.0f, 0);
}
return getRotation(quaternion);
}
Matrix4 Matrix4::getRotationAboutXForSinCos(double s, double c)
{
return Matrix4::byColumns(
1, 0, 0, 0,
0, c, s, 0,
0,-s, c, 0,
0, 0, 0, 1
);
}
Matrix4 Matrix4::getRotationAboutYForSinCos(double s, double c)
{
return Matrix4::byColumns(
c, 0,-s, 0,
0, 1, 0, 0,
s, 0, c, 0,
0, 0, 0, 1
);
}
Matrix4 Matrix4::getRotationAboutZForSinCos(double s, double c)
{
return Matrix4::byColumns(
c, s, 0, 0,
-s, c, 0, 0,
0, 0, 1, 0,
0, 0, 0, 1
);
}
/*! \verbatim
clockwise rotation around X, Y, Z, facing along axis
1 0 0 cy 0 -sy cz sz 0
0 cx sx 0 1 0 -sz cz 0
0 -sx cx sy 0 cy 0 0 1
rows of Z by cols of Y
cy*cz -sy*cz+sz -sy*sz+cz
-sz*cy -sz*sy+cz
.. or something like that..
final rotation is Z * Y * X
cy*cz -sx*-sy*cz+cx*sz cx*-sy*sz+sx*cz
-cy*sz sx*sy*sz+cx*cz -cx*-sy*sz+sx*cz
sy -sx*cy cx*cy
transposed
cy.cz + 0.sz + sy.0 cy.-sz + 0 .cz + sy.0 cy.0 + 0 .0 + sy.1 |
sx.sy.cz + cx.sz + -sx.cy.0 sx.sy.-sz + cx.cz + -sx.cy.0 sx.sy.0 + cx.0 + -sx.cy.1 |
-cx.sy.cz + sx.sz + cx.cy.0 -cx.sy.-sz + sx.cz + cx.cy.0 -cx.sy.0 + 0 .0 + cx.cy.1 |
\endverbatim */
Matrix4 Matrix4::getRotationForEulerXYZ(const Vector3& euler)
{
double cx = cos(euler[0]);
double sx = sin(euler[0]);
double cy = cos(euler[1]);
double sy = sin(euler[1]);
double cz = cos(euler[2]);
double sz = sin(euler[2]);
return Matrix4::byColumns(
cy*cz,
cy*sz,
-sy,
0,
sx*sy*cz + cx*-sz,
sx*sy*sz + cx*cz,
sx*cy,
0,
cx*sy*cz + sx*sz,
cx*sy*sz + -sx*cz,
cx*cy,
0,
0,
0,
0,
1
);
}
Matrix4 Matrix4::getRotationForEulerXYZDegrees(const Vector3& euler)
{
return getRotationForEulerXYZ(euler_degrees_to_radians(euler));
}
// Get a scale matrix
Matrix4 Matrix4::getScale(const Vector3& scale)
{
return Matrix4::byColumns(
scale[0], 0, 0, 0,
0, scale[1], 0, 0,
0, 0, scale[2], 0,
0, 0, 0, 1
);
}
// Add a scale component
void Matrix4::scaleBy(const Vector3& scale)
{
multiplyBy(getScale(scale));
}