/usr/include/assimp/quaternion.h is in libassimp-dev 4.1.0~dfsg-3.
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Open Asset Import Library (assimp)
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*/
/** @file quaternion.h
* @brief Quaternion structure, including operators when compiling in C++
*/
#pragma once
#ifndef AI_QUATERNION_H_INC
#define AI_QUATERNION_H_INC
#ifdef __cplusplus
#include "defs.h"
template <typename TReal> class aiVector3t;
template <typename TReal> class aiMatrix3x3t;
// ---------------------------------------------------------------------------
/** Represents a quaternion in a 4D vector. */
template <typename TReal>
class aiQuaterniont
{
public:
aiQuaterniont() : w(1.0), x(), y(), z() {}
aiQuaterniont(TReal pw, TReal px, TReal py, TReal pz)
: w(pw), x(px), y(py), z(pz) {}
/** Construct from rotation matrix. Result is undefined if the matrix is not orthonormal. */
explicit aiQuaterniont( const aiMatrix3x3t<TReal>& pRotMatrix);
/** Construct from euler angles */
aiQuaterniont( TReal rotx, TReal roty, TReal rotz);
/** Construct from an axis-angle pair */
aiQuaterniont( aiVector3t<TReal> axis, TReal angle);
/** Construct from a normalized quaternion stored in a vec3 */
explicit aiQuaterniont( aiVector3t<TReal> normalized);
/** Returns a matrix representation of the quaternion */
aiMatrix3x3t<TReal> GetMatrix() const;
public:
bool operator== (const aiQuaterniont& o) const;
bool operator!= (const aiQuaterniont& o) const;
bool Equal(const aiQuaterniont& o, TReal epsilon = 1e-6) const;
public:
/** Normalize the quaternion */
aiQuaterniont& Normalize();
/** Compute quaternion conjugate */
aiQuaterniont& Conjugate ();
/** Rotate a point by this quaternion */
aiVector3t<TReal> Rotate (const aiVector3t<TReal>& in);
/** Multiply two quaternions */
aiQuaterniont operator* (const aiQuaterniont& two) const;
public:
/** Performs a spherical interpolation between two quaternions and writes the result into the third.
* @param pOut Target object to received the interpolated rotation.
* @param pStart Start rotation of the interpolation at factor == 0.
* @param pEnd End rotation, factor == 1.
* @param pFactor Interpolation factor between 0 and 1. Values outside of this range yield undefined results.
*/
static void Interpolate( aiQuaterniont& pOut, const aiQuaterniont& pStart,
const aiQuaterniont& pEnd, TReal pFactor);
public:
//! w,x,y,z components of the quaternion
TReal w, x, y, z;
} ;
typedef aiQuaterniont<ai_real> aiQuaternion;
#else
struct aiQuaternion {
ai_real w, x, y, z;
};
#endif
#endif // AI_QUATERNION_H_INC
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