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introduced euler angles

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matthias.ringwald 2010-06-13 22:25:21 +00:00
parent 7b5a7a7af9
commit f290dcf1ff
1 changed files with 38 additions and 1 deletions
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39
example/WiiMoteOpenGLDemo/rotation.c
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@ -172,6 +172,41 @@ void slerp(float v0[4], float v1[4], double t, float result[4]) {
}
void eulerFromQuaternion(float q[4], float euler[3]){
// heading, attitude, bank
float x2 = q[1]*q[1];
float y2 = q[2]*q[2];
float z2 = q[3]*q[3];
#if 0
euler[0] = atan2(2*(q[0]*q[1]-q[2]*q[3]),1-2*(x2+y2));
euler[1] = asin( 2*(q[0]*q[2]+q[1]*q[3]));
euler[2] = atan2(2*(q[0]*q[3]-q[1]*q[2]),1-2*(y2+z2));
if (euler[1] <= -M_PI || euler[1] >= M_PI){
euler[2] = 0;
euler[0] = atan2(q[1],q[0]);
}
#else
float unit = w2+x2+y2+z2; // if normalised is one, otherwise is correction factor
float test = q[1]*q[2] + q[3]*q[0];
if (test > 0.499*unit){ // singularity at north pole
euler[0] = 2 * atan2(q[1],q[0]);
euler[1] = M_PI/2;
euler[2] = 0;
} else if (test < -0.499*unit){ // singularity at south pole
euler[0] = -2 * atan2(q[1],q[0]);
euler[1] = -M_PI/2;
euler[2] = 0;
} else {
euler[0] = atan2(2*q[2]*q[0]-2*q[1]*q[3], w2+x2-y2-z2);
euler[1] = asin(2*test/unit);
euler[2] = atan2(2*qx*qw-2*qy*qz , w2-x2+y2-z2);
}
#endif
}
void getRotationMatrixFromVectors(float vin[3], float vout[3], float matrix[4][4]){
normalizeVector(vout,3);
@ -204,8 +239,10 @@ void getRotationMatrixFromVectors(float vin[3], float vout[3], float matrix[4][4
float angle = acos(vin[0]*vout[0]+vin[1]*vout[1]+vin[2]*vout[2]);
quaternionFromAxis(angle, axis, q);
#endif
normalizeVector(q,4);
float attitude = asin( 2*(q[0]*q[2]+q[1]*q[3]));
getRotationMatrixFromQuartenion(q,matrix);
}