Hi!
I've been trying to map the accelerometer values to earth coordinates
using the rotation matrix.
I would expected to have in the Z axis the Gravity value always, but
the remapped coordinates when I move the phone shows the Gravity value
in the X and in the Y coordinate also.
Does anyone has an example of this kind of mapping?
I have been trying with this code:
You have in accels and mags the values of the accelerations and
magnetic field.
final int matrix_size = 16;
float [ ] R2 = new float [ matrix_size ];
float [ ] outR = new float [ matrix_size ];
float [ ] I = new float [ matrix_size ];
float [ ] I2 = new float [ 4 ];
SensorManager.getRotationMatrix ( R2, I, accels, mags );
// SensorManager.remapCoordinateSystem ( R2, SensorManager.AXIS_X,
// SensorManager.AXIS_Z, outR );
// outR = R2;
// SensorManager.getOrientation ( outR, I2 );
// Log.d (TAG, "inclineation values: " + I2 [ 0 ] + " " + I2 [ 1 ]
+
" " + I2 [ 2 ]);
float [ ] v = new float [ 4 ];
float [ ] v2 = new float [ 4 ];
v2 [ 0 ] = accels [ 0 ];
v2 [ 1 ] = accels [ 1 ];
v2 [ 2 ] = accels [ 2 ];
v2 [ 3 ] = 0.0f;
Matrix.multiplyMV ( v, 0, outR, 0, v2, 0 );
Log.d (TAG, "Rotated values: " + v[0] + " " + v[1 ] + " " + v
[2]);
Any ideas of what am I doing wrong?
Thank you in advance.
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