CODEWITHSUNDEEP
androidaugmented-reality
userX
userX

Reputation: 59

augmented reality orientation

hello i want to ask which sensor is the best to find your current orientation? the orientation sensor or the combination of and (compass). I have seen a lot of augmented reality versions and i wonder which one is the best! Some of these use the to find the azimuth whereas other use the accelerometer and magnometer. As i know orientation sensor is deprecated.

Upvotes: 0

Views: 540

Answers (2)

Balu SKT
Balu SKT

Reputation: 549

You can use gyroscope sensor to find the rotation vector. It can be used to get the azimuth.

SensorManager mSensorManager = (SensorManager)
getSystemService(Context.SENSOR_SERVICE);
rSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_ROTATION_VECTOR);

And in onSensorChanged function,

SensorManager.getRotationMatrixFromVector(mRotationMatrix, event.values);
SensorManager.getOrientation(mRotationMatrix, mValues);

azimuth = Math.toDegrees(mValues[0]));

But in some devices this sensor may not be available. In that case you can use combination of Accelerometer and Magnetometer.

mSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD);
aSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);

In onSensorChaged function,

switch (event.sensor.getType()) {
    case Sensor.TYPE_MAGNETIC_FIELD:
        magnetic = event.values.clone();
        break;
    case Sensor.TYPE_ACCELEROMETER:
        accelerometer = event.values.clone();
        break;
}

if (magnetic != null && accelerometer != null) {
    Rot = new float[9];
    I = new float[9];
    SensorManager.getRotationMatrix(Rot, I, accelerometer, magnetic);

    float[] outR = new float[9];
    SensorManager.remapCoordinateSystem(Rot, SensorManager.AXIS_X,
            SensorManager.AXIS_Z, outR);
    SensorManager.getOrientation(outR, values);

    azimuth = values[0];
    magnetic = null;
    accelerometer = null;
}

Gyroscope provides the best result out of the two options.

Upvotes: 2

v0d1ch
v0d1ch

Reputation: 2748

I found that if you need framework that is free MIXARE is really great

Upvotes: 2

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