artoolkit Distance between camera and ArMarker
<p>I want to find the accurate distance between camera and armarker. </p>

<pre><code>float[] markerDistance = ARToolKit.getInstance().queryMarkerTransformation(markerID.get(i));

float x = markerDistance[12];
float y = markerDistance[13];
float z = markerDistance[14];

double distance = Math.sqrt((x*x) + (y*y) + (z*z));
</code></pre>

<p>Here is the distance but it is not accurate.</p>

<p>My project depends on accurate or nearly accurate distance.</p>