I've been trying to use custom markers... but it does not seem to work. Anyone else have this issue? I can get the hiro marker to work, as well as the barcode markers.
<a-marker-camera preset='custom' type='pattern' url='pattern-test-02.patt'>
<a-box position='0 0.5 -5' material='opacity: 0.5; side: double;color:red;'>
<a-torus-knot radius='0.26' radius-tubular='0.05'
animation="property: rotation; to:360 0 0; dur: 5000; easing: linear; loop: true">
</a-torus-knot>
</a-box>
</a-marker-camera>