aframe-live-board

use THREE.WebGLRenderTarget to display in mesh.material such as

<a-entity live-board="target:#camera" id="board" material="shader:flat;" position="0 -8.47 -16.99" rotation="270 0 0" scale="1 1 1" visible="true" geometry="width:5;height:5;primitive:plane"></a-entity>		

detial

please look demo.html