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  1. Thanks, I'm able to do it now.
  2. Hi, is there a low level API to draw on top of what's already rendered like html canvas api? I don't want draw everything again on each frame when there is only little change. Say, we have already drew 100,000 lines a canvas. On next frame, we only need to draw another line of from position 0,0 to position 10,0. We don't want to clear the canvas and draw 100,001 lines again. In html canvas api, we can do something line beginPath + draw line + closePath, then beginPath + draw line + closePath, and then so on...