The vPOC or volume point of control shows where most of the volume was traded. This is important because this is where the institutions and market makers have opened their positions, and these are the ones that move the markets!
This indicator is designed to cut through the volume noise, and enable the hiding of lower volume data. The main setting allows you to define a lookback, and obscure the candles whose volume is less than x % of the highest volume in this lookback.
Of the remaining candles, their vPOC will be displayed. There are extra settings to extend naked vPOCs, as well as the highs and lows of these high volume candles, plus an EMA based on the vPOC price levels.
I must credit quantifytools quantifytools who allowed me to utilize his code, for finding vPOCs using lower timeframe candles - there are comments in the code also. It works perfectly so why reinvent the wheel?