Renko chart Issue

Hello Team,
Am one of Zerodha user. Happy to see the Renko chart in Nest. But not sure the exact brick size for the scripts ( RELIANCE, Yesbank ). Just tried different ways by apply ATR (14)method. By badluck the high & low values for the intraday is not accurate. Could you please let me know how to calculate the brick size ?

Hi, still using nest? PI is good. Try it.

Is values accurate in PI ??

Give one example plz