Altimeter & QNH on BMS

[fox_hunter73]

Hello to All, i've build my 3D altimeter but i've many prb to set the right altitude because there aren't the value in Shared Memory.
I've find "Z word", "QNH", "CABIN ALTITUDE" and i'm working on them value but without success.
The Z word is a coordinate , i suppose on yhe level sea , is right?
And qnh is the compensation, but it's refer to the airport level....
but i haven't find the right formula to correlate them and have the same altitude on the instrument,
can someone help me?

[mihi4]

flightData2->AAUZ * -1 is the height in feet

flightData2->AltCalReading is the settings for the QNH

[fox_hunter73]

THHHAAANKKS so MUCH !!!!!