# Snip calculate field value at point

From OpenFOAMWiki

The original question (as posten on the Message board) was: *Given a position as (x,y,z), I want the u or p value in this point by using interpolation.*

## 1 Doing the interpolation by yourself

vector probePoint(x,y,z); label probeCell = mesh.findCell(probePoint); const labelList&amp;amp;amp;amp;amp;amp; probeCellNeighbours = mesh.cellCells()[probeCell]; forAll(probeCellNeighbours, cellI) { // Do your stuff }

## 2 Using OpenFOAM's interpolation classes

TODO