Hi. I’m trying to understand how the `MappedIntegrationPoint`

works.

Say I have a mesh `Omega`

and I call `ip = Omega(x,y)`

.

I understand that the returned object `ip`

contains information on the element containing the point (x,y) ( `ip.nr`

) as well as the coordinates of of (x,y) when transformed to the reference element.

Which is this reference element? for the triangle is it?

(0,0) (1,0) (0,1) ??

Is this documented anywhere?

Concerning the coordinates in the reference domain, I assume they are stored in `ip.pnt`

. How are those coordinates defined?

If they are defined as baricentric coordinates, I understand that:

```
a, b, c = ip.pnt
a*P + b*Q + c*R
```

should return the original point (x,y), right?

( `P`

, `Q`

and `R`

are `np.array`

containing the coordinates of the original triangle)

I’ve tried this, bu I dont always get the expected results.

What am I missing? (is there any place in the documentation where I can read about it? )

Thank you very much