Wrong wing cell generation of the lower shell

[hardt-fa-flb]

The creation of the wing cells of the lower shell is wrong. In this CPACS-file there are several wing cells defined along the chord, but the trailing boundary of all TIGL generated cell shapes is the trailing edge:

[joergbrech]

Thanks for opening an issue! I can reproduce your problem. As expected, the problem is in the logic of converting the internal parametrization of the faces of the wing to contour coordinates:

The internal parameters in chordwise direction start at the lower part of the trailing edge and end at the upper part of the trailing edge. Contour coordinates always start at the leading edge and end at the trailing edge. Therefore, on the lower skin, the contour coordinate parametrization has a different sign than the internal parametrization. This and the fact, that the wing could potentially already be a patchwork of many faces, that do not coincide with the cell faces makes the internal trimming logic a bit complicated and error prone.

That begin said, I think I found the conversion error and can generate the blade fine now: