Sorry, I accidentally sent this direct instead of to the list. Copied below to save anyone else having to send replies. This solved the issue. On 15/08/2023 20:14, Tarquin Wilton-Jones wrote:

Hi Torsten,

...

Does anyone have a hint what's going on and what is wrong?

I would export a .3d file. That way there is no morphing involved, only the centreline. Measure the depth with Survex Aven. If it is right, good, then this is not a data issue.

Then enable centreline in the layout, so you can see whether the centreline and the cave walls agree with each other. I suspect you will see the error here; maybe you have selected the wrong station number in a scrap when creating a "point station" with "-name foo". This tends to create the biggest warps.

In the layout: debug all

That will show you which parts of a scrap have the most distortion. Your error is somewhere around that.

Hopefully one of those helps. If not ... share the code if you can, and I will try to debug it?

Cheers,

Tarquin