Properly deal with left hand coordinate systems in Eclipse

[cpgr]

To ensure a positive element Jacobian, the coordinate axis must be flipped (along with all properties).

[cpgr]

@Florian-Konrad - this branch produces the following

Can you check out this branch and double check that everything is ok?

[Florian-Konrad]

Awesome! Will have a look at it first thing in the morning (which is in roughly 12h for me :) ) Sent from [Proton Mail](https://proton.me/mail/home) for iOS Am Sonntag, 3. Dezember 2023 um 11:38, Chris Green ***@***.***(mailto:Am Sonntag, 3. Dezember 2023 um 11:38, Chris Green <<a href=)> schrieb:

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***@***.***(https://github.com/Florian-Konrad) - this branch produces the following [Screenshot.2023-12-03.at.9.35.57.pm.png (view on web)](https://github.com/cpgr/em2ex/assets/7664823/0edb7532-6f61-46e6-ad70-c5d6a4de234a) Can you check out this branch and double check that everything is ok? — Reply to this email directly, [view it on GitHub](#39 (comment)), or [unsubscribe](https://github.com/notifications/unsubscribe-auth/ARGNRLIMZ6PK4I4PODYZDW3YHRJDRAVCNFSM6AAAAABAEWAUBOVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMYTQMZXGQZTQOBZGQ). You are receiving this because you were mentioned.Message ID: ***@***.***>

[Florian-Konrad]

Short feedback, the boxmodel looks good but I'm seeing some errors still with a more complex model (seems to be distorted). I also discovered that these errors seem to arise from the default export options in Petrel. Need to check more and write you a summary if I have gathered the relevant info from testing.

[Florian-Konrad]

Just to get back to you quickly. With a real model which has a rotated grid (not aligned with x,y,z axes) I get a distorted output mesh (see screenshot). I didnt find the time yet to make an example model to share with u and reproduce this problem. U probably need one to solve this right?

[cpgr]

Oh dear, that looks really wrong! If I am reading this correctly, there is a MAPAXES keyword in the .grdecl file? There must be something with the order of the transformation and then translation. I'll see if I can make a simple example to replicate this.