- For 3D stress and shear on plane, fix some inconsistencies for the sign of the shear stress. - Optimise the calculation of slip tendency and dilation tendency by taking advantage of the symmetry of the problem. - Fix update of output table for the first six 3D strain operations (last two columns weren't showing properly). - Optimise the code significantly and make it more robust as well as easier to maintain.

Further improvements to slip or dilation tendency display in stereonet and Mohr Circle.

View -> Dilation Tendency menu computes dilation tendency.

Correct the calculations involving the pitch of a line. Now the pitch of a line can have a magnitude (absolute value) between 0 and 180 degrees. Also, if no sense is entered, the pitch of the line is measured with respect to the strike of the plane (following the right-hand-rule convention). The calculation for pitch is now more robust and is based on the rotation of the strike line about the pole to the plane, and amount equal to the pitch. Thanks to Andrew Duncan for pointing out this bug.

. Replace lots of deprecated code. . Minimum deployment target is macOS 10.13 . Compiled in Xcode 15.3

Minor changes to the documentation Minor bug fixes and removal of deprecated methods Compiled in Xcode 12.3

Fix the sign of the shear traction in the 3D stress computation. This also corrects the Mohr Circle for 3D stress.

Improve initial location of windows and panels

. Fix a bug when dragging and dropping images from the Stereonet or the Mohr circle . Replace several deprecated methods . Compiled in Xcode 11.4

. Fix labels of Stereonet panel in Dark Mode

Built in Xcode 10.2 Improve behaviour of Stereonet and Mohr Circle panels Minor bug fixes

. Built in Xcode 10.1 . Apple notarized . Improved documentation

. Fixed minor bugs . Built in Xcode 9.0

This is an important update: . New Drillholes view with four operations for oriented drillcore. . Fix several bugs in Input and Results tables

. Add copy and paste from/to tables . Update copyright to 2017

Change App name to GeoKalk. Previous name collided with another App

Fix minor bugs and interface glitches

. Failure envelope for the Mohr circle for stress

- Further optimisations - Remove one redundant operation in the Planes and Lines view - updated documentation

In 3D stress, a new View -> Slip Tendency menu colours Stereonet and Mohr circle by slip tendency (see third screenshot)

Remove Drillholes section

New, much better interface: Document based calculator, table based input and results, display of active and selected operations in stereonet and Mohr circle. Read from and write to text files. The program was rewritten from scratch using the latest Cocoa technologies. The number of code lines is about one fifth of the previous version.