.. currentmodule:: discretize

.. _0.4.12_notes:

===================================
``discretize`` 0.4.12 Release Notes
===================================

June 6, 2020

This patch release is for a few small bugs and code speed improvements.

There is now a fast function for return active cell indexes for ``TensorMesh``-s,
``TreeMesh``-s, and symmetric ``CylMesh``-s below a topography surface defined by
scattered points, ``discretize.utils.active_from_xyz``.

There is also a bug fix of `#197 <https://github.com/simpeg/discretize/issues/197>`__
for the ``discretize.utils.refine_tree_xyz`` helper function on QuadTree meshes
when attempting to extend the padding vertically using ``method=surface``. There
was also a bug when reading in a 2D UBC mesh that would only manifest if the UBC
mesh's origin wasn't at the surface (`#194 <https://github.com/simpeg/discretize/issues/194>`__).

We have updated links as we are now using discourse over google groups as a means
for users to ask for general help. A few links to the SimPEG documentation needed to be updated for the re-organization of
the examples folders.

We are removing ``pymatsolver`` from the list of explicit dependancies for ``discretize``.
It is **highly** recommended, but it isn't actually required to run anything
within the ``discretize`` package.


Contributors
============

* @domfournier/@fourndo
* @jcapriot
* @lheagy
* @prisae

Bug Fixes
=========

* `#194 <https://github.com/simpeg/discretize/issues/194>`__: z-dimension in write/readUBC
* `#197 <https://github.com/simpeg/discretize/issues/197>`__: Amount of cells not changing when changing Octree levels in utils.refine_tree_xyz

Pull requests
=============

* `#193 <https://github.com/simpeg/discretize/pull/193>`__: Remove pymatsolver
* `#198 <https://github.com/simpeg/discretize/pull/198>`__: Refine tree xyz
* `#201 <https://github.com/simpeg/discretize/pull/201>`__: Update README.rst
* `#203 <https://github.com/simpeg/discretize/pull/203>`__: consolidating tests on travis
* `#205 <https://github.com/simpeg/discretize/pull/205>`__: Update requirements
* `#206 <https://github.com/simpeg/discretize/pull/206>`__: Bug fix for 2D mesh read in.
* `#207 <https://github.com/simpeg/discretize/pull/207>`__: update release notes