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* release: (25 commits)
  Fixed volume rendering not working for cell data
  Fixed typo which resulted in test failure
  Added API to turn on/off jittering
  Fixed edge conditions with clipping
  ...

Primarily brings in volume rendering fixes.

This reverts commit 2c3f90a2.

This fixes BUG #15993. Discarding fragments with 0 alpha ended up
discarding pixels even when blending was disabled. That was causing the
bug reported in 159993. BUG #15874 has since been fixed by
paraview/paraview!598, this fix is no longer needed for the issue it was
added to fix (albeit incorrectly).

(cherry picked from commit e0a8c7da)

* origin/release:
  VTKWeb update to allow server side notification to client
  Fix mouse wheel zooming in PyQt interactor
  zlib 2016-01-20 (bfc811e0)
  Merge branch 'upstream-zlib' into update-zlib
  Fix errors related to missing PyInt_AsLong and PyString_AsString on Python 3
  Bug 15934: vtkMetaImageWriter incorrect voxel spacing and origin
  ios: fix newline-at-end-of-file
  update for newer versions of iOS
  fix a cmake warning for users of VTK
  Fix CMake error if in directory with ++ in name.
  Change deprecation warning to "VTK 7.0".

* gl/sebastien.jourdain/fix-pvw-protocols:
  VTKWeb update to allow server side notification to client

Merge-request: !1212

6b1d302f Fix mouse wheel zooming in PyQt interactor
Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !1186

* Use angleDelta() if delta() does not exist (PyQt5)
* Only zoom if cumulative delta is greater/less than +/- 15 degrees

The issue was related to the fact that we were computing wrong
extents.

(cherry picked from commit 7aed3d51cc4337eca87b9661d1506507792f6458)

(cherry picked from commit 1965a491ba7031f5f7e9b368625b023cf9d65ecd)

(cherry picked from commit e509a788275dbf99324d721b0998f6a8e61a91e9)

(cherry picked from commit 474c1580838b8ee1a65d886cd291bc696ac65521)

(cherry picked from commit 191d60593ebfa9613e9679bc5fcce77c9f04d970)

(cherry picked from commit 3caa299d75baabcf1b4e686d470ccfb838b1df86)

(cherry picked from commit d56e7c48914f6dd8b644c2a27ca2b0cb8ed24209)

(cherry picked from commit cc51aa3a10c671e1203c33ffc00bd80653df55d4)

(cherry picked from commit 805764ab8b24e1fb59a89b8870a281b322997353)

(cherry picked from commit 3be3c369d6de0eeee5b0948258949bd1e4492416)

(cherry picked from commit e47af64517a6df7cfc4c3b14ca83c794a87f6834)

(cherry picked from commit 1120c7b42b9f9df8e48ad7e7b7004910bd95ebe4)

Also, optimized the code a bit so it should be faster now.

(cherry picked from commit 2cc3f81fbac205bdf5ec7b00524a8dc272962f32)

(cherry picked from commit 2b28d547b01432e1914b229fafd9458fee497556)

(cherry picked from commit 34cb4015c3b53277e8e038882e7c9a73b53b84ec)

(cherry picked from commit cb8a6d338800588280f006def98d5c080fc0eacf)

(cherry picked from commit f784808308af7758d54714c35a3b8d37a3828dd5)

Mostly the issue was that variables are not set correctly when
gradient opacity was turned on. Most of these variables state
were dependent on whether or not shading was ON.

(cherry picked from commit b1d482d803d2a65d5c28239a6f0c9a34a4ad1c7c)

(cherry picked from commit e8766bef6213492630af0d095d8376fcf1e45f2b)

(cherry picked from commit e9cc988b7984b0a6e18d430c416b010f936971f0)

After reading the spec carefully realized that
we don't need to treat texture type as basis
for texture dimension. Also added note clarification
on what does size means.

(cherry picked from commit c2193e006dbf37645c39a1ec3b43402f18f34626)

(cherry picked from commit bda1f3248881dcc11d106f8e6f1f16903ca5861d)

(cherry picked from commit 985eb6b1ae77b8a32bc3b1cf98ae5887050fd284)

(cherry picked from commit b98cbbf7829a0e2a91894a9226c31b933c56bdf1)

(cherry picked from commit f0998aea2cab20eabe1bc1c07ff3c7dcd164aa80)

Merge remote-tracking branches 'gl/dgobbi/15934-meta-writer-update' and 'gl/dgobbi/zlib-mangle-z_errmsg' into release

* gl/dgobbi/15934-meta-writer-update:
  Bug 15934: vtkMetaImageWriter incorrect voxel spacing and origin

* gl/dgobbi/zlib-mangle-z_errmsg:
  zlib 2016-01-20 (bfc811e0)
  Merge branch 'upstream-zlib' into update-zlib

* upstream-zlib:
  zlib 2016-01-20 (bfc811e0)

Code extracted from:

    https://gitlab.kitware.com/third-party/zlib.git

at commit bfc811e0f5fe40c8f9e22ca98b8623c93d89b3e8 (for/vtk).

* upstream-zlib:
  zlib 2016-01-08 (5a2db714)

b80ecbf0 Fix errors related to missing PyInt_AsLong and PyString_AsString on Python 3
Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !1082

use _PyUnicode_AsString for Python 3.0-3.2

The vtkMetaImageWriter's Write() method was getting the spacing and origin
from the input's data object before updating the data object.  As a result,
an incorrect spacing and origin was written to the file header.