This is thanks to a suggestion by Joachim Pouderoux

Change-Id: Ia1387b74715dd1be9fd1434ce429c4158782f20b

a467ad24 Now testing with multiple isocontours + material
61ebc622 Modified 2D + material test so the dual grid is shown explicitly
916a5afb Modified 2D test so the dual grid is shown explicitly
1645ad3d Eliminated int/vtkIdType VS7 warnings
43224dae Implemented support for dual and hyper tree grids with material
6d235305 New tests for material + dual
d12e9e9f Better testing in the context of material for HTG
d949fca0 A much better implementation of the HTG geometry filter

Change-Id: I765a613c22557a1a24af0187b2df7d44df0d82b0

Change-Id: I12bca1e795c502434efbcf4aeacea3345e51ddd5

Change-Id: I9d5862ec487c23ab31cb9c807ea90413f2da682f

10ff04a8 Add more environment variables to configure/debug matplotlib.

Change-Id: I927085db464523a94e94578af8a80215f5008a54

Change-Id: I096acec0cce988e7f8dc81f67513ce507920648c

Change-Id: I514041aceeae98a3cea1064512097167f4acd0bc

Change-Id: I1524102a7c1c8fb41f2ca45692ae1f54969a9ac3

Change-Id: I2b07533ea9d26adefe926213c951609994b4ae30

52587d2f Added new vector reader (internall uses GDAL)

5905ec68 Remove dead code in #ifdef VTK_USE_GL2PS/#endif blocks.

Change-Id: I12b98b28a990fc5a9d437778195263957262ee22

This class is aware of a number of enviroment variables that can be used to
configure and debug python initialization (all are optional):

- VTK_MATPLOTLIB_DEBUG: Enable verbose debugging output during initialization
  of the python environment.

- VTK_MATPLOTLIB_PYTHONINTERP: Path to the python interpreter. This will be
  passed to Py_SetProgramName prior to calling Py_Initialize.

- VTK_MATPLOTLIB_PYTHONHOME: See the Python documentation on the PYTHONHOME
  environment variable. This will be passed to Py_SetPythonHome prior to
  calling Py_Initialize.

- VTK_MATPLOTLIB_PYTHONPATH: A list of additional python module paths to be
  prepended to the sys.path object after initialization. Use ';' on windows and
  ':' on apple/linux to separate multiple paths.

Change-Id: I00613c3254750d26de350514a426fe24ce26f732

* pvvtk/pv-master:

Change-Id: Ic7007e857c9d8da771a91c86a8f9ffa359b9f81b

6b1a1f2c Merge topic 'add-crinkle-like-option-to-vtkThreshold' into master
052a9ef1 vtkThreshold: Add continuous range option
441a6725 Merge topic 'add_quadric_hyper_tree_grid_source' into master
0c5e87c6 Reimplemented GetMTime()
f2fc9b46 Do not modify time when parameters are unchanged
c56ab782 Better figure placement for testing
a1f9bab6 Max Level = 4 for regression testing
9b829643 Added material support to quadric definition. Testing it.
1dfeb271 Implemented complete genericity in terms of generating quadric
62811584 PERF: accelerate SubdivideFromQuadric()
c0be29e7 PERF: accelerated SubdivideFromDescriptor()
1381bd8d PERF: accelerated SubdivideFromDescriptor()
9b1cbb82 Fully implemented test case for HTG sphere
cca31b36 PERF: Accelerate a few things
a2c6b7dc Implemented the quadric-based subdivision for sphere. Added test.
22b858ec Added a UseDescriptor ivar and checking for it.
...

170704df Accelerate the bonds creation thanks to a vtkPointLocator.

7f1e48eb Remove \left{ and \right} from tests entirely.

The vtkPointLocator is used to find atoms in the acceptable
neighborhood for creating a bond.

We gain a 100x speedup on a molecule made with 50k atoms!

- oups copy/past error and the max dist test was missing. Fixed.

Change-Id: If6fa33fdfff3732f6c2875306a613b5aee81a805

These seem to be handled differently in different environments; some
fail to parse \left{ but work for \left\{, and vice-versa.

Change-Id: I0efc2a489297f083db0e84c62ac09eb6220f84d9

3a5adaad A regression test with apt colors, scalar bar, and other things
f9bb3619 Implemented a cleaner division scheme eliminating truncation errs

98a4d792 Fix TextContextMathImage.
cb04b0c2 Fix rotated mathtext rendering.
85aa8ff7 Fix failing TestRenderString test.
d70b7107 Add missing return statement.
6ea5a1a6 Exclude vtkTextRenderer from the tcl otherPrint test.

Change-Id: I9d609177175a6d4dfec22997d042990b508cf1cb

Change-Id: I6b7af313c2f41c0b5d0d2cb60e80f9e58e97fa1a

Matplotlib seems to need \left{ to be \left\{ in some cases?

Otherwise:

Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/matplotlib/textpath.py", line 137, in get_text_path
    glyph_info, glyph_map, rects = self.get_glyphs_mathtext(prop, s)
  File "/usr/lib/python2.7/site-packages/matplotlib/textpath.py", line 228, in get_glyphs_mathtext
    s, self.DPI, prop)
  File "/usr/lib/python2.7/site-packages/matplotlib/mathtext.py", line 3010, in parse
    box = self._parser.parse(s, font_output, fontsize, dpi)
  File "/usr/lib/python2.7/site-packages/matplotlib/mathtext.py", line 2344, in parse
    str(err)]))
ValueError:
\left{\frac{-b\pm\sqrt{b^2-4ac}}{2a}\right}
     ^
Expected a delimiter (at char 5), (line:1, col:6)
ERROR: In ../Rendering/Matplotlib/vtkMatplotlibMathTextUtilities.cxx, line 235
vtkMatplotlibMathTextUtilities (0x1cb8f70): Object is NULL!

Change-Id: I30d2e5eea46dafe670f1465c0b9afabea6b6c764

Fixes tests like this:
http://open.cdash.org/testDetails.php?test=170733152&build=2721044

Change-Id: I57d4c1cad88e2636941293c39a3852b7acddbf25

Don't scale the image to a power of two for this test, since we're
using vtkImageViewer2 instead of directly rendering a texture.

Change-Id: Ic72b68968f88b1694eee837850b9db551f9d39b2

Change-Id: I5a73762fedc450f683cd2f4426a26d4545abac2a

Like other wrapped singleton classes, this class doesn't seem
to clean up properly from tcl, and DebugLeaks causes the test to fail.

Change-Id: Iee4c82ccee953bfb26d2f4ec261e9d60b0934e63

c9242cc3 Whitespace cleanup
c516ed78 A complete test for material+ternary+quadric
282b1992 Removed unnecessary test variables
bad79e6f This sphere has a Material in it -- say it!
d21e0c1e Renamed Material test files for better understanding
813fb53a A new test that is binary+quadric+material+2D
d918e3c0 Added a new test, ternary+quadric+2D+material
fd021a8c Build 0-isocontour of quadric field. Also fixed formatting issues.
d5668777 Renamed test for consistency
12454553 Fixed license headers
c6553d3f Whitespace clean up
14b16b8b Squeeze() data arrays associated with the HTG generated by source
e822f5b2 Added color transfer function, scalar bar, fixed module.cmake
fc913f82 whitespace cleanup
f062a8aa Implemente correct 0-set computation up to max depth. Also a test.
d468b828 Implemented new array of quadric values when quadric mode used
...

Change-Id: I194cdca9e725421c8ef340d6e8cd9bfec0df00c5

Change-Id: Id0a5693cd9069d665b1719fca659bbe5ad22e10d

Change-Id: I6c333262ea67bf269500a3924bba7319c06f6168

Change-Id: I87af96e1e6fac3021e76fb3cec33652533a7068a

Change-Id: I4a3e5d583868ad6a2f26883fe7f3480ccc087969

Change-Id: I29a89f3e1eea519e26365758e94c951c43a5ff4b

Change-Id: Ib9cb15953a22519277e7af790f313226d7d96be7

Change-Id: I7aff2fa906aa6792453093bfb7148161535eb7c6

445d87f0 Fix compiler warning on vtkFreeTypeTools.cxx.