Point & Cell data

Hello MayaVi friends,

My question concerns .VTK files and MayaVi.

I want my .VTK file to containt:

POINT data
  Scalars
    xxxxx
  Vectors
    xxxxx
  Tensors
    xxxxx

CELL data
  Scalars

Is it possible to:
  (a) Have more than 2 types (scalars/vectors) under POINT data?
  (b) Have POINT and CELL data in the same file?

Thanks,

DQ

--
Dimitrios E. Kiousis

PhD Student
School of Engineering Sciences

Re: Point & Cell data

>>>>> "Dimitrios" == Dimitrios E Kiousis <dk <at> hallf.kth.se> writes:

    Dimitrios> POINT data Scalars xxxxx Vectors xxxxx Tensors xxxxx

    Dimitrios> CELL data Scalars

    Dimitrios> Is it possible to: (a) Have more than 2 types
    Dimitrios> (scalars/vectors) under POINT data?  (b) Have POINT and
    Dimitrios> CELL data in the same file?

Yes, you can do both (a) and (b).

cheers,
prabhu

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vtk header & data type

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Re: vtk header & data type

>>>>> "Michael" == Michael Franklin <mbfranklin <at> gmail.com> writes:

    Michael> Hello All, I am writing Python scripts which read-in byte
    Michael> data, with the purpose of visualizing using the Volume
    Michael> module.  Problem is, whenever I create the .vtk files, I
    Michael> end up with the following header:
[...]
    Michael> Now the Volume module only works for data type
    Michael> "unsigned_char" or "unsigned_short".  Is there a way to
    Michael> set the line "SCALARS Data_array int 1" to read "SCALARS
    Michael> Data_array unsigned_char" within my script so I don't
    Michael> have to manually change the .vtk file or use the
    Michael> StructuredPointProbe?  Any help would be appreciated.

Given what you have written I assume that you are using pyvtk to
generate the files?  If that is the case, use a Numeric data array of
typecode 'b' or 'w' to get unsigned_char/unsigned_short in your
output.  I figured this out by reading the pyvtk sources.  Look in
pyvtk/common.py.

cheers,
prabhu

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Effective stress?

Hello MayaVi users,

I am exporting stresses from my FE computation and I use
POINTDATA
TENSOR stre float
s(11)  s(12)  s(13)
s(12)  s(22)  s(23)
s(13)  s(23)  s(33)

in my MayaVi file.

When I try to plot my results and use the filter ExtractTensorComp I get an
addition option "Effective Stress".

What is this exactly?

Thanks,

Dimitris

--
Dimitrios E. Kiousis

PhD Student
School of Engineering Sciences
KTH - Royal Institute of Technology

Tel.: +46 733 684025
E-post: dk <at> hallf.kth.se
Web: www.dqdev.net

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Re: Effective stress?

On Thursday 06 July 2006 13:42, Dimitrios E. Kiousis wrote:
....
>
> When I try to plot my results and use the filter ExtractTensorComp I get an
> addition option "Effective Stress".
>
> What is this exactly?
>

Accordig to the source (VTK/Graphics/vtkExtractTensorComponents.cxx)

     if ( this->ScalarMode == VTK_EXTRACT_EFFECTIVE_STRESS )
        {
        sx = tensor[0];
        sy = tensor[4];
        sz = tensor[8];
        txy = tensor[3];
        tyz = tensor[7];
        txz = tensor[6];

        s = sqrt (0.16666667 * ((sx-sy)*(sx-sy) + (sy-sz)*(sy-sz) +
                                (sz-sx)*(sz-sx) +
                                6.0*(txy*txy + tyz*tyz + txz*txz)));
        }

I think that this should correspond to the Von Mises effective stress. 
Does it?

Regards

ZP

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citation

Hi,
   Is there a publication to cite for referring to mayavi?

Regards,
Les

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Re: citation

>>>>> "Les" == Les Clowney <clowney.lester <at> aist.go.jp> writes:

    Les> Hi, Is there a publication to cite for referring to mayavi?

 http://mayavi.sourceforge.net/docs.html#articles 

has references you can use for mayavi1.  For MayaVi2 you can look at
the paper mentioned here: 

 https://svn.enthought.com/enthought/wiki/MayaVi

cheers,
prabhu

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Faulty installation / bug?

Hello,
      I installed the binary for VTK 5.0.1, but there were no Python
bindings.  So I uninstalled and tried to install from the source, but no
luck.  Eventually I just unzipped the files from
VTK-6.4.2-Python-2.4.1.zip (not a typo, this is the name of the file,
though I guess it should be 4.4.2) and got an apparently working
installation.  (I also installed ActiveTCL prior to this.)

I unzipped MayaVi-2.5.zip (not a typo) to my C drive and ran setup.py
install; everything seemed OK.

All the tests in test_vtk.py seem to pass.

But if I try the following (more or less copied directly from the
documentation) I have a problem.

>>> import Tkinter
>>> r = Tkinter.Tk()
>>> r.withdraw()
''
>>> import mayavi
>>> v = mayavi.Main.MayaViTkGUI(r)
>>> v.load_visualization('c:\MayaVi-1.5\examples\heart.mv')

The window hangs until I restart the shell.

A little editing allows me to get a traceback,

Traceback (most recent call last):
  File "<pyshell#5>", line 1, in -toplevel-
    v.load_visualization('c:\MayaVi-1.5\examples\heart.mv')
  File "C:\Python24\lib\site-packages\mayavi\Main.py", line 1847, in
load_visualization
    self.mayavi.load_visualization (file_name)
  File "C:\Python24\lib\site-packages\mayavi\Main.py", line 844, in
load_visualization
    exception ()
  File "C:\Python24\lib\site-packages\mayavi\Main.py", line 832, in
load_visualization
    dvm.load_config (file)
  File "C:\Python24\Lib\site-packages\mayavi\Base\DataVizManager.py",
line 164, in load_config
    self.mod_mgr[self.cur_mm_name].load_config (file)
  File "C:\Python24\Lib\site-packages\mayavi\Base\ModuleManager.py",
line 370, in load_config
    self.scalar_lut_h.load_config (file)
  File "C:\Python24\lib\site-packages\mayavi\Misc\LutHandler.py", line
255, in load_config
    lut_v, r_on, v_r_on, v_d_r = eval (val)
  File "<string>", line 0, in -toplevel-
NameError: name 't' is not defined

although the line numbers will be a little out due to a few print
statements that I added.

It seems that 'val' is a string (the end of the line in heart.mv
containing 'custom16.lut\n').  Any clue whether this is a problem with
my installation, or something else?  BTW, executing MayaVi.pyw from
C:\Python\Scripts does not open a window, and C:\MayaVi-1.5\mayavi has
not been renamed (which I expected after glancing at setup.py).  Any
help much appreciated.

Duncan Smith

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Re: Faulty installation / bug?

>>>>> "Duncan" == Duncan Smith <buzzard <at> urubu.freeserve.co.uk> writes:

    Duncan> Hello, I installed the binary for VTK 5.0.1, but there
    Duncan> were no Python bindings.  So I uninstalled and tried to
    Duncan> install from the source, but no luck.  Eventually I just
    Duncan> unzipped the files from VTK-6.4.2-Python-2.4.1.zip (not a
    Duncan> typo, this is the name of the file, though I guess it
    Duncan> should be 4.4.2) and got an apparently working
    Duncan> installation.  (I also installed ActiveTCL prior to this.)

Easiest way to get it installed is to install the latest Enthought
Python edition:

        http://code.enthought.com

    Duncan> I unzipped MayaVi-2.5.zip (not a typo) to my C drive and
    Duncan> ran setup.py install; everything seemed OK.

Well, I don't understand the typos because there isn't a
VTK-6.4.2*.zip that I know of nor is there a MayaVi-2.5.zip.  OTOH if
you do have one of those handy time machines I'd like a copy of the
2.5 release. 

    >>>> v.load_visualization('c:\MayaVi-1.5\examples\heart.mv')

    Duncan> The window hangs until I restart the shell.

    Duncan> "C:\Python24\lib\site-packages\mayavi\Misc\LutHandler.py",
    Duncan> line 255, in load_config lut_v, r_on, v_r_on, v_d_r = eval
    Duncan> (val) File "<string>", line 0, in -toplevel- NameError:
    Duncan> name 't' is not defined

    Duncan> although the line numbers will be a little out due to a
    Duncan> few print statements that I added.
    Duncan> It seems that 'val' is a string (the end of the line in
    Duncan> heart.mv containing 'custom16.lut\n').  Any clue whether
    Duncan> this is a problem with my installation, or something else?

Does the heart.mv file have unix line endings?  If so you will need to
convert it to a Windows line ending.  I used to use the lfcr.py script
that is usually part of a Python install.  It used to be available in
the Enthought Python edition in Tools/Scripts.

    Duncan> BTW, executing MayaVi.pyw from C:\Python\Scripts does not

I am not sure why this is the case.  Are there any error messages?

    Duncan> open a window, and C:\MayaVi-1.5\mayavi has not been
    Duncan> renamed (which I expected after glancing at setup.py).
    Duncan> Any help much appreciated.

C:\MayaVi-1.5\mayavi will not be renamed the installed MayaVi.pyw *is*
the renamed mayavi.

cheers,
prabhu

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