[Paraview] Blurred volume rendering

[Thomas Oliveira]

Dear Aashish,

Can I choose the interpolation (linear vs nearest) or is it hard-coded on
the call of VTK from Paraview?

A dataset can be downloaded from
http://www3.imperial.ac.uk/pls/portallive/docs/1/33505696.ZIP .
Please extract the Berea.raw file from the zip.
I loaded it using:
"""
Raw (binary) Files
Data Scalar Type: unsigned char
Data Byte Order: Little Endian
Data Extent: 0-399, 0-399, 0-399
"""

Thank you for your attention,

Thomas Oliveira


On Mon, Nov 30, 2015 at 4:31 PM, Aashish Chaudhary <
aashish.chaudhary at kitware.com> wrote:

> Thomas,
>
>
>
> On Mon, Nov 30, 2015 at 10:34 AM, Thomas Oliveira <
> thomas.oliveira at gmail.com> wrote:
>
>> Dear Aashish,
>>
>>
>> I'm using Paraview 4.4.0 64-bit , OpenGL Version 4.5.0 NVIDIA 352.55,
>> OpenGL Renderer Quadro K600/PCIe/SSE2.
>>
>> Tweaking the transfer function improved the result, but the corners are
>> rendererd rounded, whereas in the original file I have only cubic voxels.
>>
>
> I am wondering if that would be because of the interpolation (linear vs
> nearest) since linear will smooth out the edges just a bit. Is there a
> sample dataset you can send my way?
>
>
>> I though that unsetting "Properties > Scalar Coloring > Interpolate
>> Scalars Before Mapping" would improve the image, but I saw no change.
>>
>> You suggested to enable shading, but I couldn't find it. Where is it?
>>
>
> Its on the same panel (left side), scroll to the bottom or search for
> "shade" you should be see it.
>
> - aashish
>
>>
>>
>> Thank you for your help,
>>
>> Thomas Oliveira
>>
>>
>> On Mon, Nov 30, 2015 at 3:07 PM, Aashish Chaudhary <
>> aashish.chaudhary at kitware.com> wrote:
>>
>>> Hi Thomas,
>>>
>>> On Mon, Nov 30, 2015 at 8:54 AM, Thomas Oliveira <
>>> thomas.oliveira at gmail.com> wrote:
>>>
>>>> Hi,
>>>>
>>>> The Sample.png file attached is an image of a pore medium. Each voxel
>>>> in the image is a cube that is either solid or void.
>>>>
>>>> The Zoom.png file attached is a zoom of it, where it can be seen that
>>>> the curved interior solid walls are approximated by a staircase
>>>> discretization.
>>>>
>>>> How can I render this staircase geometry more clearly?
>>>>
>>>
>>> Did you try to tweak the transfer function? Also, you can enable shading
>>> to have a look of a solid surface.
>>>
>>>
>>>> I have tried tweaking many properties on ParaView but I still get it
>>>> blurred.
>>>>
>>>
>>> Just to be sure, what version of ParaView you are using and what OpenGL
>>> backend?
>>>
>>>>
>>>> Thank you for your help,
>>>>
>>>> Thomas Oliveira
>>>>
>>>>
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>>>
>>>
>>> --
>>>
>>>
>>>
>>> *| Aashish Chaudhary | Technical Leader         | Kitware Inc.
>>>   *
>>> *| http://www.kitware.com/company/team/chaudhary.html
>>> <http://www.kitware.com/company/team/chaudhary.html>*
>>>
>>
>>
>
>
> --
>
>
>
> *| Aashish Chaudhary | Technical Leader         | Kitware Inc.            *
> *| http://www.kitware.com/company/team/chaudhary.html
> <http://www.kitware.com/company/team/chaudhary.html>*
>
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