[Paraview] Blurred volume rendering

[Aashish Chaudhary]

Thomas,

I am looking at your data in VTK. I will report back. In ParaView, you
cannot choose linear or nearest as of now. We have a plan to expose all of
the volume property parameters in ParaView (hopefully soon).

Thanks,


On Mon, Nov 30, 2015 at 3:06 PM, Thomas Oliveira <thomas.oliveira at gmail.com>
wrote:

> 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>*
>>
>
>


-- 



*| 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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