[Paraview] to be sure about used hardware ...

[Armin Wehrfritz]

On 05/12/2015 09:58 PM, u.utku.turuncoglu at be.itu.edu.tr wrote:
> Okay. That makes sense because i have a Threshold filter in my
> visualisation pipeline. If i use wavelet source then i could see the
> "Volume Rendering Mode" and it is set as "Smart". So, using Threshold
> filter might also reduce the performance of the volume rendering. Right?
Yes, the performance is severely impaired when you apply the threshold 
filer to a structured dataset, since it produces an unstructured dataset.
To my understand you don't get a true volume rendering for unstructured 
dataset, but maybe somebody who knows more about the details can comment 
on this.

However, since you have already a structured dataset to begin with, you 
should be able to get a decent performance. As I said, I can render a 
64M structured dataset (i.e. a 400x400x400 wavelet source) instantly on 
my laptop. So your 8M dataset should be no problem, just don't use the 
threshold filter.

If you want to work only on a subset of your dataset, you can use the 
"Extract Subset" filter, which outputs a structured dataset again.
Otherwise you can achieve similar effects as with the threshold filter 
by adjusting the transfer function/color scale for the volume rendering.

-Armin





>> Can you post the output of the following commands:
>> 1) paraview --version
>> 2) glxinfo | grep OpenGL
>>
>> Concerning different dataset types and volume rendering:
>> Are you sure that your dataset is recognized by ParaView as a structured
>> dataset? For instance, some simulation software packages produce always
>> unstructured dataset (e.g. OpenFOAM), even if you setup a completely
>> uniform grid.
>> Also some filter in ParaView produce unstructured grids (e.g. threshold
>> filter) no matter what the input type is.
>>
>> The grid type is easy to check from the Information panel in ParaView.
>>
>> -Armin
>>
>>
>>
>> On 05/12/2015 05:24 PM, Utkarsh Ayachit wrote:
>>> That's weird. What version of ParaView are you using on your Debian 8?
>>>
>>> On Tue, May 12, 2015 at 6:49 AM, Ufuk Utku Turuncoglu (BE)
>>> <u.utku.turuncoglu at be.itu.edu.tr> wrote:
>>>> Hi,
>>>>
>>>> I checked "Volume Rendering Mode" but i could not see it in my case. It
>>>> is
>>>> exist in my local laptop (Mac OS) but it is not in ParaView installed
>>>> under
>>>> Debian 8.0. I think that after selecting representation type to Volume,
>>>> it
>>>> must show up in the Properties menu. Right?
>>>>
>>>> --ufuk
>>>>
>>>>
>>>> On 11/05/15 17:47, Utkarsh Ayachit wrote:
>>>>>>
>>>>>> Is out of box ParaView binary
>>>>>> could use full capability of hardware or not?
>>>>>
>>>>> ParaVIew binaries don't ship with any OpenGL implementation. It uses
>>>>> whatever OpenGL drivers setup on the machine it's being run. So long
>>>>> as your environment is setup properly, ParaView will indeed use the
>>>>> hardware available. However, not all rendering techniques in ParaView
>>>>> will use the graphics card  -- as Armin alluded to. Your dataset seems
>>>>> like small enough that volume rendering should be pretty
>>>>> instantaneous. What is the "Volume Rendering Mode" on the Properties
>>>>> panel set to? It should be "Smart" by default -- that will ensure that
>>>>> the graphics card is used, if possible.
>>>>>
>>>>> Utkarsh
>>>>
>>>>
>>
>