[Paraview] Fwd: VTK interpolation help

[Ruggiero Guida]

Thanks Ken.

Got it. It makes sense. It seems that the only way to improve the quality
is to have a finer grid and a more detailed calculation of the amount of
radiation (the previous image included only the direct). New images are at
this link

https://www.dropbox.com/s/z9m2nr7ybj5mqqp/finermesh.zip?dl=0

I was wondering whether there was a way to at least smooth the results (see
other attached image). I have looked at the filters available, but there is
no such thing. When I import these results onto StarCCM I definitely see a
smoother interpolation.

Thanks
Ruggiero

On 26 September 2014 19:01, Moreland, Kenneth <kmorel at sandia.gov> wrote:

>   Yes, ParaView will use the triangles to interpolate values between
> points. The interpolation you are getting is exactly as I would expect
> based on your data and topology. I'm not sure what you mean by "not
> [interpolating] in the x,y directions". The triangles are in the x-y plane
> and interpolation is happening in this x-y plane.
>
>  Moving into guesswork, I am imagining that you are expecting a smooth
>  and fairly straight contour at some distance from the buildings. The
> reason you don't see this is due to the representation in your data. I
> notice that your data contains only two values for "RadiationOnPerson." The
> value is either 0 or 205.7. Presumably there is some contour in space where
> this field discontinuously transitions from 0 to 205.7, but there is no way
> to accurately predict where that is from the data you are providing.
> Instead, ParaView is just linearly interpolating between these values,
> which is wrong but probably the best you can do with the data provided. The
> problem is made even worse by the irregular sampling of the field.
>
>  -Ken
>
>   From: Ruggiero Guida <ruggiero.guida at gmail.com>
> Date: Thursday, September 25, 2014 at 10:44 PM
> To: "paraview at paraview.org" <paraview at paraview.org>
> Subject: [EXTERNAL] [Paraview] Fwd: VTK interpolation help
>
>    Dear group,
>
>  I hope I will be able to find an answer to my problem here.
>
>  I am not sure I understand how the interpolation works. I have generated
> a VTK file (attached) and I am trying to visualizing it in Paraview. The
> data represent the solar radiation on the ground around various buildings.
>
>  My algorithm calculates the radiation in each node of a constrained
> delauney triangulation. The plan is to visualize this in paraview to have a
> nice smooth fillled contour.
>
>  The image I get though, does not make sense to me; it seems that
> paraview is interpolating only within the triangles and not in the x,y
> directions. Am I missing something?
>
>  Thanks a lot for any help
>  Ruggiero
>
>
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