Hi Eric,

Thanks a lot,

Your sugestion is working for my problem, However it's accuracy is not good enough. (I must say that I haven't played much with the parameters).

I used a code to intorpolate my field on a regular grid and then imported the output to paraview. the code is called easygrid.

I've attached two figres for comparison.

Best,

Nima.

On Mon, Nov 30, 2009 at 10:36 PM, Eric E. Monson <emonson <at> cs.duke.edu> wrote:

Hey Nima,

I don't know if this will be a useable solution for you, but based on your notes I tried generating a point cloud (centered on the origin, 100 points with radius 10) in ParaView, then using the calculator filter I generated a scalar value on each node which is the magnitude of the x, y, z coordinate vector: mag(coords). Instead of trying to sample the data points onto a regular grid, I used the Delaunay3D filter (with default parameters) to generate tetrahedra, which can be used for volume visualization, contouring, etc. Here is a screen shot of the point cloud colored by that vector magnitude (blue-white-red colormap), and six contours which have been clipped to show the insides.

Again, not sure if this is the type of solution you were looking for, but it interpolates the vector magnitude values and allows you to generate contours.

Talk to you later,

-Eric

------------------------------------------------------

Eric E Monson

Duke Visualization Technology Group

<ScatterPointsContours.png>

On Nov 28, 2009, at 3:25 PM, Nima Emadi wrote:

Thanks a lot Sven,
I could generate vector plots. Still trying to find a way to do 3D contour plots for my scattered points. As you said I need to have a mesh and to interpolate my scalar value to nodes of that mesh. Does anyone have an idea to do that?

Best,
Nima.

On Sat, Nov 28, 2009 at 1:07 PM, Sven Buijssen <sven.buijssen <at> tu-dortmund.de> wrote:

Nima,

Your first question has been discussed last month on this list, have a look at
http://markmail.org/message/36223zg4uleibiyj. David found the time to put the
question in FAQ style into the ParaView wiki. So, you can also look at
http://www.paraview.org/Wiki/Display_points_and_normals_from_a_plain_text_(x_y_z_nx_ny_nz)_file

I haven't faced the problem yet you describe in your second question. I'm
guessing you'll have to import your scattered data into ParaView (e.g. as CSV
data) and somehow come up with a regular grid in ParaView. This might be
possible using a Programmable Source or Sources - Data Object Generator, but I'm
not sure of that. Maybe someone else can point this out. Once you have a regular
grid, use the Resample with Dataset filter to interpolate your point data set(s)
to the regular grid and apply the Contour filter.

Hope this helps.

Sven


Nima Emadi wrote, On 11/28/2009 12:01 PM:

> Dear all,
> I would like to generate 3D vector plots from a set of scattered data in
> space (an ASCII file with x,y,z,u,v,w). I guess this should be rather
> simple, but later on I want to generate 3D contour plots out of my data
> (e.g. having contours based on the value of u^2+v^2+w^2 at each point).
> Since I just have the value on scattered points in space, making those
> contours will probably require extrapolation of my data to nodes of a
> (regular) mesh. My question is that, how can I do those plots? with
> which format should I import my data? Is paraview able to make contour
> plots with scattered data points in 3D?
>
> Thanks,
> Nima
>
>

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