[Paraview] Re: Visualizing Vector Fields ...

[Hari Sundar]

Hi Luis,

thanks, it works. I was wondering if it was possible to visualize the
deformation field as a deformed grid., i.e., zero deformation means a
normal structured grid, and to this I apply my deformation field.

Is this possible in Paraview ?

thanks,
-Hari

On Thu, 19 Feb 2004, Luis Ibanez wrote:

>
> Hi Hari,
>
>
> You probably are using now ParaView 1.2.1
> (which is an updated release).
>
>        http://www.paraview.org
>
>
> A couple of things have changed in ParaView since
> the message below was posted in december 2003.
>
>
> For example:
>
>
> 1) Now you can read MetaImage fileformat directly
>     (they can contain scalar or vector images)
>
> 2) ExtractVOI is now called ExtractGrid
>     (as you already noticed)
>
>
> The simple way of visualizing deformation fields now is to
> load your MetaImage file containing the vector image and
> directly select the filter "Glyph", and in the options of
> the glyph filter set:
>
>    a) Orient Mode = Vector
>    b) Scale Mode  = Vector Magnitude
>    c) Scale Factor = play with this value to scale your vectors
>
>
> The reason for using ExtractGrid is to subsample the original
> vector image. This is only needed if your deformation field
> has a large number of pixels (~ high resolution). Otherwise
> you can simply use the Glyph filter connected directly at the
> output of the reader.
>
>
>
> Please let us know if you find any problems.
>
>
>
> Thanks
>
>
>     Luis
>
>
>
> -------------------------
>
>
> Hari Sundar wrote:
>
>  > Hi,
>  >
>  > I have been using ITK to output some deformation fields and tried to use
>  > paraview to visualize the deformation vectors. I based this on this post
>  > by Luis Ibanez
>  >
>  > http://www.itk.org/pipermail/insight-users/2003-December/005865.html
>  >
>  > However, I have been unable to get this to work properly. Firstly, I do
>  > not get an option to set the scale mode to scalar. I tried all the other
>  > options and still don't see anything. If I set the scale to "Dat Scaling
>  > Off", I can see the allows, but they are all aligned in the same
> direction
>  > (+ve X axis). My deformation fields are all right, because I wrote it out
>  > like and image (x,y,z = r,g,b) and it does display something ...
>  >
>  > What do I need for the glyph to display properly.
>  >
>  > thanks,
>  > -Hari
>  >
>  > PS: I used ExtractGrid in place of ExtractVOI.
>  >
>
>
>
>
>
> _______________________________________________
> ParaView mailing list
> ParaView at paraview.org
> http://www.paraview.org/mailman/listinfo/paraview
>

-----------------------------------------------------------------------
       Home				       Work
-----------------------------------------------------------------------
 375-C Buell Apartments,		   Dept. of ECE
 23909 BPO Way,				   Rutgers University
 Rutgers University,			   96 Frelinghuysen Road
 Piscataway, NJ 08854			   Piscataway, NJ 08854
 ph: (732)878 0424			   ph: (732)445 0564
-----------------------------------------------------------------------