[vtkusers] Combining three velocity components

[Wes Turner]

Did you try ImageAppendComponents?
http://www.vtk.org/doc/nightly/html/classvtkImageAppendComponents.html

<http://www.vtk.org/doc/nightly/html/classvtkImageAppendComponents.html>-
Wes

On Fri, Jul 31, 2009 at 12:16 PM, Adam Wiktor <awiktor at emory.edu> wrote:

> Hi All,
>
> I am fairly new to VTK, so please bear with me. I'm trying to visualize
> blood flow in the aorta from MRI scans. The velocity data is stored in three
> separate vti images, for the x-, y- and z- components. Each image has a
> scalar variable 'DICOMImage' which is the speed in that direction. I need to
> combine the components into the overall velocity, which I will then import
> into paraview to add streamlines and other things.
>
> My original thought was to use the vtkArrayCalculator to multiply each
> image by the unit vector (for the x component, for example, it would be
> DICOMImage*iHat). I would then need to combine these vectors into the
> velocity with another calculator, just doing x+y+z. I might be able to
> simplify this by just using one calculator that did x*iHat + y*jHat +
> z*kHat, but I don't know how to change the variable names from DICOMImage to
> x, y, and z so that the calculator can distinguish between them.
>
> First of all, I'd like to know if there's an easier way of doing this.
>
> If there isn't a more straight-forward way, then the main thing I need to
> figure out is how to get the final calculator to use the three different
> inputs. What would be the best way to do that?
>
> Thanks for any help you can give!
>
> - Adam
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-- 
Wesley D. Turner, Ph.D.
Kitware, Inc.
R&D Engineer
28 Corporate Drive
Clifton Park, NY 12065-8662
Phone: 518-371-3971 x120
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