[vtkusers] representation of non-axis-aligned grids

[Jean M. Favre]

"Sherwood, P (Paul)" wrote:
> 
> Hi All
> 
> I am trying to figure out if it possible to store
> regular 2 and 2D grids of data (like vtkStructuredPoints but
> not necessarily axis-aligned) without falling back on
> vtkPolyData (where each point has explicit coordinates).

I have a special case of this where an affine transformation is applied
to the grid (a translation and shear). I am able to store my 3D data in
a vtkStructuredPoints and I apply a vtkTransform to my actors and
volumes, and all other relevant objects. My reader is derived from
vtkStructuredPointsSource and holds a vtkTransform as member. The code
then looks like this.

xform   [reader GetTransform]
volume  SetUserTransform xform
plane   SetTransform xform
actor   SetUserTransform xform

See the image of a small piece of DNA with its bounding box before- and
after- shear transformation.

-- 
Dr. Jean M. Favre,                            email:favre at cscs.ch
http://www.cscs.ch/people/Favre.html
CSCS, Swiss Center for Scientific Computing | Tel:  +41 (91) 610.82.40
Via Cantonale, 6928 Manno, Switzerland      | Fax:  +41 (91) 610.82.82
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