[vtkusers] Finite Element Grid Visulization

[Will Schroeder]

Davood-

There is merit to much of what you propose. Just a couple of notes if 
you want to get fancy:

+ VTK has a higher-order framework that you should be aware of 
http://www.vtk.org/pdf/AdaptorFramework.pdf. We have used it to 
visualize mixed polynomial order cells (the framework supports any cell 
that can be uniquely parameterized). It requires you to write an 
adapter, which takes some work.(Remember, Kitware is in the business of 
consulting/support if this looks too hard to do yourself).
+ Transparency is always an issue; VTK now supports unstructured grid 
volume rendering (requires tetrahedrization first). Look at the file 
fire_05_11_08.avi in http://paraview.org/files/data/ if you want to see 
an absolutely stunning video clip of fire simulation using VTK's 
unstructured grid volume rendering. My understanding is that is was 
generated on a 120 distributed processor system.

(Kudos to the Sandia Nat'l lab folks who contributed much of this 
technology to the VTK community.)

Will


Davood Ansari wrote:
> Hi every one
>  
>  
> I have some very high order elements and I want to visulize the mesh 
> (FEM mesh mesh ).
>  Let's assume that my element are rectilinear all. Then the problem is 
> that I want to visulize
> them in different ways and in some cases I want the nodes (boundary 
> and/or internal) nodes
> to be observavle (as small  dots).
> Now I guess I should do it in the following way. See if I am right in 
> this regard.
>  
> 1.Make low order elements and make the faces transparent (is this 
> possible, how?)
> 2.Then add extra cells to the grid. These cells should represent a 
> node each (including those that fall inside the element).
> 3.Make the faces of the elements transparent to some extent.
>  
> If this is not right then how can I realize my high order elements 
> (with their nodes) ?
>  
>  
> I have seen a figure that shows a delunary trinagulation of random 
> points using vtk. There the grid is  visulized as
> nodes (small spheres) connected with lines (actually pipes). But the 
> example that
> mentions the figure in the book uses the regular vtkUnstructuredGrid. 
> While other exmples
> of the unstructured gird are visulized in a different way (elements 
> have observable faces)?!!
> Can we control the way grid cells are visualized ? Can it be done in a 
> different way from one cell
> to another ?
>  
> Many thanks in advance
> Davood Ansari O.B.
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