[Paraview] Octree Mesh

[Ivo Roghair]

Hi,

With respect to the slicing; you could try to use the Extract Cells By 
Region filter, instead of the slice filter; my structured grid -- 
consisting of cubic cells -- is then sliced in the expected way keeping 
the cell structure as it was, whereas the slice tool seems to create an 
unstructured mesh first hereby generating additional edges, resulting in 
the triangular mesh that you see.

I'm also looking for a robust way to write out my OctTree meshes. Here's 
how I do it now, assuming cubic cells;

Create a point dataset (.vtp, .csv, .vtk) with a variable called 'size', 
the point coordinates at the cell centers. Then generate a glyph on this 
dataset, set it to cubes with size of course the variable that you have 
in the file. You can of course color the glyphs with any other variable 
in your dataset.

This saves you the trouble of generating 8 points per cubic cell and 
conncting them properly in your output files as you would in an 
unstructured mesh datafile. But still I'm convinced that there is 
(should be) an easier way of doing this.

Best,
Ivo


Mohammad Mirzadeh wrote:
> Dear all,
>
> I am rather new to paraview and I work in the area of CSE. The typical 
> meshes that I use to discretize my PDEs over is the 3D Octree data 
> structure. I was just wondering if anyone is aware of a dedicated 
> dataset in paraview to handle such meshes? I can go ahead and export 
> my data in a way that can be loaded as an unstructured dataset, but 
> I'd prefer to use a specific dataset for Octrees. 
>
> One more question. When I use, say, a simple structured 3D mesh and 
> use the slice filter to generate the corresponding mesh on a 
> surface(through wireframe) it just shows me some extra diagonal lines 
> on each square cell, which it should not.
>
> Any help will greatly be appreciated.
>
> Best,
> -M
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