[ANAG] [anag-cvs] [chombousers] Re: [Paraview] CHOMBO file converter for PARAVIEW

[Burlen]

Thanks Terry, I am familliar with the paper. in passing my algorithm doesn't 
involve stitching as described in the paper. Although the ordered contour 
class does exist in VTK 5, I haven't seen it's implementation in paraview as 
of yet(some one please correct me on that if I'm wrong). The hierarchical 
data produced by the hierarchical fractal source in PARAVIEW for instance is 
still subject to the visualization errors described in the paper you 
mentioned and my last mail. That & the lag in documentation of VTK's new 
classes, cell types and iso-surface algorithms lead me to write the 
converter. by doing so I could have the error free visualization that I relly 
on for debugging my CHOMBO codes now. 

burlen

On Tuesday 25 April 2006 04:04 pm, Terry J. Ligocki wrote:
> > Despite the new classes included with VTK my converter may be of use
> > in the short term. here is why...In the process of developing my
> > converter I encountered a number of instances where VTK's defaults
> > applied to multiresolution data produce erroneous visualizations...
>
> You (and others) might be interested in this paper, "Extraction of
> Crack-Free Isosurfaces from AMR Data"
> <http://graphics.idav.ucdavis.edu/publications/print_pub?pub_id=131>
> (and Gunther Weber's PhD thesis).  This work was the result to trying to
> produce artifact free visualizations of AMR data while minimizing the
> changes to the structure of the data.
>
> This was done by a form of "stitching" which appears similar to what you
> are doing.  The method was straightforward in 2D (although higher
> refinement ratios, 4:1 or 8:1, still were challenging, ;-) but in 3D
> things got fairly complicated.  In one case, an additional
> (interpoloted) data point needed to be added to complete the stitching.
>
> Although the paper focuses on contours/isosurfaces, the method can be
> applied to a wide variety visualization techniques...
>
>        Terry J. (Ligocki, tjligocki at lbl.gov)

-- 

Burlen Loring
Space Science Center
Institute for the Study of Earth, Oceans, and Space
University of New Hampshire
39 College Road, Durham, NH 03824
Phone: 603-862-1140