[vtkusers] speed

[Will Schroeder]

I have loaded VTK data files with well over 1.5 million vertices and
7.5 million tetrahedra in well under a minute (with associated scalars
and vectors). I was using binary files and a custom reader that loaded 
the data - and once read - assigned the data with a pointer
reference. If you are using Tcl calls to load data one point or one cell
at a time you're going to be slow, and of course ASCII hurts as well.

Will

At 05:55 PM 8/2/00 +0200, Thomas Wolfanger wrote:
>Hello all,
>
>I have some questions concerning speed of execution of vtk. Since I´m
>not very familiar with vtk programmin, I´m using the VisuSimple scripts
>by R. Riviere and R. Becker written in tcl. 
>I have a cfd simulation file with about 220000 points in an unstructured grid
>and the same number of points for each result variable (velocity vector,
>pressure, density).
>Trying to look at the grid alone takes about half an hour to load the data and
>create the image on an 700 MHz Athlon running Linux. Once created, rotating,
>zooming etc. work quiet well and fast.
>Reading variables takes a much more longer time (I´ve waited for about 2 hours,
>but nothing happened yet...). I´m using an ASCII dataset, because I´m not able
>to output in binary form. Could this be the reason for the poor performance?
>Otherwise, are there any calculations going on (extrapolation of data?) and is
>it possible to find out where the program is spending the time ?
>Sorry if the questions appear too diffuse,
>
>Mit freundlichen Grüßen / Best regards
>
>##############################################################
>#                     Thomas Wolfanger                       #
>#                  Turbo-Lufttechnik GmbH                    #
>#                    t.wolfanger at tlt.de                      #
>#                 Tel.: ..49/6332-808 425                    #
>#                 Fax : ..49/6332-808 357                    #
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