You can run the data through Histogram, then run the histo through
Include to keep only the bins that have at least N occurrences, then
Statistics to get the min/max pressures. Then feed your original data
through Include, using this min/max.
Joel
Jonathan Matheson wrote:
I can get a good image that way but I am looking for a way to do this
automatically. I am using it for a computational fluid dynamics
simulation so the pressure range is always different depending on the
shape and other parameters. Also, my cfd program calls dx once it writes
the dx files so the user can immediately see the image. Because the
pressure range depends on the individual problem you'd have to specify
the range each time which is not very practical. My range is so big now
that the good data (data outside the shape surface) appears all one
colour because it occupies a very small range of the colourmap. If I use
'statistics' to find the max and min it gives me the garbage values from
within the shape. I need to somehow use the boundary of the shape dx
file to exclude the data inside of it and then search for the max and
min outside. I can't find a way to split up the 'data' or get rid of
part of it. I can exclude all of it easily enough but that's certainly
no help.
Thanks,
Jon
Chris Pelkie wrote:
Using only the Colormap Editor (once you install Colormap and a Color,
double-click the Colormap module), you can modify the normally linear
colormap to any shape you want. You can also type in min and max
values right there to constrain what gets colored (it invalidates the
data outside your range, just like Include). So you can pretty quickly
trim outliers, or leave them in, but by adding new control points,
make a colormap that pushes all the colors down and up to wrap around
the 'good' data.
Note the 'histogram' function of Colormap Editor can help identify
where the 'good' data is.
To see all the above, you have to run the data flow from your imported
field into the 1st input of Colormap. Also run this same output to the
1st input of Color. Then run the 1st output of Colormap to 2nd input
of Color. Samples show this clearly.
On Aug 9, 2005, at 9:47 PM, Jonathan Matheson wrote:
I am importing 2 3D dx files into my .net program. One of them
contains pressure values in the ‘data’ field. The other shape file
has only ‘positions’ and triangular ‘connections’ fields with no
data. The pressure values within the shape are garbage and I need
to make my program ignore them. The problem is that outside of the
shape the pressures are all pretty close but inside they are
really high and really low. As a result of this my colour map does
not show the pressure differences outside the shape. I can
manually set the max and min values through the ‘include’ function
but dx is automatically called from another program and that is
not an option. I am looking for a way to search for the max and
min pressure values while ignoring those that are inside the
shape. If I could do that I can set those values in the ‘include’
function and everything will display properly.
Thanks,
Jon
_______________________________
Chris Pelkie
Scientific Visualization Producer
622 Rhodes Hall, Cornell Theory Center
Ithaca, NY 14853 (607) 254-8794
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Joel Richardson, Ph.D. Phone: (207) 288-6435
The Jackson Laboratory Fax: (207) 288-6132
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