Yes, I know, It's impossible to obtain an isosurface with the maximum
value,
but I want just use it in order to compute a new value (max - 0.1 for
example) and use this new value for threshold.
So my actual problem is how create the contour ?
I tried with :
cf = vtk.vtkContourGrid()
cf.SetInputConnection(pdo)
cf.SetValue(1,0.1)
I didn't obtained some images. Perhaps I need some lines code with
self.GetPolyDataOutput() ?
Thank you.
PS: Sorry for the delay of the response, I was out of my office during
the last weeks.
Guillaume
On 24/09/2010 23:28, Favre Jean wrote:
Using the maximum value of any scalar field as the threshold for an isosurface
will always give a null object. In fact, the smallest isosurface you could ever
construct is a single triangle, intersecting 3 edges connecting one vertex
greater than your threshold, and three other vertices below your threshold.
this is the second case in this figure:
http://en.wikipedia.org/wiki/File:MarchingCubes.svg
you should rethink your strategy of using the maximum value as input threshold.
That being said, there is a much faster way to get the range (the min and
maximum) of a scalar field from within the Pogrammable Filter. Simply use
GetRange()
max = temperature.GetRange()[1]
-----------------
Jean M. Favre
Swiss National Supercomputing Center
Hi everybody,
I begin with Paraview and I would like to have a variable input (like
the maximum temperature at each time step) for the isosurface into the
contour filter.
In this way, I created a programmable filter to get the maximum
temperature :
pdi = self.GetPolyDataInput()
pdo = self.GetPolyDataOutput()
numPoints = pdi.GetNumberOfPoints()
temperature = pdi.GetPointData().GetArray("temperature")
max=-1.0
for i in range(0, numPoints):
if (max < temperature.GetValue(i)):
max = temperature.GetValue(i)
print(max)
But, now my problem is how create the contour filter ?
I tried with :
cf = vtk.vtkContourGrid()
cf.SetInputConnection(pdo)
cf.SetValue(1,0.1)
but I didn't obtained some images. Perhaps I need some lines code with
self.GetPolyDataOutput() ?
Thanks in advance,
Guillaume
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