[vtkusers] Flattening a probed surface
Jonathan Ruiz Peinado
jonathan.ruiz3 at gmail.com
Wed May 30 10:00:50 EDT 2012
Yes, now it's getting the array correctly, thanks!
2012/5/30 Sebastien Jourdain <sebastien.jourdain at kitware.com>
> Try to update the pipeline before accessing its data...
>
> On Wed, May 30, 2012 at 8:50 AM, Jonathan Ruiz Peinado
> <jonathan.ruiz3 at gmail.com> wrote:
> > No , actually sampleVolume.GetOutput() doesn't have a
> method GetScalars(),
> > and sampleVolume.GetOutput().GetPointData().GetScalars() returns null.
> >
> > Maybe I wrote it wrong in a previus mail.
> >
> > ¿ But could I get the scalars from the volume using the surface points as
> > reference ?
> >
> > // Probe the volume with the extruded surface
> > meshedSurface.SetInputConnection(1,
> > dicomImage.getNormalized().GetOutputPort());
> > meshedSurface.SetInput(0, surface);
> >
> > Scalar =
> >
> dicomImage.getNormalized().GetOutput().GetScalarComponentAsDouble(surfacecoord.x, surfacecoord.x, surfacecoord.x,
> > 0);
> >
> > 2012/5/30 Sebastien Jourdain <sebastien.jourdain at kitware.com>
> >>
> >> You previously told me that the following line was working
> >>
> >> sampleVolume.GetOutput().GetScalars()
> >>
> >> BTW sampleVolume is not a volume but a meshed surface.
> >>
> >> On Wed, May 30, 2012 at 6:41 AM, Jonathan Ruiz Peinado
> >> <jonathan.ruiz3 at gmail.com> wrote:
> >> > An update of the previous code, seems that setDimensions is going to
> >> > be deprecate at some point and is just for backwards compatibility so
> >> > this
> >> > is how it's looks now using setExtent instead:
> >> >
> >> > //image_data.SetDimensions(width, height, 1);
> >> > image_data.SetExtent(0, width - 1 ,0, height - 1, 0, 0);
> >> > image_data.SetScalarTypeToDouble();
> >> > image_data.SetNumberOfScalarComponents(1);
> >> > image_data.SetSpacing(1.0, 1.0, 1.0);
> >> > image_data.SetOrigin(0.0, 0.0, 0.0);
> >> > image_data.SetScalarComponentFromDouble(0, 0, 0, 0, 200.0);
> >> > image_data.AllocateScalars();
> >> >
> >> > Now I'm trying to figure out how to get the scalars from the probed
> >> > surface
> >> >
> >> > sampleVolume.GetOutput().GetPointData().GetScalars() it's returning
> me a
> >> > null pointer...
> >> > any suggestion?
> >> >
> >> > 2012/5/30 Jonathan Ruiz Peinado <jonathan.ruiz3 at gmail.com>
> >> >>
> >> >> Ok, so I misunderstand some basics of VTK.
> >> >> I'm not sure about the meaning of cell or point, thanks it shows me
> >> >> something more about it.
> >> >> Is there some URL where I can go to get the basic theory about it ?
> >> >>
> >> >> This is how the code looks now, fisrt I'm going to show you how I'm
> >> >> Building the surface:
> >> >>
> >> >> rows = spline.GetOutput().GetNumberOfPoints();
> >> >> col =dicomImage.getNormalized().GetOutput().GetDimensions()[2];
> >> >> for (int row = 0; row < rows; row++)
> >> >> {
> >> >> for (int col = 0; col < cols; col++)
> >> >> {
> >> >> double [] p = new double [3];
> >> >> line.GetPoint(row, p);
> >> >> x[0] = p[0] + direction[0] * col * spacing;
> >> >> x[1] = p[1] + direction[1] * col * spacing;
> >> >> x[2] = p[2] + direction[2] * col * spacing;
> >> >> points.InsertPoint(cnt++, x);
> >> >> }
> >> >> }
> >> >>
> >> >> An now how I've fixed the code that was wrong in my previous message:
> >> >> vtkImageData image_data= new vtkImageData();
> >> >>
> >> >> int width = spline.GetOutput().GetNumberOfPoints();
> >> >> int height =
> dicomImage.getNormalized().GetOutput().GetDimensions()[2];
> >> >>
> >> >>
> >> >> image_data.SetDimensions(width, height, 1); // 1 because I just want
> an
> >> >> slice by now
> >> >> //image_data.SetSpacing();
> >> >>
> >> >>
> >> >> Do I need to set the Spacing of the image_data or it has a valid
> >> >> default
> >> >> value?
> >> >>
> >> >>
> >> >>
> >> >>
> >> >> 2012/5/29 Sebastien Jourdain <sebastien.jourdain at kitware.com>
> >> >>>
> >> >>> The dimension is related to the number of points....
> >> >>>
> >> >>> Meaning one dimension will be the number of points that compose your
> >> >>> spline and the other will be the number of iteration the swipe is
> >> >>> doing.
> >> >>>
> >> >>> Seb
> >> >>>
> >> >>> On Tue, May 29, 2012 at 12:46 PM, jruiz <jonathan.ruiz3 at gmail.com>
> >> >>> wrote:
> >> >>> > Thanks, I'm going to follow your instructions step by step, first
> >> >>> > I'm
> >> >>> > trying
> >> >>> > to get de surface area to set the dimension of the image data.
> >> >>> >
> >> >>> > Is it even close ? I'm getting the length for the extruded spline
> as
> >> >>> > "width"
> >> >>> > and "height" is the length of the extrusion. I guess this values
> >> >>> > need
> >> >>> > to be
> >> >>> > multiply by the spacing what I get from the source image.
> >> >>> >
> >> >>> > vtkImageData image_data= new vtkImageData();
> >> >>> >
> >> >>> > double[] spacing =
> >> >>> > dicomImage.getNormalized().GetOutput().GetSpacing();
> >> >>> >
> >> >>> > double width = spline.GetLength() * spacing[0];
> >> >>> > double height = surfaceHeight * spacing[2];
> >> >>> >
> >> >>> > image_data.SetDimensions(width, height, 1);
> >> >>> >
> >> >>> > --
> >> >>> > View this message in context:
> >> >>> >
> >> >>> >
> http://vtk.1045678.n5.nabble.com/Flattening-a-probed-surface-tp5713443p5713466.html
> >> >>> > Sent from the VTK - Users mailing list archive at Nabble.com.
> >> >>> > _______________________________________________
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> >> >
> >
> >
> >
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