[vtkusers] [EXTERNAL] Re: Java vtkPointToCellData
Gerrick Bivins
Gerrick.Bivins at halliburton.com
Fri Sep 25 13:21:07 EDT 2015
This one may also be of interest to you:
http://www.vtk.org/Wiki/VTK/Examples/Cxx/Filtering/Delaunay2D
Gerrick
From: James Labiak [mailto:jim at jslengineeringsoftware.com]
Sent: Friday, September 25, 2015 10:39 AM
To: Gerrick Bivins; Sebastien Jourdain
Cc: vtkusers
Subject: Re: [EXTERNAL] Re: [vtkusers] Java vtkPointToCellData
Hi Gerrick and Seb,
Thanks for all of your help so far, I appreciate it. I did try the vtkSurfaceReconstructionFilter. The resultant surface was kind of weird, but it had the basic shape. I will definitely experiment more with that. I will report back on that and a couple of other approaches.
Regards,
Jim
On 9/25/2015 10:11 AM, Gerrick Bivins wrote:
Hi James
Glad you got that part working.
It sounds like you want to do something like this:
http://www.vtk.org/Wiki/VTK/Examples/Cxx/Filtering/SurfaceFromUnorganizedPoints
Gerrick
From: James Labiak [mailto:jim at jslengineeringsoftware.com]
Sent: Friday, September 25, 2015 8:55 AM
To: Sebastien Jourdain; Gerrick Bivins
Cc: vtkusers
Subject: Re: [EXTERNAL] Re: [vtkusers] Java vtkPointToCellData
I got the verts to work and can plot the points, but am struggling to create a surface through the points. Any recommendations on an approach? The geometry is similar to: cut a rectangle through a sphere and slide the piece out; the sphere faces that remain are similar to my geometry (just small deviations), but I am focusing on simply trying to create one surface on one face.
On 9/22/2015 9:36 AM, Sebastien Jourdain wrote:
I wasn't sure at first based on your comment, but I don't think vtkPointDataToCellData is meant to create Cells.
And if you don't create any cell, then you won't be able to see anything.
You can create a single polyverts with all the points ids.
vtkCellArray verts = new vtkCellArray();
verts.InsertNextCell( points.GetNumberOfPoints() );
for(int i=0; i < points.GetNumberOfPoints(); i++) {
verts.InsertNextPoint(i);
}
polyDataWithCells.SetVerts(verts)
The code above, should create the expected cells. Just be aware that it was written in a mail with uncertainty regarding the method names and class names.
But that should be enough to get you started with an appropriate IDE.
Seb
On Tue, Sep 22, 2015 at 6:35 AM, Gerrick Bivins <Gerrick.Bivins at halliburton.com<mailto:Gerrick.Bivins at halliburton.com>> wrote:
The vtp file seems invalid. It looks like the cells aren’t defined.
Even if the polydata is just points, I think you still have to define the
“Verts” cell array of the polydata.
Gerrick
From: vtkusers [mailto:vtkusers-bounces at vtk.org<mailto:vtkusers-bounces at vtk.org>] On Behalf Of James Labiak
Sent: Monday, September 21, 2015 8:05 PM
To: Sebastien Jourdain
Cc: vtkusers
Subject: [EXTERNAL] Re: [vtkusers] Java vtkPointToCellData
Hi Sebastien,
I made the change, but it still seems not to be running the filter. Attached is a java file and a .vtp data file to see what's happening. Also below is the code.
Thanks,
Jim
package com.profiles;
import vtk.*;
public class PlotSomePolyDataFromFileRead {
public static void main(String[] args) {
try {
new PlotSomePolyDataFromFileRead();
} catch (Exception ex_new_PlotSomePolyDataFromFileRead) {
System.out.println("[main] Exception at new PlotSomePolyDataFromFileRead()");
ex_new_PlotSomePolyDataFromFileRead.printStackTrace();
}
}
// Load VTK libraries
static {
if (!vtkNativeLibrary.LoadAllNativeLibraries()) {
{
for (vtkNativeLibrary lib : vtkNativeLibrary.values()) {
if (!lib.IsLoaded())
System.out
.println(lib.GetLibraryName() + " not loaded");
}
System.out.println("Make sure the search path is correct: ");
System.out.println(System.getProperty("java.library.path"));
}
vtkNativeLibrary.DisableOutputWindow(null);
}
}
private PlotSomePolyDataFromFileRead() {
// Read the polyData from the data file
vtkXMLPolyDataReader xmlReader = new vtkXMLPolyDataReader();
xmlReader.SetFileName("C:\\vtk123\\test_data.vtp");
xmlReader.Update();
// Use the filter vtkPointDataToCellData to create the
// cells from the point data that's in the vtkPolyData from the reader
// *The vtkPolyData from the reader intentionally only includes vtkPoints
// and their scalars (that's the given data from the application output)
vtkPointDataToCellData polyDataCreateCells = new vtkPointDataToCellData();
polyDataCreateCells.SetInputConnection(xmlReader.GetOutputPort());
polyDataCreateCells.PassPointDataOn();
polyDataCreateCells.Update();
// In order to check if the vtkPointDataToCellData filter worked:
// Create new polyData, retrieve polyData (with cells now) from
// polyDataCreateCells filter, check values during debug operation
vtkPolyData polyDataWithCells = new vtkPolyData();
polyDataWithCells = polyDataCreateCells.GetPolyDataOutput();
// At this point, polyDataWithCells has (when I run it)
// point data but not cell data, nor scalar data
// and it should have all 3
vtkPolyDataMapper polyMapper = new vtkPolyDataMapper();
polyMapper.SetInputData(polyDataCreateCells.GetPolyDataOutput());
polyMapper.Update();
vtkActor polyActor = new vtkActor();
polyActor.SetMapper(polyMapper);
polyActor.GetProperty().SetColor(1.0, 1.0, 1.0);
vtkRenderer renderer = new vtkRenderer();
renderer.AddActor(polyActor);
renderer.SetBackground(0.0, 0.0, 0.0);
vtkRenderWindow renderWindow = new vtkRenderWindow();
renderWindow.AddRenderer(renderer);
renderWindow.SetSize(800, 800);
vtkRenderWindowInteractor renderWindowInteractor = new vtkRenderWindowInteractor();
renderWindowInteractor.SetRenderWindow(renderWindow);
renderWindow.Render();
renderWindowInteractor.Start();
}
}
On 9/21/2015 10:38 AM, Sebastien Jourdain wrote:
Try that
vtkPointDataToCellData polyDataCreateCells = new vtkPointDataToCellData();
polyDataCreateCells.SetInputData(polyData);
polyDataCreateCells.PassPointDataOn();
polyDataCreateCells.Update(); // <==== For the execution of the filter
// Create new polyData, retrieve completed polyData from polyDataCreateCells
vtkPolyData polyDataComplete = polyDataCreateCells.GetPolyDataOutput(); // No need to create a polydata just get a ref from the filter
On Mon, Sep 21, 2015 at 8:20 AM, James Labiak <jim at jslengineeringsoftware.com<mailto:jim at jslengineeringsoftware.com>> wrote:
Hello all,
I created a pipeline that seems to make sense to me, but always my polyDataComplete is empty. Any ideas why this code doesn't work? The only vtkPointToCellData example on the web that I can find uses blow.vtk, which doesn't exist on my 6.0.0 installation anywhere. The polyData variable gets correctly populated with the points and their scalars below.
// Create a new, empty polyData
polyData = new vtkPolyData();
// populate the polyData points
polyData.SetPoints(points);
// populate the polyData scalars
polyData.GetPointData().SetScalars(colorsScalars);
vtkPointDataToCellData polyDataCreateCells = new vtkPointDataToCellData();
polyDataCreateCells.SetInputData(polyData);
polyDataCreateCells.PassPointDataOn();
// Create new polyData, retrieve completed polyData from polyDataCreateCells
vtkPolyData polyDataComplete = new vtkPolyData();
polyDataComplete = polyDataCreateCells.GetPolyDataOutput();
vtkPolyDataMapper polyMapper = new vtkPolyDataMapper();
polyMapper.SetInputData(polyDataComplete);
polyMapper.ScalarVisibilityOn();
polyMapper.SetScalarRange(scalarMin, scalarMax);
polyMapper.Update();
vtkActor polyActor = new vtkActor();
polyActor.SetMapper(polyMapper);
polyActor.GetProperty().SetColor(1.0, 1.0, 1.0);
// ...Usual render stuff...
Thanks,
Jim
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