[vtkusers] [EXTERNAL] Re: Java vtkPointToCellData

Fri Sep 25 10:11:43 EDT 2015

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.

[cid:image001.jpg at 01D0F772.31EC5A50]
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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