[vtkusers] [EXTERNAL] Re: Java vtkPointToCellData
James Labiak
jim at jslengineeringsoftware.com
Tue Sep 22 09:35:12 EDT 2015
Hi Gerrick,
Yes, this is the problem; my cells are not being created by the
vtkPointDataToCellData filter. I'm trying to figure out why that filter
is not creating the cells from the point data that I supply it.
For the .vtp file, I was just trying to simplify the code sample. For
reference, to create it, I created vtkPoints with a sequential index
number + x,y,z coordinate values. Note that the index number has no
obvious relation to the ordering of points (ID's) that would create a
cell. However, it seems to me like this should be a common scenario in
the field. I also create a vtkFloatArray scalars array called
colorsScalars. Then, I do this:
// Create a new, empty polyData
polyData = new vtkPolyData();
// populate the polyData with the points
polyData.SetPoints(points);
// populate the polyData with the scalars
polyData.GetPointData().SetScalars(this.colorsScalars);
// Write the polyData to an XML-based ".vtp" format
// This gives an input file for a simpler test class
vtkXMLPolyDataWriter xmlWriter = new vtkXMLPolyDataWriter();
xmlWriter.SetInputData(polyData);
xmlWriter.SetFileName("C:\\vtk123\\test_data.vtp");
xmlWriter.Write();
Regards,
Jim
On 9/22/2015 8:35 AM, Gerrick Bivins 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] *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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