<div dir="ltr"><div>I try to build streamline using this code:<br><br>vtkPoints points = new vtkPoints();<br>      points.SetDataTypeToDouble();<br>      double sizeMaxField = aValue;<br>    <br>      vtkDoubleArray vector3DArray = new vtkDoubleArray();<br>      vector3DArray.SetNumberOfComponents(3);<br>      vector3DArray.SetName("Vector");<br>      <br>      for (int i = 0; i < grid.getCellNumber(); i++) {<br>        Vector3D fieldValue = (Vector3D) getValue(i);<br>       <br>          Point3D p = (Point3D) grid.getCellBarycenter(i);<br>          points.InsertNextPoint(p.x, p.y, p.z);<br>          vector3DArray.InsertNextTuple3(fieldValue.x, fieldValue.y, fieldValue.z);<br>       }<br>      vtkPolyData polyData = new vtkPolyData();<br>      polyData.SetPoints(points);<br>      polyData.GetPointData().SetVectors(vector3DArray);<br><br>    <br>      <br>   // Create the source points for the streamlines <br>      vtkPointSource pointSource = new vtkPointSource();<br>      Point3D center = Point3D.barycenter(grid.getOrigin(), grid.getExtremalPoint());<br>      pointSource.SetCenter(center.x, center.y, center.z);<br>      pointSource.SetRadius(grid.getExtremalPoint().distance(grid.getOrigin())/2.);<br>      pointSource.SetDistributionToUniform();<br>      pointSource.SetNumberOfPoints(1500);<br>      pointSource.Update();<br>      <br>      <br>      <br>      tracer = new vtkStreamTracer();<br>      tracer.SetSourceData(polyData);<br>      tracer.SetSourceConnection(pointSource.GetOutputPort());<br>      tracer.SetMaximumPropagation(100);<br>      tracer.SetInitialIntegrationStep(1);<br>      tracer.SetIntegrationDirectionToForward();<br>      tracer.SetComputeVorticity(false);<br>      tracer.SetIntegrator(new vtkRungeKutta4());<br>      tracer.Update();<br>      streamTube = new vtkRibbonFilter();<br>      streamTube.SetInputConnection(tracer.GetOutputPort());<br>      streamTube.SetWidth(5);<br>      streamTube.SetWidthFactor(5);<br>      streamTube.Update();<br><br><br>        mapper = new vtkPolyDataMapper();<br>        mapper.SetInputConnection(streamTube.GetOutputPort());<br><br><br><br></div>I don't see nothing!!!! Some body can help me?<br></div>