<div dir="ltr">Thanks for the Gerrick!<div>Will check it out at the first chance (couple of hours from now).</div><div><br></div><div>Is this to be set just once initially or with each slider move?</div><div><br></div><div>
<br></div><div>best regards,</div><div>Divya</div><div><br></div><div><br></div></div><div class="gmail_extra"><br clear="all"><div>"The difference between school and life? In school, you're taught a lesson and then given a test. In life, you're given a test that teaches you a lesson."</div>
<br><br><div class="gmail_quote">On Wed, Jan 29, 2014 at 11:06 PM, Gerrick Bivins <span dir="ltr"><<a href="mailto:Gerrick.Bivins@halliburton.com" target="_blank">Gerrick.Bivins@halliburton.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi Divya,<br>
<br>
I also found this a little "unintuitive". Even though you specify the same "contour index" in SetValue,<br>
<br>
you also need to make sure you set the number of contours to 1. Otherwise, the filter just continues to add them:<br>
<br>
<a href="http://www.vtk.org/doc/nightly/html/classvtkContourFilter.html#a5485ad7720282f2001fa6443c303003a" target="_blank">http://www.vtk.org/doc/nightly/html/classvtkContourFilter.html#a5485ad7720282f2001fa6443c303003a</a><br>
<br>
<br>
<br>
Hopefully that helps.<br>
<br>
Gerrick<br>
<br>
________________________________<br>
From: vtkusers [<a href="mailto:vtkusers-bounces@vtk.org">vtkusers-bounces@vtk.org</a>] on behalf of Divya Rathore [<a href="mailto:divyarathore@gmail.com">divyarathore@gmail.com</a>]<br>
Sent: Wednesday, January 29, 2014 11:06 AM<br>
To: <a href="mailto:vtkusers@vtk.org">vtkusers@vtk.org</a><br>
Subject: [vtkusers] Interactivly changing isovalue using slider<br>
<div><div class="h5"><br>
Hi All,<br>
<br>
I am trying to change the isovalue interactively in the medical2 sample. I am trying to use the 3D Slider example (<a href="http://www.vtk.org/Wiki/VTK/Examples/Cxx/Widgets/Slider" target="_blank">http://www.vtk.org/Wiki/VTK/Examples/Cxx/Widgets/Slider</a>) to do this.<br>
<br>
I have modified the above class vtkSliderCallback as:<br>
<br>
class vtkSliderCallback : public vtkCommand<br>
{<br>
public:<br>
static vtkSliderCallback *New()<br>
{<br>
return new vtkSliderCallback;<br>
}<br>
virtual void Execute(vtkObject *caller, unsigned long, void*)<br>
{<br>
vtkSliderWidget *sliderWidget = reinterpret_cast<vtkSliderWidget*>(caller);<br>
int value = static_cast<int>(static_cast<vtkSliderRepresentation *>(sliderWidget->GetRepresentation())->GetValue());<br>
this->contourFilter->SetValue(0, value);<br>
this->contourFilter->Update();<br>
this->polyDataNormals->Update();<br>
this->stripper->Update();<br>
this->polyDataMapper->Update();<br>
this->renderWindow->Render();<br>
}<br>
vtkSliderCallback():ImageActor(0)<br>
{<br>
contourFilter = NULL;<br>
polyDataNormals = NULL;<br>
stripper = NULL;<br>
polyDataMapper = NULL;<br>
renderWindow = NULL;<br>
}<br>
vtkContourFilter *contourFilter;<br>
vtkPolyDataNormals *polyDataNormals;<br>
vtkStripper *stripper;<br>
vtkPolyDataMapper *polyDataMapper;<br>
vtkRenderWindow* renderWindow;<br>
<br>
};<br>
<br>
<br>
main()<br>
{<br>
<br>
// read data<br>
// short data<br>
vtkSmartPointer<vtkImageReader> v16 = vtkSmartPointer<vtkImageReader>::New();<br>
v16->SetFileName(argv[2]);<br>
v16->SetFileDimensionality(3);<br>
v16->SetDataScalarTypeToUnsignedShort();<br>
v16->SetDataByteOrderToLittleEndian();<br>
v16->SetNumberOfScalarComponents(1);<br>
v16->SetDataExtent(0,width-1, 0,height-1, 0,depth-1);<br>
v16->SetDataSpacing (1.0, 1.0, 1.0);<br>
v16->Update();<br>
//..##<br>
<br>
// An isosurface, or contour value of 500 is known to correspond to<br>
// the skin of the patient. Once generated, a vtkPolyDataNormals<br>
// filter is is used to create normals for smooth surface shading<br>
// during rendering. The triangle stripper is used to create triangle<br>
// strips from the isosurface; these render much faster on may<br>
// systems.<br>
vtkSmartPointer<vtkContourFilter> Extractor =<br>
vtkSmartPointer<vtkContourFilter>::New();<br>
Extractor->SetInputConnection( v16->GetOutputPort());<br>
Extractor->ReleaseDataFlagOn();<br>
Extractor->SetValue(0, 10240.0);<br>
Extractor->Update();<br>
<br>
vtkSmartPointer<vtkPolyDataNormals> Normals =<br>
vtkSmartPointer<vtkPolyDataNormals>::New();<br>
Normals->SetInputConnection(grainExtractor->GetOutputPort());<br>
Normals->ReleaseDataFlagOn();<br>
Normals->SetFeatureAngle(60.0);<br>
Normals->Update();<br>
<br>
vtkSmartPointer<vtkStripper> Stripper =<br>
vtkSmartPointer<vtkStripper>::New();<br>
Stripper->SetInputConnection(grainNormals->GetOutputPort());<br>
Stripper->ReleaseDataFlagOn();<br>
Stripper->Update();<br>
<br>
vtkSmartPointer<vtkPolyDataMapper> Mapper =<br>
vtkSmartPointer<vtkPolyDataMapper>::New();<br>
Mapper->SetInputConnection(grainStripper->GetOutputPort());<br>
Mapper->ReleaseDataFlagOn();<br>
Mapper->ScalarVisibilityOff();<br>
<br>
vtkSmartPointer<vtkActor> surface =<br>
vtkSmartPointer<vtkActor>::New();<br>
surface->SetMapper(grainMapper);<br>
surface->GetProperty()->SetDiffuseColor(.66, .92, .33);<br>
surface->GetProperty()->SetSpecular(.3);<br>
surface->GetProperty()->SetSpecularPower(20);<br>
surface->GetProperty()->SetOpacity(1.0);<br>
<br>
<br>
// set up the slider<br>
vtkSmartPointer<vtkSliderCallback> callbackSlider = vtkSmartPointer<vtkSliderCallback>::New();<br>
callbackSlider->contourFilter = Extractor;<br>
callbackSlider->polyDataNormals = Normals;<br>
callbackSlider->stripper = Stripper;<br>
callbackSlider->polyDataMapper = Mapper;<br>
callbackSlider->renderWindow = renWin;<br>
<br>
//..<br>
// other aspects as covered in the above URL<br>
//..<br>
<br>
// Finally add observer<br>
sliderWidgetSCP->AddObserver(vtkCommand::EndInteractionEvent, callbackSlider);<br>
<br>
}<br>
<br>
<br>
<br>
As such the interactivity pipeline is in place. But the problem is that on moving the slider the previous iso-values are not clearing and the surfaces keep on adding up (the shown surface keeps growing, obviously it all having the same color due to the call this->contourFilter->SetValue(0, value))<br>
<br>
What am I missing here? I want just that iso-value to be shown that the slider reflects.<br>
<br>
best regards,<br>
Divya<br>
<br>
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</blockquote></div><br></div>