[vtkusers] Surface Rendering from point set.

[Alex Liu]

Hello World! 
I'm working on a project in which I'm given DICOM files. I've extracted the
DICOM images to openCV. 
>From openCV I've extracted Points for each DICOM Image/Slice. I'm trying to
construct a 3D view of the detected face Points. As I'm new to VTK I'm
facing some problems.

I've Points(x,y,z) for all the images right now. and I can display the
points on the screen, please see the attachment. 

Point Cloud Face
<http://vtk.1045678.n5.nabble.com/file/n5741245/Point_Cloud_Face.png> 

Right now I want to calculate Normals for all the points with Normals facing
out from the face. In MeshLab there is a function to calculate Normals for
points set. And i get this result 

MeshLab Point set Normals
<http://vtk.1045678.n5.nabble.com/file/n5741245/MeshLab_Points_With_Normals.png> 

My Code. 

vtkSmartPointer<vtkPolyData> polyData = vtkSmartPointer<vtkPolyData>::New(); 
polyData->SetPoints(vtkPts);  // vtkPts contains all the points in x, y, z
of the face. 

vtkSmartPointer<vtkVertexGlyphFilter> glyphFilter =
vtkSmartPointer<vtkVertexGlyphFilter>::New(); 
glyphFilter->SetInputData(polyData); 
glyphFilter->Update(); 

// Im not sure here if Im using the right function to calculate Points
Normals 
// But I get the same output in blue as in attached image
MeshLab_Points_With_Normals.png 
vtkSmartPointer<vtkPolyDataNormals> polyDataNormals =
vtkSmartPointer<vtkPolyDataNormals>::New(); 
polyDataNormals->SetInputConnection(glyphFilter->GetOutputPort()); 
polyDataNormals->FlipNormalsOff(); 
polyDataNormals->ComputePointNormalsOn(); 
polyDataNormals->Update(); 


vtkSmartPointer<vtkPolyDataMapper> mapper =
vtkSmartPointer<vtkPolyDataMapper>::New(); 
mapper->SetInputConnection(glyphFilter->GetOutputPort()); 


// Display image 
vtkSmartPointer<vtkPolyDataMapper> mapper =
vtkSmartPointer<vtkPolyDataMapper>::New(); 
mapper->SetInputConnection(glyphFilter->GetOutputPort()); 

vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New(); 
actor->SetMapper(mapper); 
actor->GetProperty()->SetColor(0.0, 0.0, 0.9); //(R,G,B) 

vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New(); 
renderer->AddActor(actor); 
renderer->SetBackground(0.9, 0.9, 0.9); // Background color Gray 

vtkSmartPointer<vtkRenderWindow> renderWindow =
vtkSmartPointer<vtkRenderWindow>::New(); 
renderWindow->AddRenderer(renderer); 
renderWindow->SetPosition(400, 200); 
renderWindow->SetSize(612, 612); 

vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
vtkSmartPointer<vtkRenderWindowInteractor>::New(); 
renderWindowInteractor->SetRenderWindow(renderWindow); 
renderWindowInteractor->Start(); 


I'm trying to get output like in MeshLab, with a smooth surface.
Help will be really appreciated. 

Thank you. 
Alex 



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Alex Liu
+15574855474
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