Hi all
I want to make the height map for c++ image buffer.
to
This is what I have done upto now.
- using vtkDelaunay2D
int nImageWidth = 500, nImageHeight = 1000;
BYTE* pBuffer = new BYTE[nImageWidth*nImageHeight];
vtkNew<vtkPoints> points;
for (int y = 0; y < nImageHeight ; y++) {
for (int x = 0; x < nImageWidth ; x++) {
double dData = (double)pBuffer[(nImageWidth * y) + x];
points->InsertNextPoint(x, y, dData);
}
}
vtkNew<vtkPolyData> inputPolyData;
inputPolyData->SetPoints(points);
vtkNew<vtkDelaunay2D> delaunay;
delaunay->SetInputData(inputPolyData);
delaunay->Update();
vtkNew<vtkPolyDataMapper> mapper;
mapper->SetInputData(delaunay->GetOutput());
vtkNew<vtkActor> actor;
actor->SetMapper(mapper);
vtkNew<vtkRenderer> renderer;
renderer->AddActor(actor);
renderer->SetBackground(.1, .2, .3);
renderer->ResetCamera();
m_vtkRenderWindow->AddRenderer(renderer);
m_vtkRenderWindow->Render();
The above method has two problems.
First: ‘delaunay->Update()’ takes too much time.
Second: Large images cannot use the above method.
- using vtkImageImport
int nImageWidth = 500, nImageHeight = 1000;
BYTE* pBuffer = new BYTE[nImageWidth*nImageHeight];
vtkNew<vtkImageImport> imageImport;
imageImport->SetDataSpacing(1, 1, 1);
imageImport->SetDataOrigin(0, 0, 0);
imageImport->SetWholeExtent(0, pImage->GetFrameWidth() - 1, 0, pImage->GetFrameHeight() - 1, 0, 0);
imageImport->SetDataExtentToWholeExtent();
imageImport->SetNumberOfScalarComponents(1);
imageImport->SetDataScalarTypeToUnsignedChar();
imageImport->SetImportVoidPointer(pBuffer);
imageImport->Update();
// Here i need to convert to height map.
// but, i have no idea..
Please advise on solution.
Thank you in advance.
