[vtkusers] Symmetry questions

[Banksie]

Hi again,

I'm a lot closer than I was, but I'm getting something a bit strange. When I
apply symmetry to one axis, everything works fine, but when I move to having
two axes with symmetry, I get a Seg Fault when it comes to the 

pRenderer->GetRenderWindow->Render();

Command at the end of the code. I've attached the code below. Am I doing
something silly?

Thanks again
Robbie

void SnapshotView::slotSymmetry(const bool & flip, const int & axis)
{
	// Determine which axes are flipped
	if(axis==xAxis) xFlipped=flip;
	if(axis==yAxis) yFlipped=flip;
	if(axis==zAxis) zFlipped=flip;

	// Add a vtkTranform to apply symmetry to the dataset
	vtkTransform * pTranslationX = vtkTransform::New();
	vtkTransform * pTranslationY = vtkTransform::New();
	vtkTransform * pTranslationZ = vtkTransform::New();

	// Add a new vtkPolyDataMapper to deal with the new symmetrical data 
	vtkPolyDataMapper * pMapperSymm = vtkPolyDataMapper::New();
	// Add a new vtkPolyData to deal with the new symmetrical data 
	vtkPolyData * pNewData = vtkPolyData::New();
	// Add a new vtkAppendData to deal with the new symmetrical data 
	vtkAppendPolyData * pAppendData = vtkAppendPolyData::New();

	// Create translation to data for given symmetry
	pTranslationX->Translate(1.0, 0.0, 0.0);
	pTranslationY->Translate(0.0, 1.0, 0.0);
	pTranslationZ->Translate(0.0, 0.0, 1.0);
	
	// Add the source data	pAppendData->AddInput(source->GetOutput()); to our
new vtkAppendData
	pAppendData->AddInput(source->GetOutput());
	vtkPolyData * pNewSourceData = source->GetOutput();

	if(xFlipped){
		// Apply translation filter to data for given symmetry
		vtkTransformPolyDataFilter * pTransformFilter1 =
vtkTransformPolyDataFilter::New();
		pTransformFilter1->SetInput(pNewSourceData);
		pTransformFilter1->SetTransform(pTranslationX);
		pTransformFilter1->Update();

		// Create a vtkPolyData set and add it to the vtkAppendPolyData for the
symmetrical data
		vtkPolyData * pData1 = pTransformFilter1->GetOutput();
		pAppendData->AddInput(pData1);
	}

	if(yFlipped){
		// Apply translation filter to data for given symmetry
		vtkPolyData * pTempData = pAppendData->GetOutput();
		vtkTransformPolyDataFilter * pTransformFilter2 =
vtkTransformPolyDataFilter::New();
		pTransformFilter2->SetInput(pTempData);
		pTransformFilter2->SetTransform(pTranslationY);
		pTransformFilter2->Update();

		// Create a vtkPolyData set and add it to the vtkAppendPolyData for the
symmetrical data
		vtkPolyData * pData1 = pTransformFilter2->GetOutput();
		pAppendData->AddInput(pData1);
	}


	if(zFlipped){
		// Apply translation filter to data for given symmetry
		vtkPolyData * pTempData2 = pAppendData->GetOutput();
		vtkTransformPolyDataFilter * pTransformFilter3 =
vtkTransformPolyDataFilter::New();
		pTransformFilter3->SetInput(pTempData2);
		pTransformFilter3->SetTransform(pTranslationZ);
		pTransformFilter3->Update();

		// Create a vtkPolyData set and add it to the vtkAppendPolyData for the
symmetrical data
		vtkPolyData * pData1 = pTransformFilter3->GetOutput();
		pAppendData->AddInput(pData1);
	}

//	// Finally copy all the appended data to a new vtkPolyData set
	pNewSourceData = pAppendData->GetOutput();

	// Remap the data for display
	pMapperSymm->SetInput(pNewSourceData);

	// Add Mapper to Actor
	pActor->SetMapper(pMapperSymm);

	// Add Actor to renderer
	pRenderer->AddActor(pActor);

	// Reset camera
	pRenderer->ResetCamera();
	pRenderer->GetRenderWindow()->Render();

	pTranslationX->Delete();
	pTranslationY->Delete();
	pTranslationZ->Delete();
	pAppendData->Delete();
	pNewData->Delete();
	pNewSourceData->Delete();
}


David Doria-2 wrote:
> 
> Robbie,
> 
> You can use vtkAppendPolyData (
> http://www.vtk.org/Wiki/VTK/Examples/CombinePolydata) to combine the data
> sets, then use only one mapper and one actor.
> 
> Give it a try and let us know if it works out.
> 
> Thanks,
> 
> David
> 

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