[vtkusers] Cell pick and Delete

[fanghao]

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ｗｈｅｎ　Ｉ　ｐｕｓｈ　ｄｏｗｎ　ｔｈｅ　ｒｉｇｈｔ　ｂｕｔｔｏｎ，ｔｈｅ　ｓｅｌｅｃｔｅｄ　ｃｅｌｌ　ｗｉｌｌ　ｂｅ　ｄｅｌｅｔｅｄ．　
　ｖｔｋＡｐｐｅｎｄＦｉｌｔｅｒ－＞ａｄｄＩｎｐｕｔ（ｓｅｌｅｃｔｅｄ）　　ａｎｄ　
ｖｔｋＡｐｐｅｎｄＦｉｌｔｅｒ－＞ｒｅｍｏｖｅＩｎｐｕｔ（ｓｅｌｅｃｔｅｄ）　　ｉｓ　ＯＫ。　ｂｕｔ　Ｉ　　ｈａｖｅ　ａ　ｔｒｏｕｂｌｅ　．
ｗｈｅｎ　Ｉ　　ｗａｎｔ　ｔｏ　ｄｅｌｅｔｅ　ｔｈｅ　ｌａｓｔ　ｏｎｅ，ｔｈｅ　ｅｒｒｏｒ　ｉｎｆｏｒｍａｔｉｏｎ　ｗｉｌｌ　ｃｏｍｅ　ｏｕｔ．


ERROR: In ..\..\VTK\Filtering\vtkDemandDrivenPipeline.cxx, line 727
vtkStreamingDemandDrivenPipeline (0256C690): Input port 0 of algorithm
vtkAppendFilter(025821B8) has 0 connections but is not optional.xfF

Ａ　ｐａｒｔ　ｏｆ　ｓｏｕｒｃｅ　ｃｏｄｅ：

vtkSmartPointer<vtkDataSetCollection> collection =
vtkSmartPointer<vtkDataSetCollection>::New();
			collection = appendFilter->GetInputList();
			int NumberOfItems = collection->GetNumberOfItems();
			std::cout<<"There are"<< NumberOfItems<<" Item In Collection"<<std::endl;
			vtkDataSet *selected = collection->GetItem(i);

			appendFilter->RemoveInput(selected);
			appendFilter->Update();
		
			//collection = appendFilter->GetInputList();
			//std::cout<<"After Remove,There are"<< collection->GetNumberOfItems()<<"
Item In Collection"<<std::endl;
			selectedMapper->SetInputConnection(appendFilter->GetOutputPort());
			selectedActor->SetMapper(selectedMapper);
			selectedActor->GetProperty()->SetColor(1,0,0);
		
this->Interactor->GetRenderWindow()->GetRenderers()->GetFirstRenderer()->AddActor(selectedActor);
			
http://vtk.1045678.n5.nabble.com/file/n5539990/QQ%E6%88%AA%E5%9B%BE20120306135025.jpg 

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