[vtkusers] Help with drawing lines

[Konstantinos Kelg]

Hi. I need to render some vectors in 3D space and I've decided to draw them as lines. However my code doesn't seem to work (I see nothing). Does anyone know why ?vtkCellArray *cellArrayNorm = vtkCellArray::New();
vtkPoints *points2 = vtkPoints::New();
points2->Allocate(2*m_NumOfVertices*3*sizeof(float));

for(int k=0; k<m_NumOfVertices; k++)
 	{
 		float* fp = VerticesP[k].coords; // Get vertex coords.
 		float* fpN = NormP[k].coords; // Get vertex normal.
 		points2->SetPoint(k, fp); // Set 1st point
 		points2->SetPoint(m_NumOfVertices + k, // Set 2nd point.
 			    fp[0]+fpN[0], // x+dx
     			fp[1]+fpN[1], // y+dy
     			fp[2]+fpN[2]);// z+dz
 		// Set up new (line) cell and insert.
 		int pts[2] = {k, m_NumOfVertices+k};
 		cellArrayNorm->InsertNextCell(2, pts);
 	}

 	vtkPolyData *polyDataNorm = vtkPolyData::New();
 	polyDataNorm->SetPoints(points2);
 	polyDataNorm->SetPolys(cellArrayNorm);

 	vtkPolyDataMapper *polyDataMapperNorm = vtkPolyDataMapper::New();
 	polyDataMapperNorm->SetInput(polyDataNorm);

 	ActorNorm->SetMapper(polyDataMapperNorm);
 	ren1->AddActor(ActorNorm);

 		vtkProperty *prop = vtkProperty::New();
 		prop->SetColor(1.0, 0.0, 0.0);
 	ActorNorm->SetProperty(prop);

 	points2->Delete();
 	cellArrayNorm->Delete();
 	polyDataNorm->Delete();
 	polyDataMapperNorm->Delete();
 	prop->Delete();

Thanks.


      
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