[vtkusers] Strange behavior with colors

[Laurent]

Dear all,

I'm displaying some actors in my 3D scene most of all PolyData. I have a
problem setting the color of one of them. I first create the shape
(superquadric), display it after a transform, using a vtkProperty and the
method SetColor(1.0,0.0,0.0). It works.
Then, I just modify the transform matrix and the polydata appear in dark
grey. If I strongly zoom in, the shape seems very dark (something like
SetColor(0.1,0.1,0.1)) with a thin red highlight. Here is my code:

//Creation and display
	m_SuperQuadricGuide = vtkSuperquadricSource::New();
	m_SuperQuadricGuide->ToroidalOff();
	m_SuperQuadricGuide->SetPhiResolution(50);
	m_SuperQuadricGuide->SetPhiRoundness(0.50);
	m_SuperQuadricGuide->SetThetaResolution(50);
	m_SuperQuadricGuide->SetThetaRoundness(0.50);
	m_SuperQuadricGuide->SetSize(0.50);
	m_SuperQuadricGuide->SetScale(m_BoxWidget->GetXWidth()
,m_BoxWidget->GetYWidth(), m_BoxWidget->GetHeight());

	m_GuideShapeTransform = vtkTransform::New();
	m_GuideShapeTransform->SetMatrix(m_BoxWidget->GetHapticTransform());

	m_GuideShapeTransformFilter = vtkTransformPolyDataFilter::New();
	m_GuideShapeTransformFilter->SetTransform(m_GuideShapeTransform);
	m_GuideShapeTransformFilter->SetInput(m_SuperQuadricGuide->GetOutput());

	m_GuideMapper = vtkPolyDataMapper::New();
	m_GuideMapper->SetInput(m_GuideShapeTransformFilter->GetOutput());
	m_GuideMapper->ScalarVisibilityOff();

	m_GuideProperty = vtkProperty::New();
	m_GuideProperty->SetColor(1.0,0.0,0.0);
	m_GuideProperty->SetOpacity(0.7);

	m_GuideActor = vtkActor::New();
	m_GuideActor->SetMapper(m_GuideMapper);
	m_GuideActor->SetProperty(m_GuideProperty);


//in a second method, I modify the matrix
m_GuideShapeTransform->SetMatrix(m_BoxWidget->GetHapticTransform());	
m_SuperQuadricGuide->SetScale(m_BoxWidget->GetXWidth(),
m_BoxWidget->GetYWidth(), m_BoxWidget->GetHeight());

I tried several things such as FrontfaceCullingOn/Off BackfaceCullingOn/Off,
shadeOn/Off etc...
I have displayed the color values and everything is ok.
Is someone has an idea?
I can provide a screenshot if needed.

Thanks,
Laurent.


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