[vtkusers] Color of isosurface

[Jothy]

Can you try contourMapper->setScalarVisibilityOff()

Jothy

On 02-Jul-2012, at 5:52 PM, "Dale \"Luke\" Peterson" <hazelnusse at gmail.com> wrote:

> I subclassed vtkImplicit function and implemented EvaluateFunction()
> and EvaluateGradient().  I then use vtkSampleFunction,
> vtkContourFilter, vtkPolyDataMapper, and vtkActor and add the actor to
> a renderer.  I am only interested in one iso-surface, the zero
> iso-surface, and in the past it always displayed in red.  Something
> changed (likely in my code) but I can't figure out what, and the the
> surface renders only in black.  I have tried calling
> GetProperty()->SetColor() on the actor but this has no effect.  I also
> tried dropping in example code for the vtkSphereSource which shows up
> blue, as in the tutorial.  Based on this, I'm guessing that there is
> something going on with vtkSampleFunction, vtkContourFilter, or
> vtkPolyDataMapper, but I can't figure out what.
> 
> I am doing all of this in my own subclassed QVTKWidget, and the color
> used to work fine.  I also have a minimal example of the surface that
> doesn't use QVTKWidget and it shows the surface in red.  Perhaps there
> is something strange going on in Qt?
> 
> Any ideas on what might be going on?
> 
> The relevant code I have in the constructor of my QVTKWidget subclass is:
> 
>  configurationSurface = vtkSmartPointer<vtkHolonomicConstraint>::New();
>  sample = vtkSmartPointer<vtkSampleFunction>::New();
>  sample->SetSampleDimensions(50, 50, 50);
>  sample->SetImplicitFunction(configurationSurface);
>  // Create the 0 isosurface
>  contour = vtkSmartPointer<vtkContourFilter>::New();
>  contour->SetInputConnection(sample->GetOutputPort());
>  contour->GenerateValues(1, 0.0, 0.0);
>  contour->Update();
> 
>  // Map the contours to graphical primitives
>  contourMapper = vtkSmartPointer<vtkPolyDataMapper>::New();
>  contourMapper->SetInputConnection(contour->GetOutputPort());
> 
>  // Create an actor for the contours
>  contourActor = vtkActor::New();
>  contourActor->SetMapper(contourMapper);
> 
>  // Has no effect: still shows up as black.
>  contourActor->GetProperty()->SetColor(0,0,1);
> 
> Thanks,
> Luke
> 
> 
> -- 
> “People call me a perfectionist, but I'm not. I'm a rightist. I do
> something until it's right, and then I move on to the next thing.”
> ― James Cameron
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