[vtkusers] Get an vtkImplicitBoolean object from vtkActors

[Zhu Yong]

Hi VTKers,

I have some actors in render window, now I want to get the implicit 
functions wich define those actors and then take UNION operation of all 
those implicit functions. Then use EvaluateFunction(float x[3]) method to 
evaluate function value at some points.
I have tried two ways: use vtkImplicitVolume and vtkImplicitDataSet, but 
seems neither works. The function value are the same for different points.

anyone can help me?

=====================
use vtkImplicitVolume
============

vtkImplicitBoolean * boolean = vtkImplicitBoolean::New();
boolean->SetOperationTypeToUnion();

vtkImplicitVolume * vol1 = vtkImplicitVolume::New();
vol1->SetVolume((vtkImageData*)actor1->GetMapper()->GetInput());
vtkImplicitVolume * vol2 = vtkImplicitVolume::New();
vol2->SetVolume((vtkImageData*)actor2->GetMapper()->GetInput());

boolean->AddFunction(vol1);
boolean->AddFunction(vol2);

=====================
use vtkImplicitDataSet
============

vtkImplicitBoolean * boolean = vtkImplicitBoolean::New();
boolean->SetOperationTypeToUnion();

vtkImplicitDataSet * data1 = vtkImplicitDataSet::New();
data1->SetDataSet(actor1->GetMapper()->GetInput());
vtkImplicitDataSet * data2 = vtkImplicitDataSet::New();
data2->SetDataSet(actor2->GetMapper()->GetInput());

boolean->AddFunction(data1);
boolean->AddFunction(data2);

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