[vtkusers] Rapid access to scalar data in vtkImageData

[Jothy]

Hi all,

I need to access the scalar values in a vtkImageData at a huge list of
(random) points.

Currentlt I ma using imgData->GetScalarComponentAsDouble(x,y,z,0).

But it is slow. This is the key step in the function I will be using. Is
there any other way to access it rapidly, may be with the pointer to scalar
values?

I need to copy the values to a std::vector.

Any suggestions?

Thanks

Jothy
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