[Insight-users] which positions, the value of them is zero(black) in this bounding box of the actor,

[yas ---]

Hi

I can get bounds of an actor to know that  it is located in a range of
situations in renderwindow. Course is a object like cube,

But if the object is irregular organ then draw a bounding box around the
object, it would be a black background (assuming the object is white)  in
some situations.

In fact I want to  know which positions,  the value of them is zero(black)
in this bounding box of  the actor,
(like the some voxel of it is zero )

now Do I use from what command in vtk?

thanks alot
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