[vtkusers] vtkBoxWidget::Points values change between Debug and Release mode

[Amélie Thery]

Hi everybody,
I am using vtkBoxWidget, and I use Points to control it size.
I defined a public function vtkPoints * GetPoints(){return Points;}to
access this protected member.
For example, when my vtkBoxWidget is defined by
{-1,0,0,
1,0,0,
1,0,1,
-1,0,1,

-1,1,0,
1,1,0,
1,1,1,
-1,1,1}

with one face under 0 and the opposite over 0 in x-axis,
I do:
vtkPoints* pts=GetPoints();
double a[3],b[3];
pts->GetPoint(0,a); //face under 0
pts->GetPoint(2,b); //face over 0

In debug mode, a[0]= -1  and b[0]= 1 as it is supposed to be,
In release mode, a[0]= 1 and b[0]= 1 so I can not check the size of the box.

I didn't change anything between both tests, if anyone has any idea it
would be grateful :)

Thank you for reading,
Amélie
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