[vtkusers] Y coordinate convert error in display to World coord

[Michael Liu]

Hi, all
I've been struggled with the problem for quite a while, still can't find
any clue for solve it.  :.(
I have a unstructred grid displayed in 3D
The issue is that a display coordinate point(x,y, 0) transfered to world
coordinate incorrectly. The wield thing is that while x coordinate is
converted properly, while Y coordinate is not.

Following is part of function code.

VTK_DECLARE(vtkRenderer, ren);
ren = GetRenderer();

//clicked point in pos
ren->SetDisplayPoint(pos.x(), pos.y(), 0.0);
qDebug()<<"Display:"<<pos.x()<<" "<<pos.y()<<" 0.0";

ren->DisplayToWorld();
double pt[4];
ren->GetWorldPoint(pt);

qDebug()<<"World:"<<pt[0]<<" "<<pt[1]<<" "<<pt[2]<<" "<<pt[3];


I am using QVTKWidget, and display coordinate origin is on the top-left of
the QVTKWidget.

If any valueable info on this issue is provided, I would greatly appreciate


Thanks,
feng
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