[vtkusers] Augmented Reality Z-Buffer Question

[David E DeMarle]

You could render the real object into the back buffer using
vtkRenderWindow::SwapOff(), then vtkRenderWindow::GetZBufferData() to get
the depth, then turn Swap back on and SetZBuffer before rendering the
polyline.

If that is too slow, you could probably write a new vtkPainter that draws
only into the Z buffer and give that to the real object's
vtkPainterPolyDataMapper to get the same effect in one pass.

David E DeMarle
Kitware, Inc.
R&D Engineer
21 Corporate Drive
Clifton Park, NY 12065-8662
Phone: 518-881-4909


On Thu, Jan 19, 2012 at 8:20 AM, <s_goertl at ira.uka.de> wrote:

> Hello,
>
> I'm trying to achieve an augemented reality effect with VTK, but the
> hidden line/surface removal gives me some headache.
>
> I have a virtual representation of a real object and a polyline which is
> supposed to be displayed as part of the augemented reality. How would I
> setup VTK to not render the polyline when it would be invisible (occluded)
> by the real object?
>
> Is there a way to add the representation of the real object to the depth
> buffer, even though its opacity is actually set to 0? Are there other
> solutions to this problem?
>
> Thank you very much!
>
> Jochen
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