[vtkusers] Bug with vtkPropPicker and overlapping renderers

[Jothybasu Selvaraj]

Try adding

renWin->SetNumberOflayers(2)

before adding renderers to renWin.


Jothy

On Mon, Apr 30, 2012 at 5:06 PM, Simon Drouin <drouin.simon at gmail.com>wrote:

> Trying to get the pick position from the first of 2 overlapping renderers
> doesn't work. Here is an example:
>
> vtkRenderer * ren0 = vtkRenderer::New();
> ren0->SetLayer( 0 );
> vtkRenderer * ren1 = vtkRenderer::New();
> ren1->SetLayer( 1 );
>
> vtkRenderWindow * win = vtkRenderWindow::New();
> win->AddRenderer( ren0 );
> win->AddRenderer( ren1 );
>
> ......
>
> vtkPropPicker * picker = vtkPropPicker::New();
> picker->Pick( x, y, z, ren0 );
> double pos[3];
> picker->GetPickPosition( pos );
>
> Here, pos will be wrong. The reason seems to be that GetPickPosition()
> relies on the content of the z buffer, but the z buffer generated by the
> first renderer is being cleared when the second renderer gets rendered.
>
> Anybody has a workaround for that?
>
> s.
>
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-- 
Jothy
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