[vtkusers] Bug with vtkPropPicker and overlapping renderers

[Simon Drouin]

Was doing it already in my real code (forgot it in the example).

s.

On Mon, Apr 30, 2012 at 12:12 PM, Jothybasu Selvaraj <jothybasu at gmail.com>wrote:

> 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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