[vtkusers] Problems with vtkPropPicker + OpenGL2

[marcin.krotkiewski]

Hello,

I am experiencing problems with vtkPropPicker when using OpenGL2 backend 
(Java bindings). I have attached a screenshot of an example setup with 
two surfaces. vtkPropPicker very often returns a wrong prop - red dots 
on the surfaces mark approximate places, where the reading returned the 
other surface, not the expeced one. As you see, this happens all over 
the place, both on the top and bottom surface.

Those problems do not occur when using vtkPropPicker with the old OpenGL 
backend. There is also no such issues when using vtkCellPicker and OpenGL2.

Do you know of any problems with Picking + OpenGL2 that could be the 
reason for such behavior? If not, I would be happy to provide more 
information to find the cause of this problem

Regards,

Marcin
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