[vtkusers] Picking not working - or very strangely

[Malcolm Drummond]

Hi Paul

I see there's a method 'SetEventInformationFlipY' which already takes care
of the problem I described. I don't know my way around these sample apps.
Try finding some sort of pattern to the behaviour - is it just the vertical
value that's out or is it both coords etc. - and then repost your problem
with more info.

Malcolm

----- Original Message -----
From: "Paul Tait" <paul at opes.com.au>
To: "Malcolm Drummond" <malcolm at geovision.co.za>
Sent: Monday, February 10, 2003 3:07 AM
Subject: Re: [vtkusers] Picking not working - or very strangely


> Hi Malcolm
>
> Thanks for the reply. You're obviously alot further down the road on VTK
> than I am. Even having the x,y screen coordinates I've no idea how to
> convert them into the x/y/z of possible objects in the scene.
>
> Any other hints or some basic code would be appreciated.
>
> Thanks Paul
>
> ----- Original Message -----
> From: "Malcolm Drummond" <malcolm at geovision.co.za>
> To: "Paul Tait" <paul at opes.com.au>
> Sent: Friday, February 07, 2003 5:08 PM
> Subject: Re: [vtkusers] Picking not working - or very strangely
>
>
> > Hi Paul
> >
> > There might be a problem between coordinate systems (Windows vs
logical).
> > I've always handled the pick manually, subtracting the y value from the
> > window height, so coords are from the bottom of the window and not the
> top.
> >
> > Hope this helps
> > Malcolm
> >
> > ----- Original Message -----
> > From: "Paul Tait" <paul at opes.com.au>
> > To: <vtkusers at public.kitware.com>
> > Sent: Friday, February 07, 2003 10:37 AM
> > Subject: [vtkusers] Picking not working - or very strangely
> >
> >
> > > Hi
> > >
> > > I'm trying to get picking to work in an MFC/VTK app. I've used VTK to
> > > visualise to geological data. Basically the top and bottoms of the
> > > underground reservoirs are seperate actors made up of vtkCellArrays of
> > > triangles and oil wells are  vtkCellArrays of lines. When press 'p'
over
> a
> > > reservoir or well nothing happens but when I press 'p' else where in
the
> > > screen sometimes one of my reservoirs gets picked and the bounding box
> > > appears. It almost seems as if the ray is being projected from
somewhere
> > in
> > > the top of the scene so I have to guess where to place my mouse.
> Obviously
> > > something is very wrong but I just can't see it. My app is based on
the
> > mfc
> > > app in the examples.
> > >
> > > Also I think I would like to use a vtkPropPicker but don't know if my
> > Matrox
> > > G400 will support it under W2K ?
> > >
> > > TIA Paul Tait
> > >
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