Complaint -> vtk3.1 NR vtkCamera: If it ain't broke, then please don't fix it.

[Audrius Stundzia]

Hi David,

Thanks for your prompt reply.

After reading your e-mail, I realized what I need to do is to
explicitly set the camera Position and FocalPoint. Having done
that, automatic calculation of the ViewPlaneNormal makes sense
and more importantly, works.

Also, thanks for the pointer to the recent vtk documentation.
It would be nice if it was downloadable for those times that
network access is down.

Regards,

Audrius


>From: David Gobbi <dgobbi at irus.rri.on.ca>
>To: audrius at adv-biologic.com
>CC: vtkusers at public.kitware.com
>Subject: Re: Complaint -> vtk3.1 NR vtkCamera: If it ain't broke, then 
>please don't fix it.
>Date: Tue, 16 May 2000 15:10:25 -0400 (EDT)
>
>Hi Andrius,
>
>I was the one who added the automatic calculation of the VPN,
>and I checked with folks at GE and Kitware before making the
>change.
>
>In my opinion, the previous vtkCamera _was_ broken, because
>99% of the users out there do _not_ need to set the
>VPN themselves and shouldn't have to.  Even some of the VTK
>examples were setting the VPN incorrectly.  So, now
>the VPN is automatically calculated to be the
>FocalPoint->Position vector.
>
>If you need to set a VPN which is different from the
>FocalPoint->Position vector, you can do that using the
>SetObliqueAngles() method.  If you need something
>different, _clearly explain what you need_ and maybe
>I or someone else can do something about it.
>
>The most recent docs are always available at
>http://public.kitware.com/vtk/quality/Doc/atoz.html
>I don't believe they are available in downloadable
>form.
>
>  - David
>
>On Tue, 16 May 2000, Audrius Stundzia wrote:
>
> > Hi vtker's
> >
> > After updating the vtk nightly release from 15.Feb.2000 to
> > 15.May.2000, the following warning now appears when I run my
> > code
> >
> > Warning: In vtkCamera.cxx, line 772
> > vtkOpenGLCamera (0xf8c270): SetViewPlaneNormal:  This method is 
>deprecated
> > the view plane normal is calculated automatically.
> >
> > Thanks to the vtkCrew for taking the trouble to automatically
> > calculate the view plane normal for me. However, the view
> > plane normal calculated is NOT the one I want. I'd like to suggest
> > a "if it ain't broke, then don't fix it" approach to vtk
> > "improvements". Sure, calculate the view plane normal, for example,
> > if you feel a compelling need to do so, but leave the option of 
>disagreeing
> > with you and setting it ourselves. This general flexability is (was ?) 
>one
> > of the attractive aspects of vtk.
> >
> > Unfortunately, there does not appear a new downloadable
> > release of the vtk Man Pages html that documents these changes.
> >
> > How do I effectively get around this new feature? Any (time-saving)
> > insight would be most appreciated.
> >
> > Despite these annoyances, I'm still a big fan.
> >
> > Regards,
> >
> > Audrius
>

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