[vtk-developers] merge request for vtkCamera.cxx eyeseparation and near far planes correction (UNCLASSIFIED)

[David Cole]

A ha!

Thank you for the tidbit of information about EyeSeparation. So with a
value of 0.06, is it 6% of the x-axis (width) of the screen then?

I was coincidentally working with a physical system where coordinates
**are** specified in meters, and it, too used a default value of 0.06
for eye separation, so I ended up with a bad assumption in my head
because VTK's is not well documented, and since the numbers were the
same.....


Cheers,
David C.



On Thu, Mar 17, 2016 at 5:15 PM, David Gobbi <david.gobbi at gmail.com> wrote:
> Considering that vtkCamera doesn't know the physical size of the screen,
> I certainly hope that EyeSeparation is not in meters or any other absolute
> units!  It should be in units relative to the screen size.  And, since only
> the
> application itself knows the physical screen size, it is up to the
> application
> to set it appropriately.   The eye separation is much smaller relative to a
> huge wall screen, than to a workstation display.
>
> Just agreeing with the other David here...
>
>  - David
>
> On Thu, Mar 17, 2016 at 2:44 PM, David Cole via vtk-developers
> <vtk-developers at vtk.org> wrote:
>>
>> OffAxis projection in VTK is woefully underdocumented, and accepting
>> this pull request will only add to the mystery.
>>
>> I would suggest documenting that the coordinates used to specify it
>> are in vtkCamera coordinates (not world), and clarifying with comments
>> in the code what some of the constants used are for. Also,
>> EyeSeparation appears to be specified in meters, although it's unclear
>> how it relates to any of the VTK coordinate systems or to the size of
>> the actual display being used.
>>
>>
>> 2 cents,
>> David C.
>>
>>
>> On Thu, Mar 17, 2016 at 4:17 PM, Aashish Chaudhary
>> <aashish.chaudhary at kitware.com> wrote:
>> > Hi Joe,
>> >
>> > Thank for you for the PR. Could you please describe the problem in bit
>> > more
>> > detail?
>> >
>> > Thanks,
>> >
>> >
>> > On Thu, Mar 17, 2016 at 4:04 PM, Hennessey, Joseph G CTR USARMY RDECOM
>> > ARL
>> > (US) <joseph.g.hennessey2.ctr at mail.mil> wrote:
>> >>
>> >> CLASSIFICATION: UNCLASSIFIED
>> >>
>> >> Hello,
>> >>
>> >> I have modified
>> >>
>> >> Rendering/Core/vtkCamera.cxx:: ComputeOffAxisProjectionFrustum
>> >>
>> >> To fix a problem with eyeseparation and near and far planes for use
>> >> with
>> >> immersive paraview
>> >>
>> >> The merge request is called
>> >>
>> >> fix ComputeOffAxisProjectionFrustum eyeseparation and near and far
>> >> planes.
>> >>
>> >>
>> >>
>> >> https://gitlab.kitware.com/vtk/vtk/commit/4fe4fabb420bba77740ec988d060c5c296
>> >> d36afb
>> >>
>> >> Commit 4fe4fabb420bba77740ec988d060c5c296d36afb
>> >>
>> >> Authored by Joseph G. Hennessey about an hour ago
>> >> 1 parent d52198e1
>> >>
>> >> Please add this to VTK and indirectly to ParaView
>> >>
>> >> Thanks,
>> >>
>> >> Joe
>> >>
>> >> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> >> Joseph G. Hennessey Ph.D., Lockheed Martin
>> >> Army Research Lab
>> >> DOD Supercomputing Resource Center
>> >>
>> >>
>> >> CLASSIFICATION: UNCLASSIFIED
>> >>
>> >> _______________________________________________
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>> >>
>> >
>> >
>> >
>> > --
>> > | Aashish Chaudhary
>> > | Technical Leader
>> > | Kitware Inc.
>> > | http://www.kitware.com/company/team/chaudhary.html
>> >
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>