[vtkusers] Need help integrating VTK with an existing OpenGL application (translating glFrustum and gluLookAt calls to VTK)

[Weiguang Guan]

Hi Mark,

If you decide to move on to vtk, then you shouldn't called gl commands 
directly. vtkCamera contains methods that implement what you want to do.

Weiguang

On Thu, 3 Jan 2008, Mark Waligora wrote:

> Hey all,
> I've done quite a bit of searching and reading and am having some trouble
> getting started integrating VTK into my application.  I'm a new user, but
> I've spent enough time looking that I don't think I'm missing anything too
> obvious.
>
> I have a fairly simple visualization application written with OpenGL.  I
> want to visualize some more complicated data sets, so I wanted to write a
> version that works with VTK.
>
> My visualization application is fed in data from a motion capture system, so
> right now, every time my application loop updates, it reads the data from
> the mo-cap system, and updates the rendering with very specific calls to
> glFrustum and gluLookAt.  The front face of the frustum volume is almost
> never centered around the z axis, so I can't simulate the frustum creation
> by simply providing a vtkCamera with a position, direction, and viewing
> angle.  I need more control of the frustum shape than that functionality
> seems to provide.
>
> Can anyone advise me on how to create a simple vtk application with no user
> control where the frustum and camera position are automatically updated by
> the program every cycle of the main program loop?  From what I can tell, I
> don't want to use an interactor since the user will not be interacting with
> the application (the user interacts with the motion capture system, and the
> application simply queries data from the motion capture system when it is
> rendering).  Again, I need to be able to create frustums that aren't
> centered around the z axis.
>
> Thanks in advance!
>
> -Mark Waligora
>