[vtkusers] vtk w/ CAVElib and clipping

[Tony Lavoie]

Pretty sure, since everything draws fine initially, and I can navigate
around the object, look up and down on it, but if I adjust its translation
on the polydatamapper up (I'm trying to get it into the center of the
physical CAVE space), it'll disappear. This is while it's running- I'll
click it up and up, and at a certain point, >poof< it's all gone. If I
click it down, it'll reappear though.

Thanks for the other links though, I'll check them out. But I'm just
trying to understand what's going on here, because I want to have this
code working. :)

-Tony

On Tue, 17 Jul 2001, John Shalf wrote:

> 
> Are you sure it isn't the CAVE-defined front/back clipping
> planes?
> 
> Have you looked at the other CAVE/vtk rendering engines like
> Paul Rajlich's Performer-based version
>   http://brighton.ncsa.uiuc.edu/%7Eprajlich/vtkActorToPF/
> Or if you need pure OpenGL (don't have Performer on your
> machine), then there's Matt Hall's
> vtkCaveRenderWindow/VTK2CAVE
>   http://zeus.ncsa.uiuc.edu/~mahall/
> 
> -john
> 
> Tony Lavoie wrote:
> > 
> > Hello all! I'm using vtk in a CAVE application. The CAVE library does its
> > own OpenGL calls to manage the camera view and stereo rendering, so I have
> > CAVE-based subclasses to RenderWindow and Renderer which avoid calling
> > those things which are handled by the CAVE lib- swapbuffer calls,
> > Camera::Render calls, etc. All of this works actually, though I've got an
> > interesting side-effect.
> > 
> > Whether I have the headsq dataset or a simple cone on display in the cave,
> > if I translate it vertically (set with PolyDataMapper::SetTranslation)
> > past a certain point, the object disappears, as if the display list gets
> > clipped. Printing the properties of the PolyDataMapper shows that no
> > clipping planes are defined, and no glEnables get called for clipping
> > planes (at least in PolyDataMapper). Maybe of some use, these
> > CAVE-based subclasses were initially written for vtk2.3; I brought them up
> > to be able to build against vtk3.2.
> > 
> > What else could be mangling things and causing this case of disappearing
> > graphical objects?
> > 
> > -Tony
> > 
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