Nightly : BackFace/Frontface bug ?

[Ron Inbar]

OpenGL culls polygons in all three modes: GL_FILL, GL_LINE and GL_POINT.  If
VTK renders wireframes using glPolygonMode(GL_FRONT_AND_BACK, GL_LINE), face
culling should work.  In this case there must be some VTK code that disables
face culling in wireframe mode.  Or perhaps VTK renders wireframes as a
bunch of lines rather than polygons.  This, however, doesn't seem to make
much sense when using OpenGL.

Ron

----- Original Message -----
From: Bill Lorensen <wlorens1 at nycap.rr.com>
To: John Biddiscombe <j.biddiscombe at rl.ac.uk>; <vtkusers at gsao.med.ge.com>
Sent: Friday, October 08, 1999 04:12
Subject: Re: Nightly : BackFace/Frontface bug ?


> John,
>          I think its an OpenGL thing, unless someone out there knows how
to do it.
> Bill
>
> At 01:36 AM 10/8/99 +0100, John Biddiscombe wrote:
> >Dear vtk'ers
> >
> >Nightly release
> >
> >When an actor has rendering = surface, backface and frontface culling
work
> >as expected. When rendering = wireframe, no culling occurs (either front
or
> >back).
> >
> >Not sure if this is a bug or an OpenGL "feature", but I don't see why
> >culling shouldn't work in wireframe mode.
> >
> >This bug has not appeared overnight, but I wasn't sure about it
before....
> >
> >John B
> >(apologies if this isn't a bug).
>
>
>
>
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