[Paraview] paraview3beta: isosurface coloring and transparency

[Berk Geveci]

Ouch! That is some seriously complicated geometry! I think you are
running into the limitations of the depth-peeling algorithm that is
used to render transparent geometry. You can try to increase some of
these limits by recompiling ParaView. In the source code, you have to
edit VTK/Rendering/vtkRenderer.cxx and change MaximumNumberOfPeels on
line 119 to something higher, maybe 10-20. However, this will reduce
rendering speed because each peel roughly corresponds to 1 render.

-berk

On 5/8/07, W. Bryan Smith <wbsmith at gmail.com> wrote:
> On 5/7/07, W. Bryan Smith <bryan at ncmir.ucsd.edu> wrote:
>
> >
> >
> > > > i've also found that when some transparency is set, the integrity
> > > > of the isosurface is poor... that is, there are some raster lines in
> > > > and other artifacts in the surface.  anyone experienced the same
> > > > on their build of paraview3?  i am running on linux64 (suse 10.0 )
> > > > with the latest build of the drivers for my graphics card.  i have
> > > > composite rendering turned off, and am running in server/client
> > > > mode on a single (4-process) machine.
> > >
> > > A screenshot would be helpful in tracing this.
> >
> >
> > ok, will do tomorrow when at the work machine where this happens.
> > basically, the image is corrupted in the sense that there are lines and
> > other artifacts that make it look like the transparency has not been
> > appropriately assigned to all faces of the mesh.  might be an mpi or
> > graphics card issue if this has not been seen by other users...
>
>
> screenshots are available at
> http://ncmirucsd.edu/~bryan/pv3ScreenShots
>
> the file pv3ScreenShot00.jpg shows the surface with opacity = 1, and file
> pv3ScreenShot01.jpg shows the surface with opacity = 0.4.  i am able to
> render this same surface with the same alpha values without any such
> artifacts using paraview2.6, and some other vtk-based software packages
> (such as slicer3, scirun, etc).  i am not sure if it matters, but the
> initial file
> loaded is a legacy vtk format.
>
> thanks,
> bryan


-- 
 Berk Geveci
 Kitware Inc.
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