[vtkusers] VTK6.3.0 and ghost levels

Berk Geveci berk.geveci at kitware.com
Mon Sep 14 10:46:23 EDT 2015

Hi Andreas,

There are still multiple levels of ghost cells. The difference is that they
are no longer marked by their level. Rather, we are using that unsigned
char / cell to encode other information (as a bit field). This works
because algorithms are no longer required to strip the ghost level they
requested. Rather, the removal now happens at the end of the pipeline. It
is still possible for consumers to request multiple ghost levels and for
sources to produce them. Note that the only sources that really support
this are the structured data sources and filters like D3.


On Mon, Sep 14, 2015 at 5:08 AM, Andreas Buykx <A.Buykx at tnodiana.com> wrote:

> Hi,
> I have read the kitware blog post about the change in handling of ghost
> levels in VTK6.3.0, and I understand that there are no longer multiple
> levels of ghost cells. However there is still the
> vtkStreamingDemandDrivenPipeline key UPDATE_NUMBER_OF_GHOST_LEVELS that is
> being updated throughout the pipeline. Could you please explain how this
> key is related to the new ghost-level behavior?
> Thanks a lot,
> Andreas Buykx
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