[vtkusers] Dilemma

[John Platt]

Jim,

You can try using vtkExtractEdges. This gives the original outline and
not the triangulation of the nonlinear cells (unlike vtkGeometryFilter
and the wireframe actor property) and therefore quadratic elements are
displayed as required.

You will find that the internal triangulation of the quadratic cells has
certain side effects.

John.

-----Original Message-----
From: vtkusers-admin at vtk.org [mailto:vtkusers-admin at vtk.org] On Behalf
Of Mathieu Malaterre
Sent: 15 March 2004 15:08
To: j.robinson at kepler-systems.com
Cc: vtkusers
Subject: Re: [vtkusers] Dilemma

Jim,

	[vtkusers list is now: vtkusers at vtk.org]

	I am not sure I understand your problem. Is it possible you send
me/the 
list a python/cxx/tcl script with a small dataset to reproduce the
problem ?

	If your data is confidential, could you at least send a
screenshot ? 
That would help a lot. In that case indicate the pipeline you are using.

Thanks,
Mathieu

James C. Robinson wrote:
> Dear All,
> 
> My transition from 4.0 to 4.2 is not going entirely smoothly. I have
managed
> to get the quad hexes to work (as in it doesn't crash) - thanks to all
> (John, David & Mathieu). The issue was the access violation that was
> corrected by John in one of the revisions. However, I am managing to
get a
> 3D view now, but the behaviour is not what I had hoped. The wireframe
view,
> which should show the outer edges of the quad hexes now shows what
appear to
> be tets (this is a little like the problem I have with the vtkCutter
that
> shows the cut element edges as triangle). This may be an issue with
> compiling a later revision of the appropriate object (vtkFeatureEdges)
or it
> could be more complicated than that. (NB: I would still like to hear
from
> any generous soul who has implemented a filter to create the correct
edges
> of a cut quad hex - or hex for that matter).
> 
> So, the ultimate dilemma is - what version of VTK should I use? Where
on the
> site does it state the current state of play eg:
> V4.0 Date last revision - known bugs Status (no longer maintained)
> V4.2 Date last revision - Official Release - known bugs Status
(finished
> development - maintained)
> V4.4 Date last revision - Interim Release known bugs Status (In
> development - maintained)
> V4.6 Date last revision - Not Released (est. date) known bugs Status
(In
> development - maintained)
> What is v4.5 and where does one get the source (if one wants it)?
> The page "Get the software" doesn't give all of this.
> 
> I am probably continuing to display my ignorance in regard the whole
> approach/objective, but it does start to get a little messy and
confusing
> (when all one wants is a library that does a,b,c).
> 
> Thanks for your continued patience and interest.
> 
> Jim
> 
> ______________________
> 
> James C. Robinson, PhD,
> Chartered Engineer,
> Kepler Simulation Systems Ltd.,
> 42 Rivergrove,
> Glanmire, Co. Cork,
> Eire
> 
> Tel:         +353-21-4822028
> Tel:         +353-87-2393010
> Fax:        +353-21-4822028
> E-mail:     j.robinson at kepler-systems.com
> ______________________
> 
> 
> 
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