[Paraview] How to stop ParaView from triangulating imported cells

[Pieter Barendrecht]

Hi Kyle,

Thanks for your reply. I just compiled ParaView version 4+ from source (64-bit Linux machine), the problem is unfortunately still there. Could you try opening the simple geometry I attached to my first message (18 Jul 2013)?

If it is indeed not yet possible to display the original cells instead of these wretched triangles, I propose to add a checkbox to either the View Settings Dialog or the View Panel, which enables/disables the display of (the outline of) the original cells.

Best,
Pieter


On Wed, 24 Jul 2013 15:06:54 -0400
"Gamble, Kyle" <gamblek at aecl.ca> wrote:

> UNRESTRICTED | ILLIMITÉ
> 
> Hello Pieter,
> 
> I had similar issues with ParaView triangulating my imported cells when I was using 2nd Order Quads (quad8 with midside nodes).  What version of ParaView are you using? I had this issue in Paraview 3.14.  When I upgraded to 3.98 or 4.01 when I used the 'Surface with Edges' display mode, the mesh was just of the quads.  I am relatively new to ParaView but I try to help when I've had similar issues in the short time I have been using it. 
> 
> Best Regards,
> 
> Kyle
> 
> -----Original Message-----
> From: paraview-bounces at paraview.org [mailto:paraview-bounces at paraview.org] On Behalf Of Pieter Barendrecht
> Sent: July 24, 2013 1:47 PM
> To: paraview at paraview.org
> Subject: Re: [Paraview] How to stop ParaView from triangulating imported cells
> 
> In addition, I'd like to stress that the 'Surface with Edges' display mode is the one I use most often. Displaying the actual cells (i.e. the quadrilaterals) in this mode would be really useful!
> 
> Best,
> Pieter
> 
> On Thu, 18 Jul 2013 19:17:36 +0200 
> Pieter Barendrecht <p.j.barendrecht at student.tue.nl> wrote:
> 
> > Hi,
> > 
> > I'm wondering how to prevent ParaView from (visually) triangulating the imported cells. To illustrate the problem, I attached a minimal example (2.3 kB) to this email. It contains a heavily discretized version of a parametric surface, consisting of 20 cells (quads). 
> > 
> > These quads are in fact non-planar, so I understand why ParaView triangulates them for plotting purposes. However, when I export the scene as an .x3d file, it actually exports the triangles instead of the quads.
> > 
> > Two questions:
> > - Is it possible to display the edges of the actual cells (i.e. the quads) in ParaView (i.e. in 'WireFrame' mode or in 'Surface with Edges' mode)
> > - Is it possible to export the actual cells instead of these triangles
> > 
> > Best regards,
> > Pieter
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