remeshsurf - mesh density

[wagner.rupp]

Dear all,

I am trying to downsample one interior surface of my model to achieve more time-efficient simulations, using remeshsurf for this process. While the downsample is done, some regions still have very high node density. Is  there a way to control this node density ? if so, how to aquire a more evenly distributed position of the nodes?

Regards,

Wagner

[Qianqian Fang]

On 01/26/2015 06:00 AM, wagner.rupp wrote:

Dear all,

I am trying to downsample one interior surface of my model to achieve more time-efficient simulations, using remeshsurf for this process. While the downsample is done, some regions still have very high node density. Is  there a way to control this node density ? if so, how to aquire a more evenly distributed position of the nodes?

hi Wagner

can you try meshresample() instead of remeshsurf?

the meshresample approach will first remove nodes in
the dense clusters, resulting in a more uniform surface.
The only downside is that it may produce self-intersecting
elements while remeshsurf won't. However, if your surface
is a single closed surface, self-intersecting elements can
be removed by using meshcheckrepair(...,'meshfix').

The dense clusters of nodes appear to be related to the
CGAL surface extraction algorithm and it's handling of
non-manifold structures. The CGAL team is aware of this
issue. I am CCing Andreas Fabri with this email, who is the
project lead of the CGAL team.

Qianqian

Regards,

Wagner

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[wagner.rupp]

Hello Qianqian,

Thank you for you quick reply. I have tried using meshresample(), but as you pointed,I had some issue with self-intersecting elements, where the 'meshfix' option might not apply due to  a disconnected region (not a single closed surface). I will try isolating those regions, resample them separately and merging afterwards to see if I can better results.

Thank you,

Wagner

[Qianqian Fang]

On 1/27/2015 4:37 AM, wagner.rupp wrote:

Hello Qianqian,

Thank you for you quick reply. I have tried using meshresample(), but as you pointed,I had some issue with self-intersecting elements, where the 'meshfix' option might not apply due to  a disconnected region (not a single closed surface). I will try isolating those regions, resample them separately and merging afterwards to see if I can better results.

hi Wagner

if the surface is made of disconnected components, what you said
is exactly what I would do. you can run meshresample first, then
use finddisconnsurf() to return each component, apply meshcheckrepair
to each component, then mergemesh() to all, and apply removedupnodes()
to remove the duplicated nodes.

or for each component, you may run removeisolatednode before
feeding to meshcheckrepair. this will keep only the nodes in each
component. After mergemesh, you no longer need removedupnode.

Qianqian

Thank you,

Wagner

On Monday, January 26, 2015 at 12:00:08 PM UTC+1, wagner.rupp wrote:

Dear all,

I am trying to downsample one interior surface of my model to achieve more time-efficient simulations, using remeshsurf for this process. While the downsample is done, some regions still have very high node density. Is  there a way to control this node density ? if so, how to aquire a more evenly distributed position of the nodes?

Regards,

Wagner

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[wagner.rupp]

Hi Qianqian

 Just a quick feedback: those functions were really useful! The problem of high node density is gone and while the geometry is well preserved. 

One thing I noticed is that the 'meshfix' option in meshcheckrepair() was removing some elements that it shouldn't, using the option 'intersect' this error didn't occur.

Once again, thank you for your help

Wagner

  

On Monday, January 26, 2015 at 12:00:08 PM UTC+1, wagner.rupp wrote:

[Qianqian Fang]

On 01/29/2015 03:23 AM, wagner.rupp wrote:

Hi Qianqian

 Just a quick feedback: those functions were really useful! The problem of high node density is gone and while the geometry is well preserved. 

One thing I noticed is that the 'meshfix' option in meshcheckrepair() was removing some elements that it shouldn't, using the option 'intersect' this error didn't occur.

what error message did you see when this happened? did you
see any problem in the output mesh when you used "meshfix"?

actually, the 'intersect' option does not do anything to the mesh,
it only tests for self-intersections, but won't fix them.

Qianqian

Once again, thank you for your help

Wagner

  

On Monday, January 26, 2015 at 12:00:08 PM UTC+1, wagner.rupp wrote:

Dear all,

I am trying to downsample one interior surface of my model to achieve more time-efficient simulations, using remeshsurf for this process. While the downsample is done, some regions still have very high node density. Is  there a way to control this node density ? if so, how to aquire a more evenly distributed position of the nodes?

Regards,

Wagner

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