Post New Message


Name:arunvivekanand
Email
Institution:University at buffalo
Message:
Hello GUys

I have a doubt. Using iso2mesh i have created a 3d image of the brain sections. I want to import into abaqus so that i can mesh it finely. What are the steps to do that ?


Time:: Tue Nov 25 2014 17:11:39 GMT-0500 (Eastern Standard Time)</timestamp>

Name:Danila
Email
Institution:KIT
Message:
Hi,

the iso2mesh offers a wonderful environment to build tetrahedra meshes from volumetric voxel based grids. My question is: let's say I have a fine tetra mesh, which was generated from voxel based lattice. I'd like to have another, coarser tetra mesh, with the points/vertices given from the fine mesh. The process is as follows: I generate first the fine mesh, then select a set of uniformly distributed nodes from the fine mesh, and then with nodes I want to generate a new, "coarse" mesh. When I do it with Delaunay triangulation, I get also some regions/cavities meshed, which are actually (according to the lattice form) should be "free"

To sum up: given a mesh and original lattice, I'd like to have another coarser mesh with vertices being a subset of finer one.

Thanks in advance, Danila


Time:: Mon Oct 29 2012 14:06:06 GMT+0100 (CET)</timestamp>

Name:Qianqian Fang
Email
Institution:
Message:
hi Jacek

yes, it is a problem of octave. In fact, the 3D graphics support in octave is quite inefficient at this point. Octave has historically been using GNUPlot as its plotting backend. Unfortunately, GNUPlot's 3D plotting feature is very slow, and limited. Recently, more efficient graphical backends were added to octave. But it is not mature yet, it has only the basic features.

To enable the new graphics backend, you need to type

  backend('fltk');
once in octave's environment, or
  graphics_toolkit('fltk');
if you are using octave 3.5+

this will generate nicer surface plots from octave.

Qianqian


Time:: Wed Jan 18 2012 20:06:52 GMT-0500 (EST)</timestamp>

Name:jmaitan
Email
Institution:self
Message:
Sorry to post a trivial question in this forum but I could not find an active forum to resolve my installation problems.

I am running on Win7 using GUI Octave 1.5.4 + Octave 3.4.3. and have problem with handling graphics and accessing documentation.

To test the installation, I have run simple tests included in demo, for example, demo_grayscale_ex1. Octave completes the drawings but it is strictly a skeleton - just lines connecting nodes - no surfaces or colors. I can manipulate the viepoints - it is interactive but no colors or surfaces. This is repeated in many other tests cases. It would be nice to get images from the snapshot gallery ;-)

Questions: 1. How can I force the rendering of surfaces? Is it a problem of Octave? 2. How can I access iso2mesh documentation? Currently I am just keeping links in a bowser. Any way to add it to GUI Octave?

I understand that GUI Octave is not the scope of this forum,but I am just trying to resolve it, perhaps it is a simple fix ;-)

Thank you very much for making it possible to use iso2mesh - great help!

Jacek Maitan


Time:: Wed Jan 18 2012 12:35:01 GMT-0800 (Pacific Standard Time)</timestamp>

Name:Qianqian Fang
Email
Institution:MGH
Message:
hi

Controlling mesh density on the surface and internal volume is possible with iso2mesh. You may want to take a look at this FAQ.

Let me know if you have any difficulties using these settings.

Qianqian


Time:: Fri Oct 14 2011 14:05:02 GMT-0400 (EDT)</timestamp>

Name:aalnabel
Email
Institution:Carleton University
Message:
Hi, I am using the v2m function to generate a volume mesh from microCT scans of bone. I am hoping to use the mesh in a finite element analysis and it would be useful for me if the surface of the mesh was fine and the inside relatively coarse. Another option would be to refine the mesh at select regions of the model. Have you ever done something like this?

Thank you


Time:: Tue Oct 11 2011 13:25:06 GMT-0400 (EDT)</timestamp>

Name:FangQ
Email
Institution:
Message:
hi Jose

 I am trying to generate a Comsol Multiphysics geometry by exporting it as a mesh from Matlab, ...
 using the original faces generated with the matlab function isosurface.
 Have you tried exporting your meshes to comsol multiphysics? What path would you recommend?

Currently, iso2mesh is able to produce generic mesh data, i.e.node - x/y/z coordinates, elem - tetrahedral node list and face - surface triangle node list. It is up to the users to convert these generic data to whatever format they need. If you have detailed file format specifications, I would also be glad to code the converter and add it to iso2mesh.

I also have the plan to write an IGES/DXF converter as the first step, since most CAD software support these two formats. Unfortunately, I haven't found any good examples and documentations. If any of you can help, that would be great.

(just a side note: be careful about the last columns of iso2mesh output arrays, they are regional labels. You should decide whether to use them or not when you write your converter).


Time:: Sat Mar 06 2010 00:45:17 GMT-0500 (EST)</timestamp>

Name:Jose Rey
Email
Institution:University of South Florida
Message:
I am trying to generate a Comsol Multiphysics geometry by exporting it as a mesh from Matlab, using the fem.mesh comsol object. I am using a function femmesh that works under the comsol-matlab interface. I am trying to learn how to take meshes generated with iso2mesh and getting them into comsol. Before trying iso2mesh I was trying to generate the volume of my meshes with the matlab function delaunay3 and using the original faces generated with the matlab function isosurface.

Have you tried exporting your meshes to comsol multiphysics? What path would you recommend?

By the way, Thanks very much for sharing iso2mesh.


Time:: Thu Feb 25 2010 07:54:36 GMT-0500 (Eastern Standard Time)</timestamp>
Powered by Habitat