[vtkusers] vtkVoxelContoursToSurfaceFilter - control number of triangle of the generated mesh ?

[Jothy]

Won't vtkSmoothPolyDataFilter help?

Jothy

On Fri, Oct 22, 2010 at 10:49 AM, Ashika Umanga Umagiliya <
aumanga at biggjapan.com> wrote:

> Thanks Jothy for your reply,
>
> My problem is ,vtkVoxelContoursToSurfaceFilter can not generate mesh from
> vtkPolyData because of number of nodes/and or/ (x,y) range of my nodes.
>
> Here are the images:
>
> Source image size ( around 1000x1000 )pixels.
>  - http://oi55.tinypic.com/2e2f2xd.jpg .
>
> So,the maximum x,y coordinates of contour data is also in the range
> 1000x1000.
>  - http://oi51.tinypic.com/4lt9c3.jpg ,
> , every small circle is added as a "vtkPoint" when generating
> "vtkPolyData".
>
> Generated mesh has huge number of triangles.
> Here is the genereated mesh - http://oi51.tinypic.com/98soib.jpg
> Wireframe of the mesh  - http://oi51.tinypic.com/r7ly10.jpg
> Zoomed in -  http://oi53.tinypic.com/r08k07.jpg
>
> If the node range is 1000x1000 and number of Z axis slices is about 200
> then vtkVoxelContoursToSurfaceFilter crash.
>
> On 22 October 2010 18:00, Jothy <jothybasu at gmail.com> wrote:
>
>> I think you could reduce it by running vtkdecimatepro on the mesh.
>>
>> BTW, I could not see any of your images.
>>
>> Jothy
>>
>> On Fri, Oct 22, 2010 at 2:09 AM, Ashika Umanga Umagiliya <
>> aumanga at biggjapan.com> wrote:
>>
>>> Anyone ..please?
>>>
>>> On 20 October 2010 12:20, Ashika Umanga Umagiliya <aumanga at biggjapan.com
>>> > wrote:
>>>
>>>> Greetings all,
>>>>
>>>> We generate contour data using a seperate contour detecting algorithm
>>>> and use "vtkVoxelContoursToSurfaceFilter" to generate the mesh.
>>>> Source image size is around 1000x1000 pixels.
>>>> Please refer image at - http://oi55.tinypic.com/2e2f2xd.jpg .
>>>>
>>>> So,the maximum x,y coordinates of contour data is also in the range
>>>> 1000x1000.
>>>> As see in the image at - http://oi51.tinypic.com/4lt9c3.jpg ,
>>>> , every small circle is added as a "vtkPoint" when generating
>>>> "vtkPolyData".
>>>>
>>>> At first vtk could not generate mesh and crashed .
>>>> So I divide original node x,y data by 5 (scaled down by 5) before
>>>> sending to  "vtkPoints.SetPoint()".
>>>>
>>>> Still the generated mesh has huge number of triangles.
>>>> Here is the genereated mesh - http://oi51.tinypic.com/98soib.jpg
>>>> Wireframe of the mesh  - http://oi51.tinypic.com/r7ly10.jpg
>>>> Zoomed in -  http://oi53.tinypic.com/r08k07.jpg
>>>>
>>>> My question is ,is there a way to produce the optimized number of
>>>> triangles for the mesh ? ()
>>>> Our target image range is from 512x512 to 2000x2000. (that is,counter )
>>>> Any tips of adjusting the best triangle count depend of the image size?
>>>>
>>>> Thanks in advance,
>>>> umanga
>>>>
>>>
>>>
>>> _______________________________________________
>>> Powered by www.kitware.com
>>>
>>> Visit other Kitware open-source projects at
>>> http://www.kitware.com/opensource/opensource.html
>>>
>>> Please keep messages on-topic and check the VTK FAQ at:
>>> http://www.vtk.org/Wiki/VTK_FAQ
>>>
>>> Follow this link to subscribe/unsubscribe:
>>> http://www.vtk.org/mailman/listinfo/vtkusers
>>>
>>>
>>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.vtk.org/pipermail/vtkusers/attachments/20101022/0f418030/attachment.htm>