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

[Darshan Pai]

YOu can also try using vtkQuadricClustering to reduce the number of
triangles.

On Fri, Oct 22, 2010 at 6:01 AM, Jothy <jothybasu at gmail.com> wrote:

> 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
>>>>>
>>>>
>>>>
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>>
>
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