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

[Ashika Umanga Umagiliya]

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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