[vtkusers] TIN to regular mesh
Marc Huber
marchuber.hft at gmx.de
Fri Apr 12 07:08:45 EDT 2013
This is exactly what I want thanks!
It just doesnt take my scalar values to build regions
i have scalar values like e.g.
3548
3548
3549
3549
3549
3549
3549
3549
3550
3550
for each value I want to create regions if there is a connection
my problem is, that I just get 1 big region, but depending on my values
i should get about 100 regions
My Code:
polydata->GetCellData()->SetScalars(arr); //arr contains my scalars
for each cell (Type: vtkFloatArray)
vtkSmartPointer<vtkPolyDataConnectivityFilter> regionFilter =
vtkSmartPointer<vtkPolyDataConnectivityFilter>::New();
regionFilter->SetInputConnection(polydata->GetProducerPort());
regionFilter->ScalarConnectivityOn();
regionFilter->SetFullScalarConnectivity(1);
regionFilter->SetScalarRange(1,9090);
regionFilter->SetExtractionModeToAllRegions();
regionFilter->SetColorRegions(1);
regionFilter->Update();
vtkSmartPointer<vtkPolyDataMapper> conMapper =
vtkSmartPointer<vtkPolyDataMapper>::New();
conMapper->SetInputConnection(regionFilter->GetOutputPort());
conMapper->Update();
stlActor->SetMapper(conMapper);
RenderData(stlActor); //my function for rendering
Am 11.04.2013 18:07, schrieb Bill Lorensen:
> There is a "region growing" filter in VTK.
> // .NAME vtkPolyDataConnectivityFilter - extract polygonal data based
> on geomet\
> ric connectivity
> // .SECTION Description
> // vtkPolyDataConnectivityFilter is a filter that extracts cells that
> // share common points and/or satisfy a scalar threshold
> // criterion. (Such a group of cells is called a region.) The filter
> // works in one of six ways: 1) extract the largest (most points)
> connected reg\
> ion
> // in the dataset; 2) extract specified region numbers; 3) extract all
> // regions sharing specified point ids; 4) extract all regions sharing
> // specified cell ids; 5) extract the region closest to the specified
> // point; or 6) extract all regions (used to color regions).
> //
>
>
>
>
> On Thu, Apr 11, 2013 at 11:13 AM, Marc Huber <marchuber.hft at gmx.de
> <mailto:marchuber.hft at gmx.de>> wrote:
>
> i want to divide objects into polygons (regions) which point in a
> very similiar direction.
>
> I have computed normal vectors for the points of the object.
> now i want to extend a method of image processing to 3D.
> in an image i'm growing regions with similar color values starting
> from different seed points.
> this i want to apply in a changed way to the 3D space
> my normal vectors are my "color values" and I want to iterate
> through the 3D space to grow regions.
>
> if i have no regular spacing between the points i might get problems
>
>
>
> Am 11.04.2013 16:44, schrieb Bill Lorensen:
>> You could create a volume of distances to the triangles. The
>> distance field will have regular spacing in x,y,z but the x,y,z
>> value will be distance to the surface.
>>
>> Are you trying to compute something? Maybe if we know what the
>> final problem is we can provide some ideas.
>>
>>
>>
>> On Thu, Apr 11, 2013 at 8:54 AM, Marc Huber <marchuber.hft at gmx.de
>> <mailto:marchuber.hft at gmx.de>> wrote:
>>
>> unfortunatelly not. I need it and hoped that vtk is able to
>> do this.
>> I have to iterate through point clouds with a regular spacing
>> like iterating through pixels of an image. So in fact I don't
>> even need te visualization, just the point cloud extracted
>> from the visualization.
>> thanks for your help
>> Best regards
>> Marc
>> *Gesendet:* Donnerstag, 11. April 2013 um 14:45 Uhr
>>
>> *Von:* "Bill Lorensen" <bill.lorensen at gmail.com
>> <mailto:bill.lorensen at gmail.com>>
>> *An:* "Marc Huber" <marchuber.hft at gmx.de
>> <mailto:marchuber.hft at gmx.de>>
>> *Cc:* "VTK Users" <vtkusers at vtk.org <mailto:vtkusers at vtk.org>>
>> *Betreff:* Re: Re: [vtkusers] TIN to regular mesh
>> I don't know of a vtk filter that does this.
>> Do you have a reference for an algorithm that does this?
>> On Thu, Apr 11, 2013 at 8:43 AM, Marc Huber
>> <marchuber.hft at gmx.de <http://marchuber.hft@gmx.de>> wrote:
>>
>> Sorry for leaving so much unclear.
>> I have closed volumes e.g. a CAD model of a pipe
>> Best regards
>> Marc Huber
>> *Gesendet:* Donnerstag, 11. April 2013 um 14:22 Uhr
>> *Von:* "Bill Lorensen" <bill.lorensen at gmail.com
>> <http://bill.lorensen@gmail.com>>
>> *An:* "Marc Huber" <marchuber.hft at gmx.de
>> <http://marchuber.hft@gmx.de>>
>> *Cc:* "VTK Users" <vtkusers at vtk.org
>> <http://vtkusers@vtk.org>>
>> *Betreff:* Re: [vtkusers] TIN to regular mesh
>> What source of object is being modeled? Is it a closed
>> volume? An elevation map?
>> On Thu, Apr 11, 2013 at 2:09 AM, Marc Huber
>> <marchuber.hft at gmx.de <http://marchuber.hft@gmx.de>> wrote:
>>
>> I need a quad mesh where the point distance in x and
>> y direction is always the same.
>> Best regards
>> Marc
>>
>> Am 10.04.2013 um 21:52 schrieb Bill Lorensen
>> <bill.lorensen at gmail.com
>> <http://bill.lorensen@gmail.com>>:
>>
>> What is your definition of "regular mesh"? A
>> regular triangular mesh is one where each element
>> has 3 edges and the valence of each interior
>> point is 6. A regular quad mesh is one where each
>> element has 4 edges and the valens of interior
>> points is 4.
>>
>> On Wed, Apr 10, 2013 at 11:50 AM, Marc Huber
>> <marchuber.hft at gmx.de
>> <http://marchuber.hft@gmx.de>> wrote:
>>
>> Hi,
>> I have a CAD model, which is triangulated.
>> What I'd like to do is to create a regular
>> mesh of it.
>> I already searched in the archives and found
>> out that it might help to use shepard. I
>> awfully don't get it managed to solve this
>> problem. Maybe I’m also just searching with
>> the wrong keywords.
>> Has maybe somebody some example code for
>> this? (if c++, tcl, python,... doesn't matter)
>> I'd be very thankful if anybody could help me.
>> Best regards
>> Marc
>>
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>
>
> --
> Best regards / Mit freundlichen Grüßen
> Marc Huber
>
>
>
>
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> Unpaid intern in BillsBasement at noware dot com
--
Best regards / Mit freundlichen Grüßen
Marc Huber
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