[vtkusers] vtkVisibleCellSelector and vtk 6.2

[Ahmet Doğan]

On 21.05.2014 04:38, David E DeMarle wrote:
>
>
> On Tuesday, May 20, 2014, Ahmet Doğan <isimtic at gmail.com 
> <mailto:isimtic at gmail.com>> wrote:
>
>     frustum behaves like box clip doesn't it?
>
>
> There are differences, but yes very similar.
>
>      I just need to extract cells by user view or like xy xz yz axis.
>     like taking picture I don't need behind of dataset how can it be
>     done? not possible with vtk?
>
>
> I'ld love to be proven wrong but I don't think so, not in all cases. 
> It boils down to occlusion culling.
>
> Zooming lessens the pixel resolution problem in scan conversion or ray 
> casting, but isn't perfect.
>
> Extract surface into normal generation into frustum dotted with view 
> vector and cull the non negative results is close but it will get some 
> corner cases wrong too. It isn't resolution dependent at least.
>
what is that exactly because I need it just take a picture of an object 
from one side to put it 2d drawing that way ,there wont be edge. is 
there any example how can i do what you mean in vtk?
> I'ld like to hear about any other solutions out there since the 
> question comes up every once in a while.
>
>
>     On 21.05.2014 03:54, David E DeMarle wrote:
>
>>     Not much. It is a limitation of the screen space algorithm whch
>>     can pick at most one cell per pixel.
>>
>>     Frustum selection is an object space algorithm and doesn't have
>>     the same limitation, but it can not cull occluded cells.
>>
>>     On Tuesday, May 20, 2014, Ahmet Doğan <isimtic at gmail.com
>>     <javascript:_e(%7B%7D,'cvml','isimtic at gmail.com');>> wrote:
>>
>>
>>         On 21.05.2014 03:21, Ahmet Doğan wrote:
>>
>>             On 21.05.2014 03:12, Ahmet Doğan wrote:
>>
>>                 with vtkHardwareSelector cells are changing on
>>                 zooming How can I disable it.
>>
>>                 Please check the image I added
>>
>>                 thank you
>>
>>
>>                 On 20.05.2014 21:18, Bill Lorensen wrote:
>>
>>                     It has been replaced by vtkHardwareSelector
>>
>>
>>                     On Tue, May 20, 2014 at 2:01 PM, Ahmet Doğan
>>                     <isimtic at gmail.com> wrote:
>>
>>                         hi,
>>
>>                         What's happened vtkVisibleCellSelector in vtk
>>                         6 and up. I cant see any
>>                         information on migrate page
>>
>>                         Kind regards.
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>>
>>
>>
>>
>>
>>     -- 
>>     David E DeMarle
>>     Kitware, Inc.
>>     R&D Engineer
>>     21 Corporate Drive
>>     Clifton Park, NY 12065-8662
>>     Phone: 518-881-4909
>
>
>
> -- 
> David E DeMarle
> Kitware, Inc.
> R&D Engineer
> 21 Corporate Drive
> Clifton Park, NY 12065-8662
> Phone: 518-881-4909

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