[vtkusers] vtkVisibleCellSelector and vtk 6.2
Ahmet Doğan
isimtic at gmail.com
Wed May 21 03:55:13 EDT 2014
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 It has been replaced by vtkHardwareSelector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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