[vtkusers] Picking and Annotation

[David Gobbi]

Try vtkDataSetSurfaceFilter or one of the vtkGeometryFilters.

   David


On Thu, Jan 28, 2010 at 9:20 AM, Rakesh Patil <rakeshthp at in.com> wrote:
>
> Is there anyway to convert unstructured grid to polydata..?? coz what i am
> using here is unstructured grid. And the output of any filter is polydata.
>
> ---------- Original message ----------
> From:Karthik Krishnan< karthik.krishnan at kitware.com >
> Date: 27 Jan 10 22:42:37
> Subject: Re: [vtkusers] Picking and Annotation
> To: Rakesh Patil
>
> On Wed, Jan 27, 2010 at 12:00 PM, Rakesh Patil wrote:
>>
>> HI..
>>
>> Thanks to all for your replies..
>>
>> To David Gobbi,
>> I want it just to highlight the cell so that next time again when user
>> clicks some other cell,
>> then, the current cell, which is highlighted ( or which is black), should
>> become white and
>> the newly selected cell, must be highlighted.
>>
>> I also thought the same thing, but, later on i thought, that we need to
>> use
>> two actors. and
>> i guess, it can be done with one.. So just to find whether there is any
>> possibility that this task
>> can be achieved by using single actor or not,
>
> Yes it can, by adding a dataarray containing scalars for cell data.
> And then having the polydata colored by cell data. But this is a
> terrible overkill to color just one cell. You should really use 2
> actors.
>
>> i posted my question.
>> Nevertheless, i'll tr to implement this first.
>>
>> Thanks.
>>
>> ---------- Original message ----------
>> From:Karthik Krishnan< karthik.krishnan at kitware.com >
>> Date: 27 Jan 10 22:07:21
>> Subject: Re: [vtkusers] Picking and Annotation
>> To: Rakesh Patil
>>
>> And be prepared to handle z fighting issues.. using one of the
>> standard ways.. also see
>> vtkMapper::ResolveCoinicidentTopologyToPolygonOffset
>>
>> On Wed, Jan 27, 2010 at 10:27 AM, David Gobbi wrote:
>>> Hi Rakesh,
>>&g t;
>>> The method that you use to annotate the cell will depend on whether
>>> you want to permanently color the cell, or whether you just want to
>>> highlight it.
>>>
>>> If you just want to highlight the cell, then the best thing to do is
>>> make a new polydata, set its color to black, and then add the picked
>>> cell to the new polydata. Then add this new polydata to an actor and
>>> add the new actor to the renderer so that it will render the black
>>> cell over the original cell. Use the vtkGenericCell as an
>>> intermediate for getting the cell from the original polydata and
>>> adding it to the new polydata.
>>>
>>> By doing things this way, you would leave the original polydata
>>> unchanged, and create a new "annotation" actor that has your picked< br>>
>>> cells. I'm not sure if this is would meet your needs, but it would be
>>> a straightforward way of visualizing the cell pick.
>>>
>>> David
>>>
>>>
>>> On Wed, Jan 27, 2010 at 7:01 AM, Rakesh Patil wrote:
>>>> Hello,
>>>>
>>>> I want to implement picking. With the help of an example,
>>>> annotatePick.tcl,
>>>> i'm able pick a cell, but annotation is not possible..
>>>>
>>>> I am displaying a triangular mesh. And when the user clicks on any of
>>>> the
>>>> cell of the mesh, i need that particular cell to be filled with black.
>>>> Only
>>>> that particular cell has to be annotated as a filled black color.
>>>>
>>>> Is it possible..?? After picking i'm getting cellid, of the cell which
>>>> is
>>>> selected. How can i do the annotation..??
>>>>
>>>> Thanks in advance
>>>>
>>>> Regards
>>>>
>>>>
>>>> D ear vtkusers ! Ge t Yourself a cool, short @in.com Email ID now!
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>
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