[vtkusers] Picking and Annotation

[Karthik Krishnan]

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 <david.gobbi at gmail.com> wrote:
> Hi Rakesh,
>
> 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
> 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 <rakeshthp at in.com> 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
>>
>>
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