[vtkusers] newbie question: vtkPicker

[Bruno da Silva de Oliveira]

Hi,

It depends on how you are rendering your data. Each particle is a 
separate actor? If so, use a vtkPropPicker instance. If you're rendering 
a single polydata, and each particle is a cell, you will have to use 
vtkCellPicker.

With both classes, you would call the method Pick giving the (x, y) 
coordinates of the mouse position (remember to flip the Y axis if 
necessary), and use on the methods of the class to get the picked 
actor/cell (GetActor() in vtkPropPicker and GetCellId() in vtkCellPicker).

HTH,

Iwona i Janusz Goldasz wrote:

> Dear all: I am seeking an answer regarding the vtkPicker class. I 
> am pretty much a newcomer to the world of VTK.
> In my java app, I use vtk for visualizing particle systems motion 
> (discrete element method simulations). One particular feature
> I would like to have is to be able to pick/select a specific particle 
> with a mouse and query its present behavior/properties at a given
> simulation step.
>  
> All 3D graphics is build/rendered into a vtkPanel panel object.
>  
> From what I have learned vtkPicker would probably suit my needs - I am 
> looking for any examples of the picker's application
> regardless programming language used (c++, python, java, ???). Unless 
> somebody could point into a different direction if there is one.
>  
> I am rewriting my code from java3D into java and vtk I had this 
> feature implemented with my j3d application and it was quite useful.
>  
> Regards & appreciate any suggestions,
> Janusz Goldasz
> ----------------------------------------------------------------------
> Kobieto, dziewczyno, matko, zono, kochanko... KLIKNIJ PO WIECEJ!
> >>> http://link.interia.pl/f18e5
>
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-- 
Bruno da Silva de Oliveira
bruno at esss.com.br
ESSS - Engineering Simulation and Scientific Software
http://www.esss.com.br