[vtkusers] correct use of vtkActor->SetPosition for translate + rotate

[Dženan Zukić]

If I remember correctly, actors have a few matrices. Are you changing the
right one? This might help:
http://public.kitware.com/pipermail/vtkusers/2009-August/102309.html

<http://public.kitware.com/pipermail/vtkusers/2009-August/102309.html>HTH

On Mon, Mar 21, 2011 at 15:53, Sergio Aguirre <sergio.aguirre at gmail.com>wrote:

> Hi everyone
>
> I am doing a small app that using a tracking system to interact with
> several actors (2 to 3) in a render window.
>
> Basically what I do is to:
>
> 1 - Set up a scene by placing each actor by using Actor->SetPosition() in
> the place I want it to be. - (Actors appear to be placed correctly once I
> render).
> 2 - The using a line I test for intersection points and if the do then I go
> to step 3. - (I am able to point to the objects but once my code validates
> the intersection its not necessarily in the in the place that I placed the
> actor in step 1)
> 3 - Pass a 4x4 Matrix to the actor via Actor->PokeMatrix(), this is done in
> a cycle. - (I am able to interact and rotate + translate the object). .
> 4 - Once I let the actor go, I cant "pick" it in the place I left it, I
> need to go back to the coordinates where I picked it in step 2.
>
> So my question is, if I am building a a scene:
>
> a) - What is the correct method to place and control an actor's location?
> b) - When passing a matrix via PokeMatrix do I need to "update" the actor
> or make sure that all concatenations are done to be able to pick it where I
> left it?
>
> Hope you can suggest some sources for review.
>
> Thank you,
>
> Sergio
>
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