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

[Sergio Aguirre]

Thanks for the reply.

I had reviewed the link you sent and actually found that by passing my
pointer matrix to the UserMatrix it had a odd offset when applying the
rotations and translations that are (at least in my current implementation)
done correctly by passing the matrix to PokeMatrix.

I think my problem is more in the way I test for intersection by a line... I
am using vtkOBBTree that takes vtkDataSet as an input and perhaps I am not
updating the my actor's ivars to the (for example) vtkConeSource ivars.

Will let you know in a few.

Sergio

2011/3/21 Dženan Zukić <dzenanz at gmail.com>

> 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
>>
>> _______________________________________________
>> Powered by www.kitware.com
>>
>> Visit other Kitware open-source projects at
>> http://www.kitware.com/opensource/opensource.html
>>
>> Please keep messages on-topic and check the VTK FAQ at:
>> http://www.vtk.org/Wiki/VTK_FAQ
>>
>> Follow this link to subscribe/unsubscribe:
>> http://www.vtk.org/mailman/listinfo/vtkusers
>>
>>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.vtk.org/pipermail/vtkusers/attachments/20110321/6f3acb7d/attachment.htm>