[vtkusers] Help with vtkActor->SetOrigin()

[王君臣]

what you need is a multiplication (PostMultiply) of m_defaultTrf to the
current actor transform not a replacement.


2010/5/24 Anant Vemuri <ajar108 at gmail.com>

> Hi,
>
> I am trying to use myVtkActor->SetOrigin(origin) to set the origin so that
> any rotations I apply is done about this point. This is what I do to build
> the pipeline
>
>
> void buildPipeline( )
> {
>     m_actor->SetMapper( m_mapper );
>     m_actor->SetOrigin( 100, 100, 100 );
>     m_defaultTrf->Scale(m_scale, m_scale, m_scale);
>     m_defaultTrf->PostMultiply();
>     m_defaultTrf->Concatenate( this->getTransform() );
>     /// I add some more things to the m_defaultTrf
>     .
>     .
>     .
>     m_actor->SetUserTransform( m_defaultTrf );
>     }
>     std::cout << "\n\n\nOrigin = [" << m_actor->GetOrigin()[0] << ", " <<
> m_actor->GetOrigin()[1] << ", " << m_actor->GetOrigin()[2] << "]\n\n\n";
> }
>
> But when I apply the transform in the scene, it is not being about some
> other point entirely. I noticed that this is the same point when I remove
> the SetOrigin() line. But in the last line it gives me the origin as the one
> that I set a few line earlier. I am not able to figure out what is the
> mistake. Can anyone help me?
>
> Thank you.
> Anant.
>
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