[vtkusers] How to make series of transformation?

[rakesh patil]

Thanks Dženan Zukić. I'll try that and let you know. :-)

On Thu, Mar 15, 2012 at 2:19 PM, Dženan Zukić <dzenanz at gmail.com> wrote:

> First of all, doing 3 transformations on a polydata like that
> is inefficient. Try this:
>
> vtkSmartPointer<vtkTransform> ntrans =
> vtkSmartPointer<vtkTransform>::New();
> ntrans->Translate(np);
> ntrans->RotateZ(rot_angle);
> ntrans->Translate(pp);
> //perhaps do this in reverse order (or turn on postMultiply)
> //also take a look at matrix returned by ntrans->GetMatrix(), it is
> helpful for debugging
>
> vtkSmartPointer<vtkTransformPolyDataFilter> nTranslateFilter =
>        vtkSmartPointer<vtkTransformPolyDataFilter>::New();
> nTranslateFilter->SetInput( polyData );   // polyData is an object of type
> vtkPolyData
> nTranslateFilter->SetTransform(ntrans);
> nTranslateFilter->Update();
>
> vtkSmartPointer<vtkPolyDataMapper> pdmapper =
> vtkSmartPointer<vtkPolyDataMapper>::New();
> pdmapper->SetInputConnection(nTranslateFilter->GetOutputPort() );
> pdmapper->ScalarVisibilityOff();
>
> vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New();
> actor->SetMapper(pdmapper);
>
> On Thu, Mar 15, 2012 at 04:31, rakesh patil <prakeshofficial at gmail.com>wrote:
>
>> Hello,
>>
>> I am using this particular code to perform the following set of
>> transformations
>>
>> Translate -> Rotate -> Translate
>>
>> vtkSmartPointer<vtkTransform> ntrans =
>> vtkSmartPointer<vtkTransform>::New();
>> ntrans->Translate(np);
>>
>> vtkSmartPointer<vtkTransform> ptrans =
>> vtkSmartPointer<vtkTransform>::New();
>> ptrans->Translate(pp);
>>
>> vtkSmartPointer<vtkTransform> rotateTrans =
>> vtkSmartPointer<vtkTransform>::New();
>> rotateTrans->RotateZ(rot_angle);
>>
>> vtkSmartPointer<vtkTransformPolyDataFilter> nTranslateFilter =
>>        vtkSmartPointer<vtkTransformPolyDataFilter>::New();
>> nTranslateFilter->SetInput( polyData );   // polyData is an object of
>> type vtkPolyData
>> nTranslateFilter->SetTransform(ntrans);
>> nTranslateFilter->Update();
>>
>> vtkSmartPointer<vtkTransformPolyDataFilter> rotateFilter =
>>        vtkSmartPointer<vtkTransformPolyDataFilter>::New();
>> rotateFilter->SetInputConnection( nTranslateFilter->GetOutputPort() );
>> rotateFilter->SetTransform(rotateTrans);
>> rotateFilter->Update();
>>
>> vtkSmartPointer<vtkTransformPolyDataFilter> pTranslateFilter =
>>        vtkSmartPointer<vtkTransformPolyDataFilter>::New();
>> pTranslateFilter->SetInputConnection( rotateFilter->GetOutputPort() );
>> pTranslateFilter->SetTransform(ptrans);
>> pTranslateFilter->Update();
>>
>> vtkSmartPointer<vtkPolyDataMapper> pdmapper =
>> vtkSmartPointer<vtkPolyDataMapper>::New();
>> pdmapper->SetInputConnection(pTranslateFilter->GetOutputPort() );
>> pdmapper->ScalarVisibilityOff();
>>
>> vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New();
>> actor->SetMapper(pdmapper);
>>
>>
>> With this code, I can see that the transformation is done only till
>> rotation. Next translation is not shown. Can anyone point out where I am
>> going wrong?
>>
>> Thanks in advance
>>
>> Regards
>> Rakesh Patil
>>
>>
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