CODEWITHSUNDEEP
vtk
Bla...
Bla...

Reputation: 7288

How to update Actor after applying Transformation?

Currently I apply translation to an actor through below code:

vtkSmartPointer<vtkTransform> translation =
    vtkSmartPointer<vtkTransform>::New();
translation->PostMultiply(); //this is the key line
translation->Translate(translationVector);
patella->getActor()->SetUserTransform(translation);

However, if I apply 

patella->getActor()->SetUserTransform(translation);

again. The actor stays at the same position as if I applied it only once. I know it's because the origin is not updated. Thus, how can I update the origin/actor after each translation?

Upvotes: 1

Views: 1591

Answers (1)

mirni
mirni

Reputation: 695

You want to concatenate the transforms. Something like:

vtkActor* patellaActor = patella->GetActor();
vtkTransform* patellaXfm = patellaActor->GetUserTransform();
if (!patellaXfm) {
    patellaActor->SetUserTransform(translation);
} else {
    patellaXfm->Concatenate(translation);
}

Upvotes: 2

Related Questions