[vtkusers] why does Scale method of vtkTransform have no effect?

[jim yu]

hi, everyone
 
here is the code, but the Scale doesn't have effect, why? 
 
vtkTransform* tf = vtkTransform::New(); tf->Scale(5, 5, 5); tf->RotateX(-45); tf->RotateZ(45); actor->SetUserTransform(tf); outlineactor->SetUserTransform(tf);
 
thanks a lot!
 
jim
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