vtkBillBoardTextActor3D uses obsolete bounds
vtkBillboardTextActor3D::GetBounds
is incorrect. If I change the vtkBillboardTextActor3D
's MTime by changing it's position or the input text, you'd want to recompute the quad since it's position is no longer valid. However, this method doesn't realize that and simply returns old bounds which can be quite wrong leading to incorrect clipping decisions when rendering.