- double Xover = (x - mSlicers[slicer]->GetOverlay()->GetOrigin()[0])
- /mSlicers[slicer]->GetOverlay()->GetSpacing()[0];
- double Yover = (y - mSlicers[slicer]->GetOverlay()->GetOrigin()[1])
- /mSlicers[slicer]->GetOverlay()->GetSpacing()[1];
- double Zover = (z - mSlicers[slicer]->GetOverlay()->GetOrigin()[2])
- /mSlicers[slicer]->GetOverlay()->GetSpacing()[2];
- valueOver = this->GetScalarComponentAsDouble(static_cast<vtkImageData*>(mSlicers[slicer]->GetOverlayMapper()->GetInput()), Xover, Yover, Zover);
+ vtkImageData *overlay = dynamic_cast<vtkImageData*>(mSlicers[slicer]->GetOverlayMapper()->GetInput());
+ double Xover = (x - overlay->GetOrigin()[0]) / overlay->GetSpacing()[0];
+ double Yover = (y - overlay->GetOrigin()[1]) / overlay->GetSpacing()[1];
+ double Zover = (z - overlay->GetOrigin()[2]) / overlay->GetSpacing()[2];
+ valueOver = this->GetScalarComponentAsDouble(overlay, Xover, Yover, Zover);