vtkSphereWidget scale can cause the radius become not-a-number
This issue was created automatically from an original Mantis Issue. Further discussion may take place here.
Turn on ScaleOn() option when using vtkSphereWidget. Scale down to the smallest and beyond and then GetRadius() will give not-a-number. Maybe something in this function causes this issue:
void vtkSphereWidget::ScaleSphere(double *p1, double *p2, int vtkNotUsed(X), int Y)