+ //! Returns the number of peniding frames to render. If it is zero it
+ //! stops rendering frames.
+ //! \todo Fix the calculation of frames to really render the last frame
+ //! When start frame= 1f and end frame = 1f it just render one frame (at 1f)
+ //! When start frame= 1f and end frame = 2f it just render one frame (at 1f)
+ //! which is a bug.