This method sets or quits the anaglyph eye filter

Copies all the properties of observer except engine from a objetc observer

This method sets or quits the cross eye filter

This method creates a cross eye mask It is equal to side by side mask

This method sets or quits the interlaced filter

This method creates a interlaced mask

This method is used to set the kind of filter we want to use (when we are in anaglyph or interlaced mode)

This method moves the far plane in orther to see all the scene objects

This method sets all the parameteres that a observer needs.

This method sets or quits the side by side filter

This method creates a sideBySide mask

This method swaps the "open" eye. If we are using the path_l eye to look at the OpenGL world, it "close" it and "open" the path_r eye, and viceversa