Dolby 3D

Each filter allows different frequencies of red, green, and blue light to pass through each of them.

The filters are able to each produce a common color gamut but transmit light at different wavelengths.

In this way, one projector can display the left and right stereoscopic images in an alternating cadence that is not visible to the guest.

In alternate forms one filter is placed in each of two projectors, both pointed at the same screen, one displaying the right eye image and one displaying the left eye image simultaneously.

[1] This method of stereoscopic projection is called wavelength multiplex visualization, and was created by Infitec.