Position detection of a light source

A method of generating position signals, the method comprising:

• receiving electromagnetic radiation from a first point source at a mask;
• projecting the radiation from two apertures in the mask to a detection surface that is sensitive to the electromagnetic radiation;
• and
• converting the radiation received at the detection surface into two sets of coordinates representative of three dimensional position of the first point source.

A method of controlling a cursor on a display coupled to a computer, the method comprising:

• receiving electromagnetic radiation from a first point source;
• projecting the radiation from two apertures separate from the first point source to a detection surface that is sensitive to the electromagnetic radiation;
• converting the radiation received at the detection surface into two sets of coordinates representative of position of the first point source;
• converting the coordinates to a location for a cursor;
• and
• displaying the cursor on the display in accordance with the location.

A computer readable medium having instructions for cause a computer to perform a method comprising:

• receiving position information from a position detection device having a detection surface that detects radiation from a point source through two openings in a mask spaced a fixed distance from the detection surface;
• identifying the position information corresponding to the position of the point source;
• and
• translating the position information into cursor control signals.