Again, obstructing light in a matrix beam system doesn't work for
multiple objects. is just like to use two switches per key in a matrix
system, one switch interrupts the rows line another interrupt the
columns, you would never know where are two or more objects.  Except if
all objects are in the same row or the same column.

Probably if you use a third axis (Z), horizontal as the others are,  but
in angle between X and Y you could isolate the multiple hits.


"M. Adam Davis" wrote:
[snip]
> Shine lasers across the surface(about 2-5mm above the surface) in a grid pattern
[snip]