MAKE a VOLUMETRIC PROJECTOR from JUNK

Step 5 How the first one's image was generated.

The diagram shown is a rough plan of how "the first one" did generate the three images
that made the image of a rotating cube. The large pattern on the top represents the
appearance of the top of the virtual image, which was not actually coded.

Below each image is the series of dot matrix LED patterns quickly displayed
in order, as the rotor turned, so that a cube appeared in one of the three frames
animating it's rotation. Each of the small patterns represents a slice of the
3D frame, as the LEDs light , as the rotor passes through the image.

These were very carefully constructed because this particular device was limited
to displaying patterns that could appear on the LED display without multiplexing.
Each pattern is one that could result from power being applied continuously to
the LED display. That was necessary because the display was not very bright,
and would have been a lot dimmer with multiplexing.

Since a square is not among the patterns that could be displayed this way,
the most obvious way to display a 3D cube was not among the three frames.

So "the first one" (the 3D device built on a fan) was very limited and primitive and no more useful than for
showing that a 3D rotating cube could be displayed and people would say "wow".