TITLE: Eyes Deceive
NAME: John Hoerr
COUNTRY: USA
EMAIL: jhoerr@one.net
TOPIC: Unbelievable
COPYRIGHT: I SUBMIT TO THE STANDARD RAYTRACING COMPETITION COPYRIGHT.
JPGFILE: jh_eyes.jpg
RENDERER USED: 
    POV-Ray for Windows

TOOLS USED: 
    PaperPort 5.3.1 for image maps, copyright text, and .jpg conversion

RENDER TIME: 
    Five hours

HARDWARE USED: 
    Pentium, 200 Mhz

IMAGE DESCRIPTION: 

Three "unbelievable" optical illusions.

Note -- The two upside-down portraits are of the late
composer John Cage.  The one on the right has been
reconstructed.  Try to imagine what he looks like
right-side up, then flip the image or turn your head to
the side to see the illusion.

DESCRIPTION OF HOW THIS IMAGE WAS CREATED: 

If you don't know how these illusions work, they do not
involve post-processing (just in case someone suspects).
Look closely at the shadows on the wall for a hint.

The trickiest part of this image was the fact that the
"impossible" triangle illusion works from only one viewing
angle.  This put a limitation on the number of ways to
compose the scene.  I did have some choice in the
placement of the crate, but in order to preserve the
illusion, I had to modify it whenever it was moved.  It
did occur to me that I could calculate the modifications
automatically in POV, but not until I had already settled
on its final location.

This is my first submission to the IRTC.  I have not
included the source because it has changed somewhat since
the image that I am submitting was rendered.  All of the
textures came from the POV include files, and I was in the
process of replacing them with my own when I ran out of
time (I didn't find out about the competition until 2
weeks ago).