This directory contains some mappings which may be applied by vwarp
to any image to get a feel for what vwarp will do for you. The mappings
were designed for use on 512x512 images, but will work on anything - you'll
just get different results.

When starting out, be sure to use matched pairs of coefficients - i.e.
use twistx and twisty together. Later on you can play with combining
coefficients for x and y from different mappings and get real strange
objects!

Mappings:

ROTATE     - Perform a 45 degree rotation and shrink
             Files: source - source tiepoints
                    target - target tiepoints
                    rotatex and rotatey - coefficients
                    rotate - output image

TWIST      - Performs an hourglass twist with bilinear coefficients.
             Files: source - source tiepoints
                    target - target tiepoints
                    twistx and twisty - coefficients
                    twist - output image

TRI1       - Maps the original image into a triangle with bilinear
             coefficients.
             Files: source -source tiepoints
                    target - target tiepoints
                    tri1x and tri1y - coefficients
                    tri1 - output image

TRI2       - Maps the original image into a triangle, but puts a twist
             in with it, joining the bottom with the top! This is attempted
             with bilinear coefficients - you'll see that it's not
             possible when you look at the result.
             Files: source - source tiepoints
                    target - target tiepoints
                    tri2x and tri2y - coefficients
                    tri2 - output image

WEIRD       - Performs essentially a 1-1 mapping except the girls right
              eyeball gets mapped from (255,255) to (400,400). This one
              uses a bi-quadratic computed using vpolyco.
              Files: source - source tiepoints
                     target - target tiepoints
                     weirdx and weirdy - coefficients
                     weird - output image
