guile-sdl demo-2 available

[Thien-Thi Nguyen]

folks,

i was not able to resist playing w/ guile-sdl some more.
the result is tarball:

 http://www.glug.org/people/ttn/software/guile-sdl/demo-2.tar.gz

good news is that i found a small bug in guile-sdl w/ this play.
bad news is that i missed an opportunity to brush up on 3d coord
transforms, instead relying on memory and fallback to simpler but
less efficient chained 2d computation (grep for "suboptimal").
tips from 3d wizards welcome.

for the curious, the name "space-frisk" is because the idea/code
was adapted from circle-frisk, a previous hack using guile-xlib.
(where is that project these days?)

thi