- Why xyzw ?
(a) In 3d programming, the notation of four dimensional vectors is common. The fourth dimension
is usually called w and is usually set to 1 or 0. This simplifies some notation, and can be
further exploited for perspective transform. Most 3d hardware uses vector registers
with components usually called x, y, z and w.
(b) rgba was already registered.
- What is a demo
A demo is a computer program that generates video and audio in realtime.
It's only use is to entertain the audience. People spend time developing demos
because that's thier way of expressing themself or because they think they
can impress someone with thier skill.
- What is an intro
Sometimes computer nerds want to impress someone even more by doing a demo
with the limitiation that all programm code, graphics data and sound data must
fit within 64k.