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Submitted by , posted on 18 April 2003
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Image Description, by
This is from a game demo I recently produced. The image really doesn't
do it justice as in motion the fan turns causing a shadow to drift
across the board (ala Carmacks reverse and some vertex shaders for
shadow volumes), the green guys jiggle, and the lightning arcs nicely.
The game is Antivirus and it's a basic puzzle game. I used its creation
to try out Cg as well, so it makes use of some Cg vertex shaders. It
took me about a week from concept to demo, including learning the ins
and outs of Cg. Here's a quick rundown of the features:
Vertex Shaders : NVIDIA and ARB vertex program extensions through Cg
Dynamic textures : rendered real time with bound Pbuffers
Noise Deformation : deforms vertices over time via Vertex shaders
Vertex blending : creates smooth transitions between node states
Random Lightning : interesting & random arcs based on noise
Shadow Volume extrusion : dynamic via vertex shaders
Dynamic Shadows : Zfail/Carmack's reverse for robust shadows
Fullscreen glow : using Dynamic texturing
If you want to download it from the link below but be warned it requires
you to download the Cg Compiler (10megs) from nVidia (link in the
README.txt) and have a card that is supported (GF3+, Radeon 9200+).
Usual disclaimers apply, feel free to send me comments.
NOTE: The Cg scripts are plain text and compiled at runtime that's just
how Cg likes it. I don't want to hear anything about poor commenting or
formatting in them ;). Also don't try to learn from them I am an
obfuscated coder and these were my first Cg scripts.
http://www.cyberonic.net/~bwyatt/antivirusGL.zip
and if you don't have the Card to run that version you can download the
basic version which has all the gameplay with none of those nasty
graphical candies (or instructions for that matter):
http://www.cyberonic.net/~bwyatt/antivirus.zip
Editor's note: If you're having trouble with the links above,
the downloads are available here (831k) as well.
-bart
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