Going all the way back to my first sample – (the Plasma Demo Effect), I was porting another old Pascal Demo effect of mine at the same time – a basic Fire effect. I never bothered finishing it off back then, instead moving onto more interesting things. I recently returned to complete it since it was 90% done.
The effect itself is quite simple, and is really nothing more than a filter applied over a 2D grid. You can tweak the config variables to make it taller, wider, more/less colours, etc. It’s quite a simple thing.
You can download the source here: [Download]