TITLE: Tornado Farm NAME: Kevin Lynn COUNTRY: USA EMAIL: klynn@telefish.net WEBPAGE: http://www.Flavorplex.com TOPIC: Force of Nature COPYRIGHT: I SUBMIT TO THE STANDARD RAYTRACING COMPETITION COPYRIGHT. MPGFILE: tornadof.mpg RENDERER USED: Aladdin 4D TOOLS USED: MainActor HARDWARE USED: 1.4 GHz Athlon-based PC ANIMATION DESCRIPTION: A local TV news team captures a tornado touching down in a rural area. VIEWING RECOMMENDATIONS: squint DESCRIPTION OF HOW THIS ANIMATION WAS CREATED: Aladdin 4D has a couple of unusual features that came in handy here. One is a particle emitter called Fountains. Another is heirarchical path-based animation. Instead of the now ubiquitous key-frame approach, A4d allows you to assign polygons (or fountains, or other paths) to follow and be otherwise constrained by a path. Both of these features were used to make the vortex. The rest of the drawing is polygon models, with some procedural textures and a few bitmap textures.