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-
- RADIOII 10-FEB-89
-
- RadioII is a SA4D (Sculpt-Animate 4D) overscan video mode animation of
- a radiometer doing its thing. Since this was my first animation, I wanted
- something simple so I borrowed the idea from an animation called Radio by
- Dr Gandolf. I hope he doesn't mind. Since the animation repeats itself
- every quarter turn of the solar vanes, only nine images were required with
- a 10 degree rotation of the vanes per cube (ray-trace). When played back at
- one video frame per image, the looping animation would make the vanes appear
- to make a full rotation. Those nine frames however took 3 days to render
- (whew!) running 24 hours a day on an almost stock Amiga 2000. Not stock
- because I do have some fast ram and are running on a 68010. The 68010 only
- gives a marginal increase in performance, but worth the $25.00 I guess. One
- thing to keep in mind though is that any object with a glass surface takes
- a long time to render. All those visible surfaces, reflections and like
- that. I think I see a 68020/68881 accelerator with 32 bit ram in my near
- future (ahhhhhh!).
-
- I have included Movie 1.3 so just click on the provided icon to view
- the animation. One strange thing though. The SA4D manual states that the
- current version (Movie 1.3) will not play back animations using the SA4D
- new video mode. In a moment of lunacy in the light of a full moon, I
- decided to try it anyway. It flashed into my thoughts "The pale orb is
- affecting me, grab the wolfbane!", because it actually worked! Of course it
- is still necessary to invoke the incantation of setting the stack to 8000
- or higher. However those words will be spoken for you, if you run the
- animation using my icon.
-
- For those of you who are interested in how the real thing works. It is
- composed of lightweight vanes alternately blackened on one side and white
- on the other. These vanes are suspended in a partial vacuum so as to revolve
- about a central axis when exposed to sunlight. The light falling on these
- vanes transfers heat to each one, but not to the same degree. The lighter
- side reflects the rays, while the dark side absorbs them. When the freely
- moving particles of air in the partial vacuum inside the Radiometer strike
- the reflective white sides of the vanes, they take on very little energy
- and bounce off slowly. However, when the atoms strike the dark side, they
- take on a great deal of energy and bounce off very fast. The "opposite
- reaction" forces being greater on one side than the other then moves the
- vanes.
-
- I hope you enjoy my animation. The only thing I ask is that this readme
- file is kept intact with the animation in any archive file or distribution.
- If you wish to contact me, I can be reached at the following BBS's.
-
-
- El Amigo (619) 299-9804 8N1 San Diego, Ca
- The Mouse Trap (619) 462-3975 8N1 San Diego, Ca
-
- or on Genie at address "BagEnd"
-
- Larry D Crandall
- SDAUG Librarian
- San Diego, California
-