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Amiga Collections: Memphis Amiga Group
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MAG Disk 111 (1989-03)(Memphis Amiga Group).zip
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radioii_read
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1986-11-06
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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