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- Lyap is a Vista DEM landscape generator for portions of Lyapunov Space.
- For more details on Lyapunov Space, see the September 1991 issue of
- Scientific American, Mathematical Recreations section. To run Lyap, you
- need to specify a Vista Landscape filename, an 'a' and 'b' value
- (between -3.5 and 0), a divisor (258.0 covers a width of exactly 1.0,
- a larger divisor covers a smaller area, and a smaller one a larger
- area.), a scale factor to make the function values come out as reasonable
- elevations, a pattern of which values to iterate with, and a number of
- iterations. An iteration value of 1 takes about 3 minutes with Lyap.881
- on an Amiga 3000/25mhz. A value of 200 takes about 6 hours. The value
- used in the Scientific American article would take days to compute.
- Although smaller values will not give the spectacular images shown in the
- Scientific American article, they do create rather extrordinary landscapes
- in their own right. To start off with, I recommend the command line:
-
- 1>Lyap test.scape -2.8 -2.8 133.0 100.0 aaabaaa 10
-
- which will produce an unusual landscape. Varying the 'a' and 'b' values
- will move around in the scape, and you can focus in on a given area by
- increasing the divisor. The larger the iteration value, the smaller you
- will want to make the scaling factor. This is not that important, as you
- can rescale the landscape from within VistaPro.
-
- This program is Copyright © 1991 by Virtual Reality Laboratories, Inc.
- Permission is granted by the above to freely copy and distribute this
- program as long as this ReadMe file is included with the distribution.
-
- For those who want to mess with the source, it is written in SAS 'C'.
- Place the Amiga.h and Lyap.h files in the same directory as Lyap.c.
-
- lc -O -f8 -Lm881 Lyap.c --- For 68030/68881 operation
- lc -O -Lm Lyap.c --- For generic 68000 operation.
-