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fractga.eng
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1996-05-28
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The following arguments must be passed to FRACTGA:
COMPULSORY : the name of the Targa file to process(?)
OPTIONAL : the following:
-Wnn : width of picture in pixels (max 2048)
-Hnn : height of picture in pixels (max 2048)
-L : no smoothing
+L : smoothing (default setting)
-Nnn : maximum number of iterations (gives the maximum number of
colours; max 1024, default is 32)
-Pf.f : P constant used in calculation of Julia set
-Qf.f : Q constant used in calculation of Julia set -Xx.x : X limit of the
set in question (goes from -x.x to +x.x)
-Yy.y : Y limit of the set in question (goes from -y.y to +y.y)
Please note that in order to obtain a realistic height_field, the definition
of the picture (in number of pixels) is more important than the number of
colours (number of different tiers of height-field). The smoothing option
is also critical; with smoothing off the height-field will be very jagged;
smoothing set to on produces some very realistic mountains.
For using FRACTGA under MULTITOS and getting the most out of GEMVIEW
display for the TGA files generated:
The two environment variables must be installed first, giving the path and
complete name of GEMVIEW and FRACTGA. (The GEMVIEW variable can be
omitted however if you have installed GEMVIEW as an accessory.)
Include in the GEM.CNF file, for example:
setenv GEMVIEW=f:\gv220\gemview.app
setenv FRACT=f:\pov\fractga\fractga.ttp
Launch MINTSHEL.TTP under TOSWIN, then enter a command such as:
gem $FRACT f:\pov\nomfich.tga -w50 -h50 -L
As soon as the whole file has been written, FRACTGA asks GEMVIEW to
show it and passes control straight back to the user. While GEMVIEW
reads the TGA file you can be doing something else (isn't multitasking
wonderful!) Finally a window opens with your picture in it....
==========================================================================
English translation by Ralph Nelson-Tucker, May 1996
==========================================================================