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README.TXT
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1989-12-07
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GFA RAYTRACE 2.1 7.12.89
1. GFA Raytrace 2.1 was recompiled with GFA Basic 3.0 Compiler
which resulted in approx 30% reduction in calculation time
and also 30% reduction in code size (about 32K smaller).
2. Please note that on the PROGRAM disc there is a
program LISTOBJ.PRG. When run this program will offer the
file selector box, so that you may enter a WF* file name.
If you have a printer connected, all of the colour values
and positions of objects and lamps will be printed.
3. It has come to our attention that on Atari Mega ST, the
HELP key may not always work. It is hoped that this bug
will be fixed in the next update.
4. SHOWANIM.PRG
The save screen function "S", in the SHOWANIM.PRG is
not implented in this version.
5. Some animation demomonstrations on the data disk are too
large to run on a 520ST. The length of an animation
sequence depends upon the amount of memory available.
6. SHOW512.OBJ
The SHOW512.OBJ can not be run directly. This is a routine
that can be called from GFA Basic programs to display GFA-
Raytrace 512 colour pictures. An example GFA program is
contained in the file SHOW512.LST.
7. Raytrace 2.1 now runs with TOS 1.4 and TOS 1.6.
8. Changes are made to the routines to produce objects (spheres)
of the type "BRIGHT" to obtain better results (smoother
colour change)
9. In the raytrace-menu (F2) there is a new option called
"RAINBOW" which can be turned on or off by simply clicking
in the surrounding box. This means that, if you're using
some coloured lamps, the effect of each lamp on each object
will be bigger (normally when RAINBOW=OFF an effect of a
lamp on an object depends on the distance). This results in
more colourful pictures if you use several coloured lamps
and white objects.
10. Old object-types were: Dull/Bright/Mirrored.
New types are: Dull/Bright/Mirrored/Transparent.
11. To use transparency you select this item in the 'Material'-
menu (see manual) and select a percentage (% - like you do
with Mirrored). Default is 60%. Transparency means you can
'look through' an object. So an object of that type will not
produce a full (black) shadow, but a grey one. And the
colour of that object is a mixture of the object's own
colour and what's behind it. The degree of mixing depends on
your choice (10% is hardly transparent, 100% is totally
transparent).
Update release information is available in the independent GFA
User Magazine. GFA User also offers an update service for all GFA
products to registered users only.
Registered owners of GFA Raytrace can purchase GFA Basic 2.0
interpreter and compiler, direct from GFA for £19.95, including
post, packing and VAT.
Please submit orders direct to GFA Data Media (UK) Ltd
Box 121
Wokingham
Berkshire
RG11 9LP
(0734) 794941
Updates of GFA Raytrace are also available from GFA User, Send
3.00 pounds with original disks to receive latest update. This is
version 2.0. You will also receive a free copy of the independent
GFA User Magazine. Existing subscribers to GFA User can update
their GFA product at a reduced cost of 1.50 pounds.
For articles on GFA Raytrace and information on public domain
raytraced images and utilities, please refer to the independent
GFA User Magazine. Available from:
GFA User
186 Holland Street
Crewe
Cheshire
CW1 3SJ
Tel: 0270 256429