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Amiga Plus Extra 1996 #6
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AmigaPlus-eXtra-6-96.iso.7z
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AmigaPlus-eXtra-6-96.iso
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programme
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a-render
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lathe.doc
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1987-03-22
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Lathe Instructions:
------------------
A step-by-step procedure for creating an arrow through the heart.
Lathe is a program for creating objects of revolution. To make an object
of revolution, you specify a contour shape. The shape is then rotated
around an axis. Samples of objects of revolution are a cylinder (in this
case an arrow shaft), and cones (our arrow head and feather). Other
samples could be a lampshade (round ones, not the oblong type), a pencil,
or a glass.
To create the arrow, we will create three objects of revolution. These
three surfaces of revolution are the feather on the left, the shaft in
the middle, and the head at the right. I drew this out on graph paper
first, and recommend you do the same when designing new objects.
Y+
. _
. - . _ .
. - .______________________________________________________. .
-------------------------------+---------------------------------------
X- + is 0,0 X+
(extreme = X -7.6 ) (extreme = X +8)
This view is the cross section of the arrow.
Let's go right ahead and make these objects!
The first object:
Start by typing 'lathe <return>'
and respond to the prompts with the following values -
Number of Points 2
X -5 !! Never type in a
Y .2 zero for X or Y.
X 7 See the next two
Y .2 objects where I
use .001 instead
of zero. !!
Degrees of Rotation 360
Number of Polygons in Rotation 12
This entry must be zero 0
This also must be zero 0
Filename shaft.obj
The shaft object file has now been created.
The second object:
Start by typing 'lathe <return>'
and respond to the prompts with the following values -
Number of Points 3
X 7
Y .1
X 7
Y .6
X 8
Y .001 !! Remember, never enter
a zero here !!
Degrees of Rotation 360
Number of Polygons in Rotation 12
This entry must be zero 0
This also must be zero 0
Filename head.obj
The head object file has now been created.
The third object:
Start by typing 'lathe <return>'
and respond to the prompts with the following values -
Number of Points 3
X -7
Y .001
X -7.6
Y .7
X -3.3
Y .001
Degrees of Rotation 360
Number of Polygons in Rotation 12
This entry must be zero 0
This also must be zero 0
Filename feather.obj
The feather object file has now been created.
The objects have now been created, now go back to Define to place them in
the scene (through the heart). See the DOC file MORE_DEFINE.DOC .