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1996-11-15
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******* THE ZAXIS OPTION OF COPY & MOVE FUNCTIONS ********
THIS TUTORIAL EXPLAINS THE CONCEPT OF THE OPTION "ZAXIS"
AVAILABLE IN ALL COPY FUNCTIONS. REMEMBER THAT THE ZAXIS
IS AN IMPORTANT 3 DIMENSIONAL ATTRIBUTE.
<end>
FIRST LET US CREATE A VIEW POINT.
<end>
NOW LET US DRAW A GRID AT GROUND LEVEL ZERO, OR ZAXIS=0.
THIS GRID IS A SIMPLE PLANE ALONG THE X&Y AXIS, THEREFORE,
"XY" OPTION IS ASSIGNED TO IT. IT IS ALSO A SHAPE NOT
MADE FROM A CLOSED POLYGON, BUT MADE FROM A NUMBER OF
PARALLEL LINES IN PERPENDICULAR DIRECTIONS. THEREFORE
THE ATTRIBUTE "TRANS" (TRANSPARENT) IS ASSIGNED TO IT.
<end>
HERE IS A TECHNIQUE FOR DRAWING A SINGLE STEP AND COPYING
IT MANY TIMES TO CREATE A 3D STAIRCASE.
<end>
THIS STEP IS .15 METERS HIGH AND IS AT GROUND LEVEL ZERO,
OR ZAXIS=0 (SEE DATA LINE ABOVE).
<end>
SELECT THE FUNCTION "SINGLE COPY" AND SELECT OPTION "ZAXIS"
ENTERING 0.15 METERS. NOTICE THAT EACH COPY OF THE STEP
IS AUTOMATICALLY RAISED ANOTHER 0.15 METERS.
<end>
IT IS POSSIBLE TO OVERLAP STEP SLIGHTLY.
<end>
NOW LET US REDO THE SINGLE COPY FUNCTION WITH AN OVERLAP
SPECIFYING A ZAXIS OF 0.15 METERS.
<end>
THE SAME EFFECT MAY BE ACHIEVED MUCH MORE QUICKLY USING THE
FUNCTION LINEAR COPY.
<end>
NOW LET US ILLUSTRATE HOW ANOTHER RUN OF THE SAME NUMBER
OF STAIRS CAN BE MADE QUICKLY AND EASILY USING THE FUNCTION
COMPLETELY CONTAINED COPY.
BUT FIRST LET US FIND OUT HOW HIGH IS THE HIGHEST STEP BY
USING THE FUNCTION "3D EDITING" AND SELECTING THE HIGHEST
STEP.
<end>
LOOKING AT THE DATA LINE ABOVE, THE BOTTOM OF THE HIGHEST
STEP IS AT 1.35 METERS. ADD TO IT THE RISER OF 0.15 METERS
FOR A TOTAL OF 1.5 METERS.
IT IS EASY TO LOSE OUR THREE DIMENSIONAL ORIENTATION AND
ACCIDENTALLY MIRROR A COPY OF THE EXISTING STAIRS RATHER
THAN ROTATING A COPY OF IT. LET US SHOW YOU THIS PROBLEM.
<end>
EVENTHOUGH IN PLAN THE MODEL LOOKS CORRECT, AS WE SAW, THE
CORRECT SOLUTION IS TO ROTATE THE COPY 180 DEGREES ASSIGNING
IT A ZAXIS VALUE OF 1.5 METERS. THIS INCREASES THE ZAXIS
VALUE OF EACH STEP COPIED BY 1.5 METERS. HERE IS WHAT THE
STAIRS WOULD LOOK LIKE IF THE ZAXIS IS NOT INCREASED BY 1.5.
<end>
NOW LET US INCREASE THE ZAXIS VALUE OF EACH COPY BY 1.5.
<end>
HERE IS THE TECHNIQUE FOR DRAWING A SPIRAL SHAPE, SUCH AS
A SPIRAL STAIRCASE USING THE "ZAXIS" OPTION OF THE
RADIAL COPY COMMANDS.
<end>
ANOTHER IMPORTANT APPLICATION OF USING "ZAXIS" OPTION OF
COPY FUNCTIONS IS WHEN YOU NEED TO COPY MANY 3D BLOCKS FROM
ONE LEVEL TO THE NEXT LEVEL OF A MULTI-STORY BUILDING.
<end>
NOW LET US COPY EVERYTHING EXCEPT THE GRID WITH A COPY
FUNCTION WHILE SPECIFYING A ZAXIS VALUE OF 3.2 METERS FOR
THE NEW COPY.
<end>
END OF LESSON 012
<end>