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- December 1990 Spiral_4d v. 1.2 © Bruce Thomson
-
-
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- This is Shareware. Donations of $US10 to the address below.
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- This program makes spring-like objects for Sculpt-4D. You have
- control over many aspects of shape and colouring.
-
- It makes a climbing spiral which has a copy connected below it
- giving the object some solidity. The radius of the spiral can
- change dynamically. It can be coloured by checkers that
- alternate from a list you supply or the colouring can be given as
- spreads of colours such as in the DPaint palette. You can get
- very smooth colour patterning this way by needing to enter only
- the start and end colour. This can be done is several blocks
- covering different parts of the spiral.
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-
-
- This program runs from Workbench and CLI. You will need
- 'req.library' in your LIBS: directory.
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-
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- Some values must be entered to define the spiral.
-
- To help describe them picture a spring sitting on the ground,
- upright. Imagine the coils as being made from paper tape.
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-
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- "Radius at base? & Radius at top?"
-
- Radius will move smoothly between the two as goes from bottom
- up. If the two values are different then the spring will become
- more tightly or loosely coiled along its length. E.g. To get a
- pointed shape make the base, say 100 wide and the top 5 wide.
- These values can have a fractional component.
-
-
-
- "Rise per rotation? & Edge offset?"
-
- Every coil of the spring will be "rise per rotation" above the
- one below. This value determines how stretched the spring looks.
- "Edge offset" is the width of the paper tape, or thickness of the
- coils. This is the distance between the top and bottom of the
- paper tape. This value works together with "rise per rot." to
- control the compactness of the spring. If the value is slightly
- less than "rise per rot." then the spring will be quite
- substantial and compact. If the value is only a fraction of
- "rise per rot." then the spring will look more like it is made of
- wire. If this is too high it will overlap onto the coil below,
- or push up into the one above. Both values need not be integers.
-
-
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- "Multiplication factor for copy?"
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- This value can be used for extra effects. Your spring need not
- just be made of paper tape. The lower edge of the tape need not
- just hang straight below the upper. This value can push it
- further out or move it closer towards the axis of rotation. If
- the value is less than one then the radius of the copy will be
- less than the radius of the original spiral at all points. If
- the value equals one then it will hang straight below. If
- greater than one it will be pushed out further. Your spring can
- thus be made to have some horizontal thickness. This value can
- be fractional.
-
-
-
- "Number of rotations? & Number of points?"
-
- The number of coils the spring will have, and the total number
- of points, or segments, along the whole of the spring. These
- values work together to control how smooth the spring looks.
- E.g. with 2 rotations and 50 points you would have 25 points for
- each circle. With 10 rotations and 40 points your spring would
- have four sides rising up through ten coils. The number of
- rotations can be fractional but number of points must be an
- integer.
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-
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- "X translation? & Y translation?"
-
- As well as spiralling upwards the whole spring can lean in one
- direction or another. These values determine the position of the
- axis of rotation at the end relative to the original position. It
- is a shear, not a rotation. E.g. if you want it to lean
- forwards-right. Make X positive and Y negative. Good for
- movement in anims. Both values can be fractional.
-
-
-
- "Colouring type? Checkers or Spreads"
-
- Checkers: Alternating colours from a series you enter. You
- will need to enter how many checkers there are then enter the
- colours for each one. This is made easy as you only need to
- adjust the highlighted colour in the colour requester. Do this
- and click on OK for each check.
-
- Spreads: Your will be coloured with smooth ranges of colours.
- The number of points you entered earlier is the number of
- segments your spring is made of. Each one can be coloured
- individually but the easiest way is to enter the start and end
- point and then the colours you would like to spread between.
- Enter the start and end segment. A colour requester will pop up
- and this is where you select the colours. Adjust the highlighted
- colour and then the one to its right and then click on OK. The
- colours between will be spread amongst the segments in the range
- you specified. Cancel the 'start point?' requester to finish
- entering spread data. To help you enter the numbers for the
- ranges the program gives as default values ranges made of equal
- steps based on your previous entries. Ensure you colour the
- whole of the spring or some will be left black. The segments
- range from number zero to the maximum points.
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-
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- Finally you will be prompted for a filename to write the object
- off to.
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-
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- Note: All measurements are in the same units.
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- EXAMPLES:
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- Smooth tube shape:
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- Radius bottom = 50
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- Radius at top = 50
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- Edge offset = 150
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- Rise per rotation = 0
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- Multiplier = 1
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- Number of rotations = 1
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- Number of points = 50
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- Skinny, stretched out spring, small at bottom, wide at top.
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- Has a square profile:
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- Radius bottom = 20
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- R at top = 100
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- Edge offset = 5
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- Multiplier = 1
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- Rise per rot = 20
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- Number of rots = 6
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- Number of points = 24 /*gives 24/6=4 points per circle */
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- Flat disk with a hole in the middle:
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- Radius at bottom = 10
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- Radius at top = 10
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- Edge offset = 0
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- Rise per rotation = 0
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- Multiplier = 4
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- Number of rots = 1
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- Number of points = 40
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- Author:
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- Bruce Thomson
-
- PO Box 33116
-
- Takapuna
-
- Auckland
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- NEW ZEALAND
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-