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Element Spiral
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Spiral
  Spiral is an element used for creation of every possible spirals (flat spiral, conical helix, and many other types).
It has the following parameters:
"1.Radius,(m)" - radius of spiral in the start (metres).
"2.Height,(m)" - height of spiral (metres).
"3.Number of turns" - number of spiral turns (full-screw): it's possible set non-integer values too.
"4.Crossection width(m)" - width of crossection in the start of the spiral (metres).
"5.Crossection height(m)" - height of crossection in the start of the spiral (metres).
"6.Crossection shape(1-4)" - type of crossection shape: 1,2 - rectangular, 3 - rhombus, 4 - circle (integer).
"7.Ratio of Radius" - ratio of radius: start-radius to end-radius of the spiral (if the parameter is equal "1" the spiral has constant radius).
"8.Ratio of Width" - ratio of width: start-width to end-width of crossection (if the parameter is equal "1" the spiral has constant width of crossection).
"9.Ratio of Height" - ratio of height: start-height to end-height of crossection (if the parameter is equal "1" the spiral has constant height of crossection).
"10.Points in circle(3-50):" - quantity of points describing a base circle of the spiral (integer).

Range of use: curved walls, spiral stairs.
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