POV-Ray : Documentation : Spiral1
  POV-Ray 3.6 Documentation Online View Spherical Spiral2 Spiral1

The spiral1 pattern creates a spiral that winds around the z-axis similar to a screw. When viewed sliced in the x-y plane, it looks like the spiral arms of a galaxy. Its syntax is:

        spiral1 Number_of_Arms

The Number_of_Arms value determines how may arms are winding around the z-axis.

As a normal pattern, the syntax is

        spiral1 Number_of_Arms [, Bump_Size]

where the Number_of_Arms value is a required parameter but the float Bump_Size which follows is optional.

Note: the comma is required especially if Bump_Size is negative.

The pattern uses the triangle_wave wave type by default but may use any wave type. Spherical Spiral2

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