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The spiral2 pattern creates a double spiral that winds around the z-axis similar to spiral1
except that it has two overlapping spirals which twist in opposite directions. The result sometimes looks like a
basket weave or perhaps the skin of pineapple. The center of a sunflower also has a similar double spiral pattern. Its
syntax is:
pigment
{
spiral2 Number_of_Arms
[PIGMENT_MODIFIERS...]
}
The Number_of_Arms value determines how may arms are winding around the z-axis. As a normal
pattern, the syntax is
normal
{
spiral2 Number_of_Arms [, Bump_Size]
[NORMAL_MODIFIERS...]
}
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.
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