Reference:Spiral2 Pattern
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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.