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Action:
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Creates a spherical pattern.
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Filename:
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kern/kern_scm/pattern_scm.cxx
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APIs:
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api_spherical_pattern
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Syntax:
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(pattern:spherical center num-latitudes
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root [spacing])
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Arg Types:
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center
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position
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num-latitudes
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integer
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root
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position
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spacing
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real
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Returns:
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pattern
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Description:
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Creates a two-dimensional spherical pattern about the
center position, with the seed pattern entity at one pole of the associated sphere. The pattern coordinates are specified in the order longitude, latitude.
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center specifies the center of the spherical pattern.
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num-latitudes specifies the number of latitudinal rings in the pattern. If
num-latitudes is set to zero, this number is instead determined by the optional
spacing parameter.
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root specifies the root position of the pattern.
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spacing is an optional argument specifying the distance between the elements. The spacing must be given if
num-latitudes is zero.
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Example:
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; pattern:spherical
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; make a pyramid
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(define height 0.5)
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;; height
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(define maj_rad 1)
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;; maj_rad
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(define min_rad 0.1)
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;; min_rad
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(define num_sides 3)
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;; num_sides
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(define pyramid
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(solid:pyramid height maj_rad min_rad num_sides))
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;; pyramid
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;position the pyramid
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(define origin (position 1 2 3))
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;; origin
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(define transform (entity:transform pyramid
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(transform:axes
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origin (gvector 1 0 0) (gvector 0 1 0))))
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;; transform
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(zoom-all)
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;; #[view 1508128]
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; output original
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; make a pattern
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(define center (position 1 2 -2))
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;; center
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(define num-latitudes 10)
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;; num-latitudes
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(define root origin)
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;; root
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(define pat
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(pattern:spherical center num-latitudes root))
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;; pat
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; apply the pattern to the pyramid
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(define body (entity:pattern pyramid pat))
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;; body
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; output Result
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Figure 14-6. Spherical Patterns
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