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Action:
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Creates a polar-grid 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_polar_grid_pattern
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Syntax:
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(pattern:polar-grid center normal num dist
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[start] [not-rotate=#f] [hex-symmetry=#f]
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[start-angle=0] [end-angle=360] [ratio=1])
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Arg Types:
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center
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position
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normal
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gvector
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num
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integer
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dist
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real
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start
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gvector
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not-rotate
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boolean
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hex-symmetry
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boolean
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start-angle
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real
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end-angle
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real
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ratio
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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 polar-grid pattern. The pattern coordinates are specified in the order (radial, angular).
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center defines the root position (that may or may not lie upon the seed entity).
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normal vector sets the orientation of the pattern.
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num specifies the number of rings in the grid (including the center).
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dist specifies the distance between the rings.
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start is an optional argument that specifies the direction of the first spoke of the pattern.
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If
not-rotate is true (#t), the elements of the pattern are kept in a fixed relative orientation.
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If
hex-symmetry is true (#t), the hexagonal symmetry is maintained for patterns extending either 360 or 180 degrees.
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start-angle and
end-angle arguments fix the angular extent of the pattern.
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ratio argument sets the ratio of minor/major radii at the pattern perimeter.
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Example:
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; pattern:polar-grid
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; make a prism
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(define height 1)
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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 0.5)
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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 prism (solid:prism height
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maj_rad min_rad num_sides))
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;; prism
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; position the prism
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(define origin (position 1 2 3))
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;; origin
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(define transform (entity:transform prism
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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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; make a pattern
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(define center origin)
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;; center
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(define normal (gvector 0 0 1))
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;; normal
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(define num_rings 5)
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;; num_rings
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(define spacing 4)
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;; spacing
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(define pat (pattern:polar-grid
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center normal num_rings spacing))
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;; pat
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; apply the pattern to the prism
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(define body (entity:pattern prism pat))
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;; body
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