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Action:
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Creates a pattern parallel to a surface.
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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_surface_pattern
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Syntax:
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(pattern:surface entity num-u num-v root
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[on-boundary=#f] [dir-u dir-v])
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Arg Types:
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entity
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entity
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num-u
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integer
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num-v
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integer
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root
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position
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on-boundary
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boolean
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dir-u
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gvector
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dir-v
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gvector
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Returns:
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pattern
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entity specifies a face entity.
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num-u and
num-v arguments specify the number of elements along u and v directions respectively.
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root specifies the position (which can be on or off the seed pattern entity, as desired) to be mapped to the pattern sites.
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If
on-boundary is set to true (#t), the pattern extends to the face boundary.
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If
dir-u and
dir-v are specified, the orientation of the pattern members follow the surface normal. In this case, these vectors specify the directions, relative to the seed entity, that are mapped to the u- and v-directions of the face. By default, pattern members are oriented identically to one another.
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Example:
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; pattern:surface
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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 pos origin)
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;; pos
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(define radius 20)
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;; radius
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(define long_start 0)
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;; long_start
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(define long_end 90)
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;; long_end
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(define lat_start -360)
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;; lat_start
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(define lat_end 360)
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;; lat_end
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(define normal (gvector 0 0 1))
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;; normal
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(define face (face:sphere pos radius
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long_start long_end lat_start lat_end normal))
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;; face
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(define u_num 8)
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;; u_num
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(define v_num 6)
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;; v_num
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(define root origin)
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;; root
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(define pat (pattern:surface face
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u_num v_num root))
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;; pat
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(entity:delete face)
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;; ()
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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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