Action:
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Removes a single element from an existing pattern.
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Filename:
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kern/kern_scm/pattern_scm.cxx
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Syntax:
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(pattern:remove-element pat coords)
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Arg Types:
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pat
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pattern
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coords
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pair
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Returns:
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pattern
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Description:
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Removes the element specified by
coords from an existing pattern.
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pat specifies a pattern.
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coords identify the element in the pattern to be removed.
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Example:
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; pattern:remove-element
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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
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height 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-radial 4)
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;; num-radial
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(define num-angular 5)
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;; num-angular
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(define spacing 3)
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;; spacing
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(define pat (pattern:radial
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center normal num-radial num-angular spacing))
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;; pat
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; remove the center element
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(set! pat (pattern:remove-element
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pat (list 0 0)))
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;; #[pattern
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;; trans-vec:
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"DOMAIN(VEC(-1,0,0)*COS
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;; (1.256637061435917*X2)*3*X+VEC
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;; (0,-1,0)*SIN(1.256637061435917*X2)
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;; *3*X+VEC(1,2,3),0,3,0,4)"
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;; x-vec:
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"VEC(-1,0,0)*COS
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;; (1.256637061435917*X2)
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;; +VEC(0,-1,0)*SIN
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;; (1.25663706143591?7*X2)"
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;; y-vec:
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"VEC(0,0,1)"
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;; z-vec:
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"null_law"
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;; scale:
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"null_law"
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;; keep:
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"PIECEWISE(X>0,X,X2<1)"
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;; [list]]
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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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