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Action:
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Creates a new pattern by adding random offset to an existing 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_random_offset_pattern
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Syntax:
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(pattern:random-offset pat amplitude)
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Arg Types:
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pat
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pattern
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amplitude
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gvector
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Returns:
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pattern
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Description:
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Randomizes the given pattern by adding random offsets at each of the pattern sites.
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pat specifies a pattern.
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The components of the
amplitude argument determine, in magnitude, the maximum offsets that are imposed in each dimension.
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Example:
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; pattern:random-offset
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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
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(solid:prism 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 x-vec (gvector 4 0 0))
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;; x-vec
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(define num_x 12)
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;; num_x
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(define y-vec (gvector 0 4 0))
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;; y-vec
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(define num_y 12)
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;; num_y
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(define pat (pattern:linear x-vec num_x y-vec num_y))
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;; pat
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; modify the pattern
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(define amplitude (gvector 1 0.5 4.0))
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;; amplitude
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(set! pat (pattern:random-offset pat amplitude))
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;; #[pattern
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;; trans-vec:
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"DOMAIN(X*VEC(4,0,0)+X2*VEC(0,4,0),
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;; 0,11,0,11)"
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;; x-vec:
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"null_law"
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;; y-vec:
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"null_law"
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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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"null_law"
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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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