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The
keep_start_face option specifies the profile face used to sweep remains available after the sweep operation. This is useful when the sweep path is a closed loop, or when selective Booleans will be used after the sweep.
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For example, a circular profile can be swept around a circle, resulting in a torus. By default, once the torus is created, the start face is removed, along with information about where the torus surface starts and ends. When
keep_start_face is turned on, the start face is left as part of the resulting model, as demonstrated in Example 1-29. This acts as a "handle" for the start and end location. If the swept torus were to be used in a selective boolean process, the handle would be necessary. For example, the API function
api_boolean_tube_body makes use of the start face.
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The
sweep_to_body option should not be used with
keep_start_face.
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Scheme Example
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; Keep start face
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(option:set "sil" #t)
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(define profile (edge:ellipse (position 10 0 0)
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(gvector 0 0 1) 2.5))
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(entity:set-color profile 2)
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(define path (edge:ellipse (position 0 0 0) (gvector 0 1 0) 10))
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(define torus1 (sweep:law profile path))
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; OUTPUT Sweep to Body
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(entity:check torus1)
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;; checked:
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1 lumps
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1 shells
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0 wires
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1 faces
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0 loops
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0 coedges
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0 edges
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0 vertices
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(part:clear)
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(option:set "sil" #t)
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(define profile2 (edge:ellipse (position 10 0 0)
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(gvector 0 0 1) 2.5))
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(entity:set-color profile2 2)
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(define path2 (edge:ellipse (position 0 0 0) (gvector 0 1 0) 10))
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(define torus2 (sweep:law profile2 path2 (sweep:options
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"keep_start_face" #t)))
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; OUTPUT Keep Start Face
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(entity:check torus2)
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;; checked:
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1 lumps
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1 shells
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0 wires
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2 faces
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3 loops
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3 coedges
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1 edges
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1 vertices
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Example 1-29. Sweep with keep_start_face option
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Figure 1-34. Keep Start Face
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