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Action:
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Returns the B-spline approximation information for a face.
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Filename:
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kern/kern_scm/qfac_scm.cxx
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Syntax:
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(face:bs in-face [extra-info=#f])
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Arg Types:
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in-face
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face
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extra-info
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boolean
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Returns:
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real | real...
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Errors:
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-1 when there is no B-spline to evaluate.
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Description:
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Returns the number of control points in u and
v.
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in-face specifies the face to be queried.
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extra-info is an optional argument. If it is set to true (#t), then additional B-spline information is returned. The default value is false (#f).
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Example:
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; face:bs
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; Create topology to demonstrate command.
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(define path (edge:spline (list (position 0 0 0)
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(position 10 0 0) (position 10 10 0))))
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;; path
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(define profile (edge:ellipse
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(position 0 0 0) (gvector 1 0 0)
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(gvector 0 0 1)))
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;; profile
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(define pipe (sweep:law profile path))
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;; pipe
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(define face (list-ref (entity:faces pipe) 0))
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;; face
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; Get the B-spline approximation information.
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(face:bs face)
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;; (14 20)
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