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Action:
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Gets the normal of a given planar edge or curve.
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Filename:
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kern/kern_scm/crv_scm.cxx
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Syntax:
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(curve:normal edge-or-curve)
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Arg Types:
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edge-or-curve
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edge | curve
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Returns:
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gvector
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Description:
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This extension returns a gvector that is normal to the given curve.
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edge-or-curve specifies an edge or a curve. If the
curve is linear,
#f is returned.
#f is also returned if the
curve is nonplanar
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Example:
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; curve:normal
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; Create a circular edge.
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(define edge1
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(edge:circular
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(position 0 0 0) 25 0 185))
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;; edge1
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; Determine the normal to the edge.
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(curve:normal edge1)
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;; #[gvector 0 0 1]
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; Create a linear edge.
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(define edge2
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(edge:linear (position -10 -10 0)
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(position 20 20 0)))
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;; edge2
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; Determine the normal to the edge, which
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; should return #f because it is not a curve.
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(curve:normal edge2)
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;; #f
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