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Action:
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Gets a rail curve to sweep for surface construction.
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Prototype:
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bs3_curve bs3_curve_rail_from_cen (
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bs3_curve input,
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// given curve
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SPAunit_vector up_dir,
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// up direction, normal
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// to the spline at start
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double twist_ang
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// twist angle
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);
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Includes:
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#include "kernel/acis.hxx"
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#include "baseutil/vector/unitvec.hxx"
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#include "kernel/spline/bs3_crv/bs3curve.hxx"
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#include "kernel/spline/sg_bs3c/sps3crtn.hxx"
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Description:
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To establish the twist angle, this routine uses the angle of rotation (in radians). The routine can also be used to get the lateral curves for sweep.
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As per the definition of the sweep, the
up_dir is propagated along the center curve.
up_dir is the normal to the plane formed by the center a nonplanar B-spline. Any normal is acceptable.
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The rail is constructed so that it forms a Frenet frame as it goes along the path curve to make up a sweep surface.
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For this routine, the center curve must be a cubic B-spline.
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Library:
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kernel
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Filename:
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kern/kernel/spline/sg_bs3c/sps3crtn.hxx
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Effect:
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Read-only
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