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Action:
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Determines the offset in parameter space corresponding to a unit move in a direction on a 3D B-spline surface at a given position.
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Prototype:
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SPApar_vec bs3_surface_unitvec (
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SPAunit_vector const& dir,// given direction
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SPApar_pos const& uv,
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// given parameter point
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bs3_surface bs
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// given surface
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);
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Includes:
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#include "kernel/acis.hxx"
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#include "baseutil/vector/param.hxx"
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#include "baseutil/vector/unitvec.hxx"
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#include "kernel/spline/bs3_srf/bs3surf.hxx"
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#include "kernel/spline/bs3_srf/sp3srtn.hxx"
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Errors:
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Returns an empty
SPApar_vec if the input surface is null.
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Library:
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kernel
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Filename:
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kern/kernel/spline/bs3_srf/sp3srtn.hxx
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Effect:
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Read-only
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