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Action:
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Gets the direction in the parameter space of a surface at a given position that corresponds to a given object-space tangent direction.
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Prototype:
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SPApar_dir bs3_surface_invdir (
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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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Description:
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Usually, this routine will normalize the result of calling
bs3_surface_unitvec.
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Errors:
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Returns an empty
SPApar_dir if the input surface is null.
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Limitations:
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Results are not defined for points that do not lie on the surface.
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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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