BzrCrvBiNormal
Section: C Library Functions (3)
Updated: IRIT Version 6.0
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NAME
BzrCrvBiNormal()
SYNOPSIS
cagd_lib/cbzr_aux.c:266
CagdVecStruct *BzrCrvBiNormal(CagdCrvStruct *Crv, CagdRType t)
DESCRIPTION
Returns a unit vector, equal to the binormal to Crv at parameter value t.
Algorithm: insert (order - 1) knots and using 3 consecutive control
points at the refined location (p1, p2, p3), compute to binormal to be the
cross product of the two vectors (p1 - p2) and (p2 - p3).
Since a curve may have not BiNormal at inflection points or if the 3
points are colinear, NULL will be returned at such cases.
PARAMETERS:
Crv: Crv for which to compute a unit binormal.
t: The parameter at which to compute the unit binormal.
FUNCTION RETURN VALUE
CagdVecStruct *: A pointer to a static vector holding the binormal
information.
ORIGIN
(C) Copyright 1989/90-95 Gershon Elber, Technion, IIT
Index
- NAME
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- SYNOPSIS
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- DESCRIPTION
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- PARAMETERS:
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- FUNCTION RETURN VALUE
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- ORIGIN
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