BspCrvBiNormal

Section: C Library Functions (3)
Updated: IRIT Version 6.0
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NAME

BspCrvBiNormal()  

SYNOPSIS

cagd_lib/cbsp_aux.c:512

CagdVecStruct *BspCrvBiNormal(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
SYNOPSIS
DESCRIPTION
PARAMETERS:
FUNCTION RETURN VALUE
ORIGIN

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