chrono::ChBasisToolsNurbs Class Reference

Description

Tools for evaluating basis functions for NURBS, parametrized with parameter u (as lines) These bases are often called "R" in literature.

#include <ChBasisToolsNurbs.h>

Static Public Member Functions
static void	BasisEvaluate (const int p, const double u, const ChVectorDynamic<> &Weights, const ChVectorDynamic<> &Knots, ChVectorDynamic<> &R)
	Compute vector of bases R. More...
static void	BasisEvaluateDeriv (const int p, const double u, const ChVectorDynamic<> &Weights, const ChVectorDynamic<> &Knots, ChVectorDynamic<> &R, ChVectorDynamic<> &dRdu)
	Compute vector of bases R and their first derivatives. More...
static void	BasisEvaluateDeriv (const int p, const double u, const ChVectorDynamic<> &Weights, const ChVectorDynamic<> &Knots, ChVectorDynamic<> &R, ChVectorDynamic<> &dRdu, ChVectorDynamic<> &ddRddu)
	Compute vector of bases R and their first and second derivatives. More...

Member Function Documentation

BasisEvaluate()

static void chrono::ChBasisToolsNurbs::BasisEvaluate ( const int  p, const double  u, const ChVectorDynamic<> &  Weights, const ChVectorDynamic<> &  Knots, ChVectorDynamic<> &  R  )

inlinestatic

Compute vector of bases R.

Evaluate ALL the p+1 nonzero basis functions R of a 1D(line) NURBS, at the i-th knot span, given the parameter u, the order p, the knot vector Knots, the weights Weights. Results go into the row vector R = { R1, R2, R3.... R_(p+1) }

Parameters

p	order
u	parameter
Weights	weights
Knots	knots
R	here return basis functions R evaluated at u, that is: R(u)

BasisEvaluateDeriv() [1/2]

static void chrono::ChBasisToolsNurbs::BasisEvaluateDeriv ( const int  p, const double  u, const ChVectorDynamic<> &  Weights, const ChVectorDynamic<> &  Knots, ChVectorDynamic<> &  R, ChVectorDynamic<> &  dRdu  )

inlinestatic

Compute vector of bases R and their first derivatives.

Evaluate ALL the p+1 nonzero basis functions R of a 1D(line) NURBS, at the i-th knot span, given the parameter u, the order p, the knot vector Knots, the weights Weights Results go into the row vector R = { R1, R2, R3, , .... R_(p+1) } and into the row vector dR/du = { dR1/du, dR2/du, dR3/du, .... dR_(p+1)/du }

Parameters

p	order
u	parameter
Weights	weights
Knots	knots
R	here return basis functions R evaluated at u, that is: R(u)
dRdu	here return basis functions derivatives dR/du evaluated at u

BasisEvaluateDeriv() [2/2]

static void chrono::ChBasisToolsNurbs::BasisEvaluateDeriv ( const int  p, const double  u, const ChVectorDynamic<> &  Weights, const ChVectorDynamic<> &  Knots, ChVectorDynamic<> &  R, ChVectorDynamic<> &  dRdu, ChVectorDynamic<> &  ddRddu  )

inlinestatic

Compute vector of bases R and their first and second derivatives.

Evaluate ALL the p+1 nonzero basis functions R of a 1D(line) NURBS, at the i-th knot span, given the parameter u, the order p, the knot vector Knots, the weights Weights Results go into the row vector R = { R1, R2, R3, , .... R_(p+1) } and into the row vector dR/du = { dR1/du, dR2/du, dR3/du, .... dR_(p+1)/du } and into the row vector ddR/ddu={ ddR1/ddu, ddR2/ddu, ddR3/ddu, .... ddR_(p+1)/ddu }

Parameters

p	order
u	parameter
Weights	weights
Knots	knots
R	here return basis functions R evaluated at u, that is: R(u)
dRdu	here return basis functions derivatives dR/du evaluated at u
ddRddu	here return basis functions derivatives ddR/ddu evaluated at u

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The documentation for this class was generated from the following file:

• /builds/uwsbel/chrono/src/chrono/geometry/ChBasisToolsNurbs.h