NR Namespace Reference

Classes
struct	Fvector
	a type of 3 gdouble components vectors More...

Functions
void	convert_coord (gdouble &x, gdouble &y, gdouble &z, Geom::Affine const &trans)
gdouble	norm (const Fvector &v)
	returns the euclidean norm of the vector v
void	normalize_vector (Fvector &v)
	Normalizes a vector.
gdouble	scalar_product (const Fvector &a, const Fvector &b)
	Computes the scalar product between two Fvectors.
void	normalized_sum (Fvector &r, const Fvector &a, const Fvector &b)
	Computes the normalized sum of two Fvectors.
static const Fvector	EYE_VECTOR (0, 0, 1)
	The eye vector.
void	convert_coord (double &x, double &y, double &z, Geom::Affine const &trans)
	Applies the transformation matrix to (x, y, z).

Function Documentation

convert_coord() [1/2]

void NR::convert_coord	(	double &	x,
		double &	y,
		double &	z,
		Geom::Affine const &	trans
	)

Applies the transformation matrix to (x, y, z).

This function assumes that trans[0] = trans[3]. x and y are transformed according to trans, z is multiplied by trans[0].

Parameters

x	a reference to a x coordinate
y	a reference to a y coordinate
z	a reference to a z coordinate
z	a reference to a transformation matrix

convert_coord() [2/2]

void NR::convert_coord	(	gdouble &	x,
		gdouble &	y,
		gdouble &	z,
		Geom::Affine const &	trans
	)

Definition at line 22 of file nr-3dutils.cpp.

References Geom::X, and Geom::Y.

Referenced by Inkscape::Filters::PointLight::PointLight(), and Inkscape::Filters::SpotLight::SpotLight().

EYE_VECTOR()

static const Fvector NR::EYE_VECTOR ( 0  , 0  , 1    )

static

The eye vector.

norm()

double NR::norm

(

const Fvector &

v

)

returns the euclidean norm of the vector v

Parameters

v	a reference to a vector with double components

Returns

the euclidean norm of v

Definition at line 30 of file nr-3dutils.cpp.

Referenced by normalize_vector().

normalize_vector()

void NR::normalize_vector

(

Fvector &

v

)

Normalizes a vector.

Parameters

v	a reference to a vector to normalize

Definition at line 34 of file nr-3dutils.cpp.

References norm().

Referenced by Inkscape::Filters::PointLight::light_vector(), Inkscape::Filters::SpotLight::light_vector(), normalized_sum(), Inkscape::Filters::SpotLight::SpotLight(), and SurfaceSynth::surfaceNormalAt().

normalized_sum()

void NR::normalized_sum	(	Fvector &	r,
		const Fvector &	a,
		const Fvector &	b
	)

Computes the normalized sum of two Fvectors.

Parameters

r	a Fvector reference where we store the result
a	a Fvector reference
b	a Fvector reference

Definition at line 48 of file nr-3dutils.cpp.

References normalize_vector().

scalar_product()

double NR::scalar_product	(	const Fvector &	a,
		const Fvector &	b
	)

Computes the scalar product between two Fvectors.

Parameters

a	a Fvector reference
b	a Fvector reference

Returns

the scalar product of a and b

Definition at line 42 of file nr-3dutils.cpp.

Referenced by Inkscape::Filters::SpotLight::light_components().