A nurbs surface value. More...

#include <NurbsSurface.h>

Inheritance diagram for maquina::NurbsSurface:

Public Types
enum	Mode { Open = 0, Closed = 1, Periodic = 2 }
	The surface curves mode. More...

Public Types inherited from maquina::Shape
enum	Topology { constant =0, vertex, face, face_varying }
	The different attribute topologies. More...

Public Member Functions
	NurbsSurface ()
	Create an empty surface. More...

	NurbsSurface (const Value &v)
	Cast a Value in NurbsSurface. More...

	NurbsSurface (const gsl::span< const NurbsCurve > &curves, int degree_v, Mode mode, bool use_u_direction, bool uniform)
	Build a nurbs surface using nurbs curves (loft) More...

	NurbsSurface (const gsl::span< const NurbsCurve > &curves, const gsl::span< const float > &parameters, int degree_v, Mode mode, bool use_u_direction)
	Build a nurbs surface using nurbs curves (loft) More...

	NurbsSurface (const BufferConstV3f &points, const BufferConstFloat &knots_u, const BufferConstFloat &knots_v, int degree_u, int degree_v, Mode mode_u, Mode mode_v)
	Build a surface. More...

const BufferConstFloat	read_knots_u () const
	Return the readable surface knots in u. More...

BufferFloat	write_knots_u ()
	Return the writable surface knots in u. More...

const BufferConstFloat	read_knots_v () const
	Return the readable surface knots in v. More...

BufferFloat	write_knots_v ()
	Return the writable surface knots in v. More...

int	control_points_u () const
	Return the number of control points in u. More...

int	control_points_v () const
	Return the number of control points in v. More...

int	degree_u () const
	Return the surface degree in u. More...

int	degree_v () const
	Return the surface degree in v. More...

Mode	mode_u () const
	Return the surface degree in u. More...

Mode	mode_v () const
	Return the surface degree in v. More...

int	span_u () const
	Return the number of span in u. More...

int	span_v () const
	Return the number of span in v. More...

Imath::V2f	range_u () const
	Return the u parameter range. More...

void	set_range_u (const Imath::V2f &r)
	Set the u parameter range. More...

Imath::V2f	range_v () const
	Return the v parameter range. More...

void	set_range_v (const Imath::V2f &r)
	Set the v parameter range. More...

Imath::V3f	control_point (int u, int v) const
	Return a single control point. More...

Imath::V3f	evaluate (float u, float v) const
	Evaluate the surface at a uv coordinate. More...

Imath::V3d	evaluate (double u, double v) const
	Evaluate the surface at a uv coordinate in double precision. More...

NurbsCurve	iso_curve (float u, bool use_v) const
	Extract an iso curve from the surface. More...

std::pair< Imath::V3f, Imath::V3f >	evaluate_dp (float u, float v, bool previous_u=false, bool previous_v=false) const
	Evaluate the surface position derivatives at a uv coordinate. More...

Imath::V2f	closest (const Imath::V3f &p, Imath::V3f *r=nullptr, float error=0.001f, int max_try=10) const
	Compute the surface closest point to p. More...

Mesh	tessellate (int subdivision_u, int subdivision_v, bool compute_uv_and_normals=false) const
	Return a mesh out of the nurbs surface, with the uv and normals if requested. More...

void	remap_knots_u (float new_min, float new_max)
	Remap the U knots between new_min and float new_max. More...

void	remap_knots_v (float new_min, float new_max)
	Remap the V knots between new_min and float new_max. More...

void	swap_u_v ()
	Swap the u and v surface parameter. More...

void	refine_knots_v (const gsl::span< const float > &new_knots)
	Refine the v knots by inserting the new knots. More...

Public Member Functions inherited from maquina::Points
	Points ()
	Create an empty. More...

	Points (const Value &v)
	Cast a Value in Points. More...

BufferV3f	write_points ()
	Return the points buffer. More...

const BufferConstV3f	read_points () const
	Return the points buffer. More...

size_t	point_count () const
	Return the number of points. More...

Imath::Box3f	bounding_box () const
	Compute the object points bounding box. More...

void	compute_vertex_normals (BufferV3f &result) const
	Compute and return the vertex normals. More...

Public Member Functions inherited from maquina::Shape
	Shape ()

	Shape (const Value &v)
	Cast a Value object in Shape. More...

bool	has_attribute (const char *attribute_name, Topology topology) const
	Test if the shape has this attribute. More...

template<typename T >
T	write_attribute (const char *attribute_name, Topology topology)
	Get a write access to an attribute. More...

const Value	read_attribute (const char *attribute_name, Topology topology) const
	Get a read access to an attribute. More...

bool	set_attribute (const char *name, Topology topology, const Value &value)
	Set an attribute. More...

bool	remove_attribute (const char *name, Topology topology)
	Remove an attribute. More...

void	finalize ()
	Finalize the shape after deformation. More...

size_t	topology_size (Topology topology) const
	Get the number of faces, edges or vertices. More...

Attributes	read_attributes () const
	Return a read-only attribute iteration. More...

Public Member Functions inherited from maquina::Value
	Value ()

	Value (Value &&other)=default

	Value (const Value &other)=default

Value &	operator= (Value &&other)=default

Value &	operator= (const Value &other)=default

virtual	~Value ()=default

Value	duplicate () const
	Duplicate the value. More...

bool	as_bool () const
	Returns the value as a bool. More...

int	as_int () const
	Returns the value as an integer. More...

float	as_float () const
	Returns the value as a float. More...

double	as_double () const
	Returns the value as a double. More...

const std::string &	as_string () const
	Returns the value as a string. More...

std::wstring	as_wstring () const
	Returns the value as a wstring. More...

Imath::V2f	as_V2f () const
	Returns the value as a V2f. More...

Imath::V3f	as_V3f () const
	Returns the value as a V3f. More...

Imath::V4f	as_V4f () const
	Returns the value as a V4f. More...

const Imath::V2d &	as_V2d () const
	Returns the value as a V2d. More...

const Imath::V3d &	as_V3d () const
	Returns the value as a V3d. More...

const Imath::V4d &	as_V4d () const
	Returns the value as a V4d. More...

const Imath::V2i &	as_V2i () const
	Returns the value as a V2i. More...

const Imath::V3i &	as_V3i () const
	Returns the value as a V3i. More...

const Imath::V4i &	as_V4i () const
	Returns the value as a V4i. More...

Imath::M44f	as_M44f () const
	Returns the value as a M44f. More...

const Imath::M44d &	as_M44d () const
	Returns the value as a M44d. More...

const Imath::Box3f &	as_Box3f () const
	Returns the value as a Box3f. More...

const Imath::Color4f &	as_Color4f () const
	Returns the value as a Color4f. More...

Imath::Quatf	as_Quatf () const
	Returns the value as a Quatf. More...

const Imath::Quatd &	as_Quatd () const
	Returns the value as a Quatd. More...

std::shared_ptr< const UserData >	as_user_data () const
	Returns the value as a user data. More...

StringView	type_name () const
	Return the type name of the Value. More...

virtual bool	has_node_delegate () const
	Check if this value can produces a NodeDelegate. More...

virtual std::shared_ptr< NodeDelegate >	node_delegate (const std::shared_ptr< NodeDelegate > &parent, const StringView &name) const

bool	operator== (const Value &o) const
	Compare the two values. More...

bool	operator!= (const Value &o) const

bool	is_instance (const char *value_type_name) const
	Check if this type derives from another value type. More...

	operator bool () const

	Value (bool)
	Create a boolean value. More...

	Value (int)
	Create an integer value. More...

	Value (float)
	Create a float value. More...

	Value (double)
	Create a double value (stored in a float right now) More...

	Value (const char *string)
	Create a string value. More...

	Value (const wchar_t *string)
	Create a string value. More...

	Value (const std::string &string)
	Create a string value. More...

	Value (const std::wstring &string)
	Create a wide string value. More...

	Value (const Imath::V2f &)
	Create a Imath::V2f value. More...

	Value (const Imath::V3f &)
	Create a Imath::V3f value. More...

	Value (const Imath::V4f &)
	Create a Imath::V4f value. More...

	Value (const Imath::V2d &)
	Create a Imath::V2d value. More...

	Value (const Imath::V3d &)
	Create a Imath::V3d value. More...

	Value (const Imath::V4d &)
	Create a Imath::V4d value. More...

	Value (const Imath::V2i &)
	Create a Imath::V2i value. More...

	Value (const Imath::V3i &)
	Create a Imath::V3i value. More...

	Value (const Imath::V4i &)
	Create a Imath::V4i value. More...

	Value (const Imath::Color4f &)
	Create a Imath::Color4f value. More...

	Value (const Imath::M44f &)
	Create a Imath::M44f value. More...

	Value (const Imath::M44d &)
	Create a Imath::M44d value. More...

	Value (const Imath::Box3f &)
	Create a Imath::Box3f value. More...

	Value (const Imath::Quatf &)
	Create a Imath::Quatf value. More...

	Value (const Imath::Quatd &)
	Create a Imath::Quatd value. More...

	Value (const std::shared_ptr< const UserData > &user_data)
	Create a user data value. More...

Static Public Member Functions
static NurbsSurface	fit_open (const gsl::span< const Imath::V3f > &points, const gsl::span< const float > &parameters_u, const gsl::span< const float > &parameters_v, const gsl::span< const float > &knots_u, const gsl::span< const float > &knots_v, int pu, int pv, int du, int dv)
	Fit the surface over a grid of points. More...

static NurbsSurface	fit_close_u (const gsl::span< const Imath::V3f > &points, const gsl::span< const float > &parameters_u, const gsl::span< const float > &parameters_v, const gsl::span< const float > &knots_u, const gsl::span< const float > &knots_v, int pu, int pv, int du, int dv)
	Fit the surface over a grid of points closed in the U direction. 'du' points in the U direction must be wraped (copy of the 'du' first points). More...

static NurbsSurface	fit_close_v (const gsl::span< const Imath::V3f > &points, const gsl::span< const float > &parameters_u, const gsl::span< const float > &parameters_v, const gsl::span< const float > &knots_u, const gsl::span< const float > &knots_v, int pu, int pv, int du, int dv)
	Fit the surface over a grid of points closed in the V direction. 'dv' points in the V direction must be wraped (copy of the 'dv' first points). More...

Static Public Member Functions inherited from maquina::Value
static bool	validate_type_name (const char *type_name)
	Return true if the name is a valid type name. More...

static Value	get_default_value (const char *type_name)
	Return a default value for a given type. More...

Static Public Attributes
static const NurbsSurface	default_value
	The default value. More...

Static Public Attributes inherited from maquina::Points
static const Points	default_value
	The default value. More...

Static Public Attributes inherited from maquina::Value
static const Value	default_value
	The default value. More...

Detailed Description

A nurbs surface value.

This object is a standard nurbs surface. The control points are stored in u order first

Member Enumeration Documentation

◆ Mode

enum maquina::NurbsSurface::Mode

The surface curves mode.

Enumerator
Open	The surface is open.
Closed	The surface is closed, the first and last vertices should stay the same.
Periodic	The surface is periodic, the N-degree first vertices should be the same as the N-degree last ones.

Constructor & Destructor Documentation

◆ NurbsSurface() [1/5]

maquina::NurbsSurface::NurbsSurface ( )

Create an empty surface.

◆ NurbsSurface() [2/5]

maquina::NurbsSurface::NurbsSurface ( const Value & v )

Cast a Value in NurbsSurface.

If v is not a NurbsSurface object, this object will be an empty nurbs surface.

◆ NurbsSurface() [3/5]

maquina::NurbsSurface::NurbsSurface	(	const gsl::span< const NurbsCurve > &	curves,
		int	degree_v,
		Mode	mode,
		bool	use_u_direction,
		bool	uniform
	)

Build a nurbs surface using nurbs curves (loft)

The curve must have the same degree and the same knots.

Parameters

curves	The curves to use to loft the surface
degree_v	The degree of the second dimension
mode	The mode of the second dimension
use_u_direction	If true, loft in the u direction
uniform	If true, use an uniform parametrization, if false, use a chord length paramatrization

◆ NurbsSurface() [4/5]

maquina::NurbsSurface::NurbsSurface	(	const gsl::span< const NurbsCurve > &	curves,
		const gsl::span< const float > &	parameters,
		int	degree_v,
		Mode	mode,
		bool	use_u_direction
	)

Build a nurbs surface using nurbs curves (loft)

The curve must have the same degree and the same knots.

Parameters

curves	The curves to use to loft the surface
parameters	The parameters of each curve in the final surface. Same size than curves.
degree_v	The degree of the second dimension
mode	The mode of the second dimension
use_u_direction	If true, loft in the u direction

◆ NurbsSurface() [5/5]

maquina::NurbsSurface::NurbsSurface	(	const BufferConstV3f &	points,
		const BufferConstFloat &	knots_u,
		const BufferConstFloat &	knots_v,
		int	degree_u,
		int	degree_v,
		Mode	mode_u,
		Mode	mode_v
	)

Build a surface.

Member Function Documentation

◆ closest()

Imath::V2f maquina::NurbsSurface::closest	(	const Imath::V3f &	p,
		Imath::V3f *	r = `nullptr`,
		float	error = `0.001f`,
		int	max_try = `10`
	)		const

Compute the surface closest point to p.

Returns the surface parameters of the closest point.

Parameters

p	The position to project on the surface
r	If not null, it is filled with the closest curve position
error	Stop to iterate when (du < error(u_max-umin) && dv < error(v_max-vmin))
max_try	Maximum number of iterations

◆ control_point()

Imath::V3f maquina::NurbsSurface::control_point	(	int	u,
		int	v
	)		const

Return a single control point.

◆ control_points_u()

int maquina::NurbsSurface::control_points_u ( ) const

Return the number of control points in u.

◆ control_points_v()

int maquina::NurbsSurface::control_points_v ( ) const

Return the number of control points in v.

◆ degree_u()

int maquina::NurbsSurface::degree_u ( ) const

Return the surface degree in u.

◆ degree_v()

int maquina::NurbsSurface::degree_v ( ) const

Return the surface degree in v.

◆ evaluate() [1/2]

Imath::V3f maquina::NurbsSurface::evaluate	(	float	u,
		float	v
	)		const

Evaluate the surface at a uv coordinate.

◆ evaluate() [2/2]

Imath::V3d maquina::NurbsSurface::evaluate	(	double	u,
		double	v
	)		const

Evaluate the surface at a uv coordinate in double precision.

◆ evaluate_dp()

std::pair<Imath::V3f,Imath::V3f> maquina::NurbsSurface::evaluate_dp	(	float	u,
		float	v,
		bool	previous_u = `false`,
		bool	previous_v = `false`
	)		const

Evaluate the surface position derivatives at a uv coordinate.

Return the (dp/du, dp,dv) vectors . They are not normalized.

◆ fit_close_u()

static NurbsSurface maquina::NurbsSurface::fit_close_u	(	const gsl::span< const Imath::V3f > &	points,
		const gsl::span< const float > &	parameters_u,
		const gsl::span< const float > &	parameters_v,
		const gsl::span< const float > &	knots_u,
		const gsl::span< const float > &	knots_v,
		int	pu,
		int	pv,
		int	du,
		int	dv
	)

static

Fit the surface over a grid of points closed in the U direction. 'du' points in the U direction must be wraped (copy of the 'du' first points).

Parameters

points	the grid of points, its size must be pupv. The (u,v) point is at the index u+vpu.
pu	the number of points in u
pv	the number of points in v
du	the degree of the curve in u
dv	the degree of the curve in v

Returns: the nurbs surface

◆ fit_close_v()

static NurbsSurface maquina::NurbsSurface::fit_close_v	(	const gsl::span< const Imath::V3f > &	points,
		const gsl::span< const float > &	parameters_u,
		const gsl::span< const float > &	parameters_v,
		const gsl::span< const float > &	knots_u,
		const gsl::span< const float > &	knots_v,
		int	pu,
		int	pv,
		int	du,
		int	dv
	)

static

Fit the surface over a grid of points closed in the V direction. 'dv' points in the V direction must be wraped (copy of the 'dv' first points).

Parameters

points	the grid of points, its size must be pupv. The (u,v) point is at the index u+vpu.
pu	the number of points in u
pv	the number of points in v
du	the degree of the curve in u
dv	the degree of the curve in v

Returns: the nurbs surface

◆ fit_open()

static NurbsSurface maquina::NurbsSurface::fit_open	(	const gsl::span< const Imath::V3f > &	points,
		const gsl::span< const float > &	parameters_u,
		const gsl::span< const float > &	parameters_v,
		const gsl::span< const float > &	knots_u,
		const gsl::span< const float > &	knots_v,
		int	pu,
		int	pv,
		int	du,
		int	dv
	)

static

Fit the surface over a grid of points.

Parameters

points	the grid of points, its size must be pupv. The (u,v) point is at the index u+vpu.
pu	the number of points in u
pv	the number of points in v
du	the degree of the curve in u
dv	the degree of the curve in v

Returns: the nurbs surface

◆ iso_curve()

NurbsCurve maquina::NurbsSurface::iso_curve	(	float	u,
		bool	use_v
	)		const

Extract an iso curve from the surface.

Extract the curve at the u parameter. If use_v is true, extact the curve in the V direction, else in the U direction.

◆ mode_u()

Mode maquina::NurbsSurface::mode_u ( ) const

Return the surface degree in u.

◆ mode_v()

Mode maquina::NurbsSurface::mode_v ( ) const

Return the surface degree in v.

◆ range_u()

Imath::V2f maquina::NurbsSurface::range_u ( ) const

Return the u parameter range.

◆ range_v()

Imath::V2f maquina::NurbsSurface::range_v ( ) const

Return the v parameter range.

◆ read_knots_u()

const BufferConstFloat maquina::NurbsSurface::read_knots_u ( ) const

Return the readable surface knots in u.

◆ read_knots_v()

const BufferConstFloat maquina::NurbsSurface::read_knots_v ( ) const

Return the readable surface knots in v.

◆ refine_knots_v()

void maquina::NurbsSurface::refine_knots_v ( const gsl::span< const float > & new_knots )

Refine the v knots by inserting the new knots.

◆ remap_knots_u()

void maquina::NurbsSurface::remap_knots_u	(	float	new_min,
		float	new_max
	)

Remap the U knots between new_min and float new_max.

◆ remap_knots_v()

void maquina::NurbsSurface::remap_knots_v	(	float	new_min,
		float	new_max
	)

Remap the V knots between new_min and float new_max.

◆ set_range_u()

void maquina::NurbsSurface::set_range_u ( const Imath::V2f & r )

Set the u parameter range.

◆ set_range_v()

void maquina::NurbsSurface::set_range_v ( const Imath::V2f & r )

Set the v parameter range.

◆ span_u()

int maquina::NurbsSurface::span_u ( ) const

Return the number of span in u.

◆ span_v()

int maquina::NurbsSurface::span_v ( ) const

Return the number of span in v.

◆ swap_u_v()

void maquina::NurbsSurface::swap_u_v ( )

Swap the u and v surface parameter.

◆ tessellate()

Mesh maquina::NurbsSurface::tessellate	(	int	subdivision_u,
		int	subdivision_v,
		bool	compute_uv_and_normals = `false`
	)		const

Return a mesh out of the nurbs surface, with the uv and normals if requested.

◆ write_knots_u()

BufferFloat maquina::NurbsSurface::write_knots_u ( )

Return the writable surface knots in u.

◆ write_knots_v()

BufferFloat maquina::NurbsSurface::write_knots_v ( )

Return the writable surface knots in v.

Member Data Documentation

◆ default_value

const NurbsSurface maquina::NurbsSurface::default_value

static

The default value.

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

include/Maquina/NurbsSurface.h

Public Types

Public Member Functions

Static Public Member Functions

Static Public Attributes

Detailed Description

Member Enumeration Documentation

◆ Mode

Constructor & Destructor Documentation

◆ NurbsSurface() [1/5]

◆ NurbsSurface() [2/5]

◆ NurbsSurface() [3/5]

◆ NurbsSurface() [4/5]

◆ NurbsSurface() [5/5]

Member Function Documentation

◆ closest()

◆ control_point()

◆ control_points_u()

◆ control_points_v()

◆ degree_u()

◆ degree_v()

◆ evaluate() [1/2]

◆ evaluate() [2/2]

◆ evaluate_dp()

◆ fit_close_u()

◆ fit_close_v()

◆ fit_open()

◆ iso_curve()

◆ mode_u()

◆ mode_v()

◆ range_u()

◆ range_v()

◆ read_knots_u()

◆ read_knots_v()

◆ refine_knots_v()

◆ remap_knots_u()

◆ remap_knots_v()

◆ set_range_u()

◆ set_range_v()

◆ span_u()

◆ span_v()

◆ swap_u_v()

◆ tessellate()

◆ write_knots_u()

◆ write_knots_v()

Member Data Documentation

◆ default_value