This class is an abstraction for evaluating NURBS surfaces. More...

#include "nurbsSurfaceEvaluator.h"

Inheritance diagram for NurbsSurfaceEvaluator:

Public Types
typedef pvector< LPoint3 >	Vert3Array

typedef epvector< LVecBase4 >	Vert4Array

Public Member Functions
PN_stdfloat	get_extended_vertex (int ui, int vi, int d) const
	Returns an n-dimensional vertex value. More...

int	get_num_u_knots () const

int	get_num_u_segments () const
	Returns the number of piecewise continuous segments in the surface in the U direction. More...

int	get_num_u_vertices () const
	Returns the number of control vertices in the U direction on the surface. More...

int	get_num_v_knots () const

int	get_num_v_segments () const
	Returns the number of piecewise continuous segments in the surface in the V direction. More...

int	get_num_v_vertices () const
	Returns the number of control vertices in the V direction on the surface. More...

PN_stdfloat	get_u_knot (int i) const

int	get_u_order () const

PN_stdfloat	get_v_knot (int i) const

int	get_v_order () const

const LVecBase4 &	get_vertex (int ui, int vi) const
	Returns the nth control vertex of the surface, relative to its indicated coordinate space. More...

LVecBase4	get_vertex (int ui, int vi, const NodePath &rel_to) const
	Returns the nth control vertex of the surface, relative to the given coordinate space. More...

NodePath	get_vertex_space (int ui, int vi, const NodePath &rel_to) const
	Returns the coordinate space of the nth control vertex of the surface, expressed as a NodePath. More...

void	get_vertices (Vert4Array &verts, const NodePath &rel_to) const

void	get_vertices (Vert3Array &verts, const NodePath &rel_to) const

void	normalize_u_knots ()
	Normalizes the knot sequence so that the parametric range of the surface in the U direction is 0 . More...

void	normalize_v_knots ()
	Normalizes the knot sequence so that the parametric range of the surface in the U direction is 0 . More...

void	output (std::ostream &out) const

	PT (NurbsSurfaceResult) evaluate(const NodePath &rel_to

void	reset (int num_u_vertices, int num_v_vertices)
	Resets all the vertices and knots to their default values, and sets the surface up with the indicated number of vertices. More...

void	set_extended_vertex (int ui, int vi, int d, PN_stdfloat value)
	Sets an n-dimensional vertex value. More...

void	set_extended_vertices (int ui, int vi, int d, const PN_stdfloat values[], int num_values)
	Simultaneously sets several extended values in the slots d through (d + num_values - 1) from the num_values elements of the indicated array. More...

void	set_u_knot (int i, PN_stdfloat knot)

void	set_u_order (int u_order)

void	set_v_knot (int i, PN_stdfloat knot)

void	set_v_order (int v_order)

void	set_vertex (int ui, int vi, const LVecBase4 &vertex)
	Sets the nth control vertex of the surface, as a vertex in 4-d homogeneous space. More...

void	set_vertex (int ui, int vi, const LVecBase3 &vertex, PN_stdfloat weight=1.0)
	Sets the nth control vertex of the surface. More...

void	set_vertex_space (int ui, int vi, const NodePath &space)
	Sets the coordinate space of the nth control vertex. More...

void	set_vertex_space (int ui, int vi, const std::string &space)
	Sets the coordinate space of the nth control vertex. More...

Public Member Functions inherited from ReferenceCount
int	get_ref_count () const

WeakReferenceList *	get_weak_list () const
	Returns the WeakReferenceList associated with this ReferenceCount object. More...

bool	has_weak_list () const
	Returns true if this particular ReferenceCount object has a WeakReferenceList created, false otherwise. More...

void	local_object ()
	This function should be called, once, immediately after creating a new instance of some ReferenceCount-derived object on the stack. More...

void	ref () const
	Explicitly increments the reference count. More...

bool	ref_if_nonzero () const
	Atomically increases the reference count of this object if it is not zero. More...

bool	test_ref_count_integrity () const
	Does some easy checks to make sure that the reference count isn't completely bogus. More...

bool	test_ref_count_nonzero () const
	Does some easy checks to make sure that the reference count isn't zero, or completely bogus. More...

virtual bool	unref () const
	Explicitly decrements the reference count. More...

WeakReferenceList *	weak_ref ()
	Adds the indicated PointerToVoid as a weak reference to this object. More...

void	weak_unref ()
	Removes the indicated PointerToVoid as a weak reference to this object. More...

Public Attributes
	get_num_u_knots
	Returns the number of knot values in the surface in the U direction. More...

	get_num_v_knots
	Returns the number of knot values in the surface in the V direction. More...

	get_u_knot
	Returns the value of the nth knot. More...

	get_u_order
	Returns the order of the surface in the U direction as set by a previous call to set_u_order(). More...

	get_v_knot
	Returns the value of the nth knot. More...

	get_v_order
	Returns the order of the surface in the V direction as set by a previous call to set_v_order(). More...

	set_u_knot
	Sets the value of the nth knot. More...

	set_u_order
	Sets the order of the surface in the U direction. More...

	set_v_knot
	Sets the value of the nth knot. More...

	set_v_order
	Sets the order of the surface in the V direction. More...

Public Attributes inherited from ReferenceCount
	get_ref_count
	Returns the current reference count. More...

Additional Inherited Members
Static Public Member Functions inherited from ReferenceCount
static TypeHandle	get_class_type ()

static void	init_type ()

Detailed Description

This class is an abstraction for evaluating NURBS surfaces.

It accepts an array of vertices, each of which may be in a different coordinate space (as defined by a NodePath), as well as an optional knot vector.

Definition at line 34 of file nurbsSurfaceEvaluator.h.

Member Function Documentation

◆ get_extended_vertex()

PN_stdfloat NurbsSurfaceEvaluator::get_extended_vertex	(	int	ui,
		int	vi,
		int	d
	)		const

inline

Returns an n-dimensional vertex value.

See set_extended_vertex(). This returns the value set for the indicated dimension, or 0.0 if nothing has been set.

Definition at line 192 of file nurbsSurfaceEvaluator.I.

◆ get_num_u_segments()

int NurbsSurfaceEvaluator::get_num_u_segments ( ) const

inline

Returns the number of piecewise continuous segments in the surface in the U direction.

This is based on the knot vector.

Definition at line 221 of file nurbsSurfaceEvaluator.I.

References NurbsBasisVector::get_num_segments().

◆ get_num_u_vertices()

int NurbsSurfaceEvaluator::get_num_u_vertices ( ) const

inline

Returns the number of control vertices in the U direction on the surface.

This is the number passed to the last call to reset().

Definition at line 65 of file nurbsSurfaceEvaluator.I.

◆ get_num_v_segments()

int NurbsSurfaceEvaluator::get_num_v_segments ( ) const

inline

Returns the number of piecewise continuous segments in the surface in the V direction.

This is based on the knot vector.

Definition at line 233 of file nurbsSurfaceEvaluator.I.

References NurbsBasisVector::get_num_segments().

◆ get_num_v_vertices()

int NurbsSurfaceEvaluator::get_num_v_vertices ( ) const

inline

Returns the number of control vertices in the V direction on the surface.

This is the number passed to the last call to reset().

Definition at line 74 of file nurbsSurfaceEvaluator.I.

◆ get_vertex() [1/2]

const LVecBase4 & NurbsSurfaceEvaluator::get_vertex	(	int	ui,
		int	vi
	)		const

inline

Returns the nth control vertex of the surface, relative to its indicated coordinate space.

Definition at line 108 of file nurbsSurfaceEvaluator.I.

◆ get_vertex() [2/2]

LVecBase4 NurbsSurfaceEvaluator::get_vertex	(	int	ui,
		int	vi,
		const NodePath &	rel_to
	)		const

inline

Returns the nth control vertex of the surface, relative to the given coordinate space.

Definition at line 119 of file nurbsSurfaceEvaluator.I.

◆ get_vertex_space()

NodePath NurbsSurfaceEvaluator::get_vertex_space	(	int	ui,
		int	vi,
		const NodePath &	rel_to
	)		const

Returns the coordinate space of the nth control vertex of the surface, expressed as a NodePath.

Definition at line 63 of file nurbsSurfaceEvaluator.cxx.

◆ normalize_u_knots()

void NurbsSurfaceEvaluator::normalize_u_knots ( )

Normalizes the knot sequence so that the parametric range of the surface in the U direction is 0 .

. 1.

Definition at line 121 of file nurbsSurfaceEvaluator.cxx.

◆ normalize_v_knots()

void NurbsSurfaceEvaluator::normalize_v_knots ( )

Normalizes the knot sequence so that the parametric range of the surface in the U direction is 0 .

. 1.

Definition at line 169 of file nurbsSurfaceEvaluator.cxx.

◆ reset()

void NurbsSurfaceEvaluator::reset	(	int	num_u_vertices,
		int	num_v_vertices
	)

Resets all the vertices and knots to their default values, and sets the surface up with the indicated number of vertices.

You must then call set_vertex() repeatedly to fill in all of the vertex values appropriately.

Definition at line 42 of file nurbsSurfaceEvaluator.cxx.

◆ set_extended_vertex()

void NurbsSurfaceEvaluator::set_extended_vertex	(	int	ui,
		int	vi,
		int	d,
		PN_stdfloat	value
	)

inline

Sets an n-dimensional vertex value.

This allows definition of a NURBS surface or surface in a sparse n-dimensional space, typically used for associating additional properties (like color or joint membership) with each vertex of a surface.

The value d is an arbitrary integer value and specifies the dimension of question for this particular vertex. Any number of dimensions may be specified, and they need not be consecutive. If a value for a given dimension is not specified, is it implicitly 0.0.

The value is implicitly scaled by the homogenous weight value–that is, the fourth component of the value passed to set_vertex(). This means the ordinary vertex must be set first, before the extended vertices can be set.

Definition at line 180 of file nurbsSurfaceEvaluator.I.

◆ set_extended_vertices()

void NurbsSurfaceEvaluator::set_extended_vertices	(	int	ui,
		int	vi,
		int	d,
		const PN_stdfloat	values[],
		int	num_values
	)

Simultaneously sets several extended values in the slots d through (d + num_values - 1) from the num_values elements of the indicated array.

This is equivalent to calling set_extended_vertex() num_values times. See set_extended_vertex().

Definition at line 79 of file nurbsSurfaceEvaluator.cxx.

◆ set_vertex() [1/2]

void NurbsSurfaceEvaluator::set_vertex	(	int	ui,
		int	vi,
		const LVecBase4 &	vertex
	)

inline

Sets the nth control vertex of the surface, as a vertex in 4-d homogeneous space.

In this form, the first three components of the vertex should already have been scaled by the fourth component, which is the homogeneous weight.

Definition at line 85 of file nurbsSurfaceEvaluator.I.

◆ set_vertex() [2/2]

void NurbsSurfaceEvaluator::set_vertex	(	int	ui,
		int	vi,
		const LVecBase3 &	vertex,
		PN_stdfloat	weight = `1.0`
	)

inline

Sets the nth control vertex of the surface.

This flavor sets the vertex as a 3-d coordinate and a weight; the 3-d coordinate values are implicitly scaled up by the weight factor.

Definition at line 97 of file nurbsSurfaceEvaluator.I.

◆ set_vertex_space() [1/2]

void NurbsSurfaceEvaluator::set_vertex_space	(	int	ui,
		int	vi,
		const NodePath &	space
	)

inline

Sets the coordinate space of the nth control vertex.

If this is not specified, or is set to an empty NodePath, the nth control vertex is deemed to be in the coordinate space passed to evaluate().

This specifies the space as a fixed NodePath, which is always the same NodePath. Also see setting the space as a path string, which can specify a different NodePath for different instances of the surface.

Definition at line 143 of file nurbsSurfaceEvaluator.I.

◆ set_vertex_space() [2/2]

void NurbsSurfaceEvaluator::set_vertex_space	(	int	ui,
		int	vi,
		const std::string &	space
	)

inline

Sets the coordinate space of the nth control vertex.

If this is not specified, or is set to an empty string, the nth control vertex is deemed to be in the coordinate space passed to evaluate().

This specifies the space as a string, which describes the path to find the node relative to the rel_to NodePath when the surface is evaluated.

Definition at line 158 of file nurbsSurfaceEvaluator.I.

Member Data Documentation

◆ get_num_u_knots

int NurbsSurfaceEvaluator::get_num_u_knots

inline

Returns the number of knot values in the surface in the U direction.

This is based on the number of vertices and the order.

Definition at line 66 of file nurbsSurfaceEvaluator.h.

◆ get_num_v_knots

int NurbsSurfaceEvaluator::get_num_v_knots

inline

Returns the number of knot values in the surface in the V direction.

This is based on the number of vertices and the order.

Definition at line 72 of file nurbsSurfaceEvaluator.h.

◆ get_u_knot

PN_stdfloat NurbsSurfaceEvaluator::get_u_knot

Returns the value of the nth knot.

Definition at line 66 of file nurbsSurfaceEvaluator.h.

◆ get_u_order

int NurbsSurfaceEvaluator::get_u_order

inline

Returns the order of the surface in the U direction as set by a previous call to set_u_order().

Definition at line 82 of file nurbsSurfaceEvaluator.h.

◆ get_v_knot

PN_stdfloat NurbsSurfaceEvaluator::get_v_knot

Returns the value of the nth knot.

Definition at line 72 of file nurbsSurfaceEvaluator.h.

◆ get_v_order

int NurbsSurfaceEvaluator::get_v_order

inline

Returns the order of the surface in the V direction as set by a previous call to set_v_order().

Definition at line 83 of file nurbsSurfaceEvaluator.h.

◆ set_u_knot

void NurbsSurfaceEvaluator::set_u_knot

Sets the value of the nth knot.

Each knot value should be greater than or equal to the preceding value. If no knot values are set, a default knot vector is supplied.

Definition at line 84 of file nurbsSurfaceEvaluator.h.

◆ set_u_order

void NurbsSurfaceEvaluator::set_u_order

inline

Sets the order of the surface in the U direction.

This resets the knot vector to the default knot vector for the number of vertices.

The order must be 1, 2, 3, or 4, and the value is one more than the degree of the surface.

Definition at line 82 of file nurbsSurfaceEvaluator.h.

◆ set_v_knot

void NurbsSurfaceEvaluator::set_v_knot

Sets the value of the nth knot.

Each knot value should be greater than or equal to the preceding value. If no knot values are set, a default knot vector is supplied.

Definition at line 85 of file nurbsSurfaceEvaluator.h.

◆ set_v_order

void NurbsSurfaceEvaluator::set_v_order

inline

Sets the order of the surface in the V direction.

This resets the knot vector to the default knot vector for the number of vertices.

The order must be 1, 2, 3, or 4, and the value is one more than the degree of the surface.

Definition at line 83 of file nurbsSurfaceEvaluator.h.

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

panda/src/parametrics/nurbsSurfaceEvaluator.h
panda/src/parametrics/nurbsSurfaceEvaluator.cxx
panda/src/parametrics/nurbsSurfaceEvaluator.I

Public Types

Public Member Functions

Public Attributes

Additional Inherited Members

Detailed Description

Member Function Documentation

◆ get_extended_vertex()

◆ get_num_u_segments()

◆ get_num_u_vertices()

◆ get_num_v_segments()

◆ get_num_v_vertices()

◆ get_vertex() [1/2]

◆ get_vertex() [2/2]

◆ get_vertex_space()

◆ normalize_u_knots()

◆ normalize_v_knots()

◆ reset()

◆ set_extended_vertex()

◆ set_extended_vertices()

◆ set_vertex() [1/2]

◆ set_vertex() [2/2]

◆ set_vertex_space() [1/2]

◆ set_vertex_space() [2/2]

Member Data Documentation

◆ get_num_u_knots

◆ get_num_v_knots

◆ get_u_knot

◆ get_u_order

◆ get_v_knot

◆ get_v_order

◆ set_u_knot

◆ set_u_order

◆ set_v_knot

◆ set_v_order