This class is an abstraction for evaluating NURBS curves. More...
#include "nurbsCurveEvaluator.h"
Public Types | |
| typedef pvector< LPoint3 > | Vert3Array |
| typedef epvector< LVecBase4 > | Vert4Array |
Public Member Functions | |
| PN_stdfloat | get_extended_vertex (int i, int d) const |
| Returns an n-dimensional vertex value. More... | |
| PN_stdfloat | get_knot (int i) const |
| int | get_num_knots () const |
| int | get_num_segments () const |
| Returns the number of piecewise continuous segments in the curve. More... | |
| int | get_num_vertices () const |
| int | get_order () const |
| Returns the order of the curve as set by a previous call to set_order(). More... | |
| const LVecBase4 & | get_vertex (int i) const |
| LVecBase4 | get_vertex (int i, const NodePath &rel_to) const |
| NodePath | get_vertex_space (int i, const NodePath &rel_to) const |
| Returns the coordinate space of the nth control vertex of the curve, 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_knots () |
| Normalizes the knot sequence so that the parametric range of the curve is 0 More... | |
| void | output (std::ostream &out) const |
| PT (NurbsCurveResult) evaluate(const NodePath &rel_to | |
| PT (NurbsCurveResult) evaluate(const NodePath &rel_to | |
| void | reset (int num_vertices) |
| Resets all the vertices and knots to their default values, and sets the curve up with the indicated number of vertices. More... | |
| void | set_extended_vertex (int i, int d, PN_stdfloat value) |
| Sets an n-dimensional vertex value. More... | |
| void | set_extended_vertices (int i, 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_knot (int i, PN_stdfloat knot) |
| Sets the value of the nth knot. More... | |
| void | set_order (int order) |
| Sets the order of the curve. More... | |
| void | set_vertex (int i, const LVecBase4 &vertex) |
| Sets the nth control vertex of the curve, as a vertex in 4-d homogeneous space. More... | |
| void | set_vertex (int i, const LVecBase3 &vertex, PN_stdfloat weight=1.0) |
| Sets the nth control vertex of the curve. More... | |
| void | set_vertex_space (int i, const NodePath &space) |
| Sets the coordinate space of the nth control vertex. More... | |
| void | set_vertex_space (int i, 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 | |
| const LMatrix4 &mat | const |
| get_knot | |
| Returns the value of the nth knot. More... | |
| get_num_knots | |
| Returns the number of knot values in the curve. More... | |
| get_num_vertices | |
| Returns the number of control vertices in the curve. More... | |
| get_vertex | |
| Returns the nth control vertex of the curve, relative to its indicated coordinate space. 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 curves.
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.
This is not related to NurbsCurve, CubicCurveseg or any of the ParametricCurve-derived objects in this module. It is a completely parallel implementation of NURBS curves, and will probably eventually replace the whole ParametricCurve class hierarchy.
Definition at line 39 of file nurbsCurveEvaluator.h.
Member Function Documentation
◆ get_extended_vertex()
|
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 152 of file nurbsCurveEvaluator.I.
◆ get_num_segments()
|
inline |
Returns the number of piecewise continuous segments in the curve.
This is based on the knot vector.
Definition at line 171 of file nurbsCurveEvaluator.I.
References NurbsBasisVector::get_num_segments().
◆ get_order()
|
inline |
Returns the order of the curve as set by a previous call to set_order().
Definition at line 32 of file nurbsCurveEvaluator.I.
◆ get_vertex_space()
Returns the coordinate space of the nth control vertex of the curve, expressed as a NodePath.
Definition at line 55 of file nurbsCurveEvaluator.cxx.
◆ normalize_knots()
| void NurbsCurveEvaluator::normalize_knots | ( | ) |
Normalizes the knot sequence so that the parametric range of the curve is 0
. 1.
Definition at line 110 of file nurbsCurveEvaluator.cxx.
References get_num_vertices.
◆ reset()
| void NurbsCurveEvaluator::reset | ( | int | num_vertices | ) |
Resets all the vertices and knots to their default values, and sets the curve 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 39 of file nurbsCurveEvaluator.cxx.
◆ set_extended_vertex()
|
inline |
Sets an n-dimensional vertex value.
This allows definition of a NURBS surface or curve 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 141 of file nurbsCurveEvaluator.I.
◆ set_extended_vertices()
| void NurbsCurveEvaluator::set_extended_vertices | ( | int | i, |
| 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 70 of file nurbsCurveEvaluator.cxx.
◆ set_knot()
| void NurbsCurveEvaluator::set_knot | ( | int | i, |
| PN_stdfloat | 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 nurbsCurveEvaluator.cxx.
◆ set_order()
|
inline |
Sets the order of the curve.
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 curve.
Definition at line 22 of file nurbsCurveEvaluator.I.
◆ set_vertex() [1/2]
|
inline |
Sets the nth control vertex of the curve, 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 52 of file nurbsCurveEvaluator.I.
◆ set_vertex() [2/2]
|
inline |
Sets the nth control vertex of the curve.
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 63 of file nurbsCurveEvaluator.I.
◆ set_vertex_space() [1/2]
|
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 curve.
Definition at line 106 of file nurbsCurveEvaluator.I.
◆ set_vertex_space() [2/2]
|
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 curve is evaluated.
Definition at line 120 of file nurbsCurveEvaluator.I.
Member Data Documentation
◆ get_knot
| PN_stdfloat NurbsCurveEvaluator::get_knot |
Returns the value of the nth knot.
Definition at line 68 of file nurbsCurveEvaluator.h.
◆ get_num_knots
|
inline |
Returns the number of knot values in the curve.
This is based on the number of vertices and the order.
Definition at line 68 of file nurbsCurveEvaluator.h.
◆ get_num_vertices
|
inline |
Returns the number of control vertices in the curve.
This is the number passed to the last call to reset().
Definition at line 54 of file nurbsCurveEvaluator.h.
Referenced by normalize_knots().
◆ get_vertex
|
inline |
Returns the nth control vertex of the curve, relative to its indicated coordinate space.
Returns the nth control vertex of the curve, relative to the given coordinate space.
Definition at line 54 of file nurbsCurveEvaluator.h.
The documentation for this class was generated from the following files:
- panda/src/parametrics/nurbsCurveEvaluator.h
- panda/src/parametrics/nurbsCurveEvaluator.cxx
- panda/src/parametrics/nurbsCurveEvaluator.I
