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nurbsVertex.cxx
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1/**
2 * PANDA 3D SOFTWARE
3 * Copyright (c) Carnegie Mellon University. All rights reserved.
4 *
5 * All use of this software is subject to the terms of the revised BSD
6 * license. You should have received a copy of this license along
7 * with this source code in a file named "LICENSE."
8 *
9 * @file nurbsVertex.cxx
10 * @author drose
11 * @date 2002-12-04
12 */
13
14#include "nurbsVertex.h"
15
16
17/**
18 * Sets an n-dimensional vertex value. This allows definition of a NURBS
19 * surface or curve in a sparse n-dimensional space, typically used for
20 * associating additional properties (like color or joint membership) with
21 * each vertex of a surface.
22 *
23 * The value d is an arbitrary integer value and specifies the dimension of
24 * question for this particular vertex. Any number of dimensions may be
25 * specified, and they need not be consecutive. If a value for a given
26 * dimension is not specified, is it implicitly 0.0.
27 *
28 * The value is implicitly scaled by the homogenous weight value--that is, the
29 * fourth component of the value passed to set_vertex(). This means the
30 * ordinary vertex must be set first, before the extended vertices can be set.
31 */
32 void NurbsVertex::
33 set_extended_vertex(int d, PN_stdfloat value) {
34 _extended[d] = value * _vertex[3];
35}
36
37/**
38 * Returns an n-dimensional vertex value. See set_extended_vertex(). This
39 * returns the value set for the indicated dimension, or 0.0 if nothing has
40 * been set.
41 */
42PN_stdfloat NurbsVertex::
43 get_extended_vertex(int d) const {
44 Extended::const_iterator ei;
45 ei = _extended.find(d);
46 if (ei == _extended.end()) {
47 return 0.0f;
48 }
49 return (*ei).second;
50}
NurbsVertex::set_extended_vertex
void set_extended_vertex(int d, PN_stdfloat value)
Sets an n-dimensional vertex value.
Definition nurbsVertex.cxx:33
NurbsVertex::get_extended_vertex
PN_stdfloat get_extended_vertex(int d) const
Returns an n-dimensional vertex value.
Definition nurbsVertex.cxx:43
nurbsVertex.h
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.