Panda3D
physxTriangleMeshDesc.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 physxTriangleMeshDesc.cxx
10  * @author enn0x
11  * @date 2009-10-11
12  */
13 
14 #include "physxTriangleMeshDesc.h"
15 #include "physxManager.h"
16 
17 #include "nodePathCollection.h"
18 #include "geomNode.h"
19 #include "geomVertexReader.h"
20 
21 /**
22  * Sets the number of vertices to be stored within this triangle mesh. The
23  * function allocates memory for the vertices, but it does not set any
24  * vertices.
25  *
26  * This method must be called before any calls to set_vertex are done!
27  */
29 set_num_vertices(unsigned int numVertices) {
30 
31  if (_desc.points) {
32  delete [] _vertices;
33  }
34 
35  _vertices = new NxVec3[numVertices];
36 
37  _desc.numVertices = numVertices;
38  _desc.points = _vertices;
39 }
40 
41 /**
42  * Sets a single vertex. You have to call the function set_num_vertices
43  * before you can call this function.
44  */
46 set_vertex(unsigned int idx, const LPoint3f &vert) {
47 
48  nassertv(_desc.numVertices > idx);
49  _vertices[idx] = PhysxManager::point3_to_nxVec3(vert);
50 }
51 
52 /**
53  * Sets the number of triangles to be stored in this triangle mesh.
54  *
55  * This method must be called before any calls to set_triangle are done!
56  */
58 set_num_triangles(unsigned int numTriangles, bool use_material_indices) {
59 
60  if (_desc.triangles) {
61  delete [] _triangles;
62  }
63 
64  if (_desc.materialIndices) {
65  delete [] _materials;
66  }
67 
68  _triangles = new NxU32[3 * numTriangles];
69 
70  _desc.numTriangles = numTriangles;
71  _desc.triangles = _triangles;
72 
73  if (use_material_indices == true) {
74  _materials = new NxMaterialIndex[numTriangles];
75  _desc.materialIndices = _materials;
76  }
77 }
78 
79 /**
80  * Sets a single triangle, by providing the three indices i1, i2, i3.
81  */
83 set_triangle(unsigned int idx,
84  unsigned int i1, unsigned int i2, unsigned int i3,
85  unsigned int material_index) {
86 
87  nassertv(_desc.numTriangles > idx);
88 
89  if (_desc.materialIndices) {
90  _materials[idx] = (NxMaterialIndex) material_index;
91  }
92 
93  idx = 3 * idx;
94  _triangles[idx] = i1;
95  _triangles[idx + 1] = i2;
96  _triangles[idx + 2] = i3;
97 }
98 
99 /**
100  *
101  */
102 const NxTriangleMeshDesc &PhysxTriangleMeshDesc::
103 get_desc() const {
104 
105  return _desc;
106 }
107 
108 /**
109  * A convenience method to set the mesh data from a NodePath in a single call.
110  * The method iterates over the NodePath geoms and collects data for the
111  * triangle mesh.
112  *
113  * Do not use the following function when using this one: - set_num_vertices -
114  * set_vertex - set_num_triangles - set_triangle
115  */
117 set_from_node_path(const NodePath &np) {
118 
119  pvector<LPoint3f> dataVertices;
120  pvector<int> dataIndices;
121 
122  // Collect data from NodePath
123  NodePathCollection npc = np.find_all_matches( "**/+GeomNode" );
124  for (int i=0; i<npc.get_num_paths(); i++) {
125  NodePath gnp = npc.get_path(i);
126  GeomNode *gnode = DCAST(GeomNode, gnp.node());
127 
128  for (int j=0; j<gnode->get_num_geoms(); j++) {
129  CPT(Geom) geom = gnode->get_geom(j);
130 
131  // Vertices
132  CPT(GeomVertexData) vdata = geom->get_vertex_data();
133  GeomVertexReader reader = GeomVertexReader(vdata, InternalName::get_vertex());
134 
135  while (!reader.is_at_end()) {
136  dataVertices.push_back(reader.get_data3f());
137  }
138 
139  // Indices
140  for (int k=0; k<geom->get_num_primitives(); k++) {
141 
142  CPT(GeomPrimitive) prim = geom->get_primitive(k);
143  prim = prim->decompose();
144 
145  for (int l=0; l<prim->get_num_primitives(); l++) {
146 
147  int s = prim->get_primitive_start(l);
148  int e = prim->get_primitive_end(l);
149 
150  for (int l=s; l<e; l++) {
151  dataIndices.push_back(prim->get_vertex(l));
152  }
153  }
154  }
155  }
156  }
157 
158  // Set descriptor members
159  int i;
160 
161  NxU32 numVertices = dataVertices.size();
162  NxU32 numTriangles = dataIndices.size() / 3;
163 
164  _vertices = new NxVec3[numVertices];
165  _triangles = new NxU32[3 * numTriangles];
166 
167  i = 0;
169  for (vit=dataVertices.begin(); vit!=dataVertices.end(); vit++) {
170  LPoint3f v = *vit;
171 
172  _vertices[i].x = v.get_x();
173  _vertices[i].y = v.get_y();
174  _vertices[i].z = v.get_z();
175  i++;
176  }
177 
178  i = 0;
180  for(iit=dataIndices.begin(); iit!=dataIndices.end(); iit++) {
181  NxU32 idx = *iit;
182 
183  _triangles[i] = idx;
184  i++;
185  }
186 
187  _desc.numVertices = numVertices;
188  _desc.points = _vertices;
189  _desc.numTriangles = numTriangles;
190  _desc.triangles = _triangles;
191 }
A node that holds Geom objects, renderable pieces of geometry.
Definition: geomNode.h:34
get_num_geoms
Returns the number of geoms in the node.
Definition: geomNode.h:71
This is an abstract base class for a family of classes that represent the fundamental geometry primit...
Definition: geomPrimitive.h:56
This defines the actual numeric vertex data stored in a Geom, in the structure defined by a particula...
This object provides a high-level interface for quickly reading a sequence of numeric values from a v...
bool is_at_end() const
Returns true if the reader is currently at the end of the list of vertices, false otherwise.
const LVecBase3f & get_data3f()
Returns the data associated with the read row, expressed as a 3-component value, and advances the rea...
A container for geometry primitives.
Definition: geom.h:54
This is a set of zero or more NodePaths.
get_num_paths
Returns the number of NodePaths in the collection.
get_path
Returns the nth NodePath in the collection.
NodePath is the fundamental system for disambiguating instances, and also provides a higher-level int...
Definition: nodePath.h:159
NodePathCollection find_all_matches(const std::string &path) const
Returns the complete set of all NodePaths that begin with this NodePath and can be extended by path.
Definition: nodePath.cxx:358
PandaNode * node() const
Returns the referenced node of the path.
Definition: nodePath.I:227
static NxVec3 point3_to_nxVec3(const LPoint3f &p)
Converts from LPoint3f to NxVec3.
Definition: physxManager.I:63
void set_vertex(unsigned int idx, const LPoint3f &vert)
Sets a single vertex.
void set_from_node_path(const NodePath &np)
A convenience method to set the mesh data from a NodePath in a single call.
void set_num_vertices(unsigned int n)
Sets the number of vertices to be stored within this triangle mesh.
void set_triangle(unsigned int idx, unsigned int i1, unsigned int i2, unsigned int i3, unsigned int material_index=1)
Sets a single triangle, by providing the three indices i1, i2, i3.
void set_num_triangles(unsigned int n, bool use_material_indices=false)
Sets the number of triangles to be stored in this triangle mesh.
This is our own Panda specialization on the default STL vector.
Definition: pvector.h:42
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.
PANDA 3D SOFTWARE Copyright (c) Carnegie Mellon University.