Examples/Tutorial/08coresdemo1.cpp

   1 // all needed include files
   2 #ifdef OSG_BUILD_ACTIVE
   3 #include <OSGGLUT.h>
   4 #include <OSGConfig.h>
   5 #include <OSGSimpleGeometry.h>
   6 #include <OSGGLUTWindow.h>
   7 #include <OSGSimpleSceneManager.h>
   8
   9 //additional headder files
  10 #include <OSGSceneFileHandler.h>
  11 #include <OSGDistanceLOD.h>
  12 #include <OSGSwitch.h>
  13 #include <OSGNameAttachment.h>
  14 #else
  15 #include <OpenSG/OSGGLUT.h>
  16 #include <OpenSG/OSGConfig.h>
  17 #include <OpenSG/OSGSimpleGeometry.h>
  18 #include <OpenSG/OSGGLUTWindow.h>
  19 #include <OpenSG/OSGSimpleSceneManager.h>
  20
  21 //additional headder files
  22 #include <OpenSG/OSGSceneFileHandler.h>
  23 #include <OpenSG/OSGDistanceLOD.h>
  24 #include <OpenSG/OSGSwitch.h>
  25 #include <OpenSG/OSGNameAttachment.h>
  26 #endif
  27
  28 OSG::SimpleSceneManagerRefPtr mgr;
  29 OSG::NodeRecPtr               scene;
  30
  31 int setupGLUT(int *argc, char *argv[]);
  32
  33 // this function will return the node named "FACESET_Woman"
  34 // if there is no such node NULL will be returned
  35 OSG::Node *checkName(OSG::Node *n)
  36 {
  37     OSG::UInt32 children = n->getNChildren();
  38
  39     //make sure a name existes
  40     if (getName(n))
  41     {
  42         //check if it is the name we are looking for
  43         if (getName(n) == std::string("FACESET_Woman"))
  44             // We got the node!
  45             return n;
  46     }
  47
  48     //check all children
  49     for(OSG::UInt32 i = 0; i < children; i++)
  50     {
  51         OSG::Node *r = checkName(n->getChild(i));
  52         if(r != NULL)
  53             // if it is not NULL it is the node we are looking for
  54             // so just pass it through
  55             return r;
  56     }
  57
  58     // no children's name matches or there are no more childs
  59     // so return NULL, indicating that the node was not found yet
  60     return NULL;
  61 }
  62
  63 OSG::NodeTransitPtr createScenegraph(void)
  64 {
  65     // At first we load all needed models from file
  66     OSG::NodeRecPtr w_high   =
  67         OSG::SceneFileHandler::the()->read("Data/woman_high.wrl");
  68
  69     OSG::NodeRecPtr w_medium =
  70         OSG::SceneFileHandler::the()->read("Data/woman_medium.wrl");
  71
  72     OSG::NodeRecPtr w_low    =
  73         OSG::SceneFileHandler::the()->read("Data/woman_low.wrl");
  74
  75     // we check the result
  76     if((w_high == NULL) || (w_medium == NULL)|| (w_low == NULL))
  77     {
  78         std::cout << "It was not possible to load all needed models from file"
  79                 << std::endl;
  80         return OSG::NodeTransitPtr();
  81     }
  82
  83     // now the LOD core
  84     OSG::DistanceLODRecPtr lod = OSG::DistanceLOD::create();
  85     lod->editSFCenter()->setValue(OSG::Pnt3f(0,0,0));
  86     lod->editMFRange()->push_back(200);
  87     lod->editMFRange()->push_back(500);
  88
  89     // the node containing the LOD core. The three models will be
  90     // added as its children
  91     OSG::NodeRecPtr lodNode = OSG::Node::create();
  92     lodNode->setCore(lod);
  93     lodNode->addChild(w_high);
  94     lodNode->addChild(w_medium);
  95     lodNode->addChild(w_low);
  96
  97     // create the node with switch core ********************
  98     OSG::SwitchRecPtr sw = OSG::Switch::create();
  99     //Notice: the first choice is 0
 100     sw->setChoice(0);
 101
 102     OSG::NodeRecPtr switchNode = OSG::Node::create();
 103     switchNode->setCore(sw);
 104     switchNode->addChild(lodNode);
 105
 106     //end switch creation **********************************
 107
 108     OSG::NodeRecPtr root = OSG::Node::create();
 109     root->setCore(OSG::Group::create());
 110     root->addChild(switchNode);
 111
 112     // we know want to extract the mesh geometry out of the graph
 113     // it is sufficent to pass the model only as root for searching
 114     OSG::NodeRecPtr     womanGeometry = checkName(w_high);
 115     OSG::GeometryRecPtr geo =
 116         dynamic_cast<OSG::Geometry *>(womanGeometry->getCore());
 117
 118     //new node with "old" geometry core referenced
 119     OSG::NodeRecPtr woman = OSG::Node::create();
 120     woman->setCore(geo);
 121
 122     //translate it a bit to see both women
 123     OSG::NodeRecPtr      womanTrans = OSG::Node     ::create();
 124     OSG::TransformRecPtr t          = OSG::Transform::create();
 125     OSG::Matrix m;
 126     m.setIdentity();
 127     m.setTranslate(OSG::Vec3f(0,0,200));
 128     t->setMatrix(m);
 129
 130     womanTrans->setCore(t);
 131     womanTrans->addChild(woman);
 132
 133     //add it to the root
 134     root->addChild(womanTrans);
 135
 136     return OSG::NodeTransitPtr(root);
 137 }
 138
 139 int main(int argc, char **argv)
 140 {
 141     OSG::osgInit(argc,argv);
 142
 143     {
 144         int winid = setupGLUT(&argc, argv);
 145         OSG::GLUTWindowRecPtr gwin = OSG::GLUTWindow::create();
 146         gwin->setGlutId(winid);
 147         gwin->init();
 148
 149         scene = createScenegraph();
 150
 151         mgr = OSG::SimpleSceneManager::create();
 152         mgr->setWindow(gwin );
 153         mgr->setRoot  (scene);
 154         mgr->showAll();
 155
 156         OSG::commitChanges();
 157     }
 158
 159     glutMainLoop();
 160
 161     return 0;
 162 }
 163
 164 void reshape(int w, int h)
 165 {
 166     mgr->resize(w, h);
 167     glutPostRedisplay();
 168 }
 169
 170 void display(void)
 171 {
 172     mgr->redraw();
 173 }
 174
 175 void mouse(int button, int state, int x, int y)
 176 {
 177     if (state)
 178         mgr->mouseButtonRelease(button, x, y);
 179     else
 180         mgr->mouseButtonPress(button, x, y);
 181
 182     glutPostRedisplay();
 183 }
 184
 185 void motion(int x, int y)
 186 {
 187     mgr->mouseMove(x, y);
 188     glutPostRedisplay();
 189 }
 190
 191 int setupGLUT(int *argc, char *argv[])
 192 {
 193     glutInit(argc, argv);
 194     glutInitDisplayMode(GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE);
 195
 196     int winid = glutCreateWindow("OpenSG First Application");
 197
 198     glutDisplayFunc(display);
 199     glutMouseFunc(mouse);
 200     glutMotionFunc(motion);
 201     glutReshapeFunc(reshape);
 202     glutIdleFunc(display);
 203
 204     return winid;
 205 }