static SoSeparator *
setUpGraph(const SbViewportRegion &vpReg,
SoInput *sceneInput,
Options &options)
//
//////////////////////////////////////////////////////////////
{
// Create a root separator to hold everything. Turn
// caching off, since the transformation will blow
// it anyway.
SoSeparator *root = new SoSeparator;
root->ref();
root->renderCaching = SoSeparator::OFF;
// Add a camera to view the scene
SoPerspectiveCamera *camera = new SoPerspectiveCamera;
root->addChild(camera);
// Add a transform node to spin the scene
SoTransform *sceneTransform = new SoTransform;
sceneTransform->setName(SCENE_XFORM_NAME);
root->addChild(sceneTransform);
// Read and add input scene graph
SoSeparator *inputRoot = SoDB::readAll(sceneInput);
if (inputRoot == NULL) {
fprintf(stderr, "Cannot read scene graph\n");
root->unref();
exit(1);
}
root->addChild(inputRoot);
SoPath *path;
SoGroup *parent, *group;
SoSearchAction act;
// expand out all File nodes and replace them with groups
// containing the children
SoFile *fileNode;
act.setType(SoFile::getClassTypeId());
act.setInterest(SoSearchAction::FIRST);
act.apply(inputRoot);
while ((path = act.getPath()) != NULL) {
fileNode = (SoFile *) path->getTail();
path->pop();
parent = (SoGroup *) path->getTail();
group = fileNode->copyChildren();
if (group) {
parent->replaceChild(fileNode, group);
// apply action again and continue
act.apply(inputRoot);
}
}
// expand out all node kits and replace them with groups
// containing the children
SoBaseKit *kitNode;
SoChildList *childList;
act.setType(SoBaseKit::getClassTypeId());
act.setInterest(SoSearchAction::FIRST);
act.apply(inputRoot);
while ((path = act.getPath()) != NULL) {
kitNode = (SoBaseKit *) path->getTail();
path->pop();
parent = (SoGroup *) path->getTail();
group = new SoGroup;
childList = kitNode->getChildren();
for (int i=0; i<childList->getLength(); i++)
group->addChild((*childList)[i]);
parent->replaceChild(kitNode, group);
act.apply(inputRoot);
}
// check to see if there are any lights
// if no lights, add a directional light to the scene
act.setType(SoLight::getClassTypeId());
act.setInterest(SoSearchAction::FIRST);
act.apply(inputRoot);
if (act.getPath() == NULL) { // no lights
SoDirectionalLight *light = new SoDirectionalLight;
root->insertChild(light, 1);
}
else
options.hasLights = TRUE;
// check to see if there are any texures in the scene
act.setType(SoTexture2::getClassTypeId());
act.setInterest(SoSearchAction::FIRST);
act.apply(inputRoot);
if (act.getPath() != NULL)
options.hasTextures = TRUE;
camera->viewAll(root, vpReg);
// print out information about the scene graph
int32_t numTris, numLines, numPoints, numNodes;
countPrimitives( inputRoot, numTris, numLines, numPoints, numNodes );
printf("Number of nodes in scene graph: %d\n", numNodes );
printf("Number of triangles in scene graph: %d\n", numTris );
printf("Number of lines in scene graph: %d\n", numLines );
printf("Number of points in scene graph: %d\n\n", numPoints );
// Make the center of rotation the center of
// the scene
SoGetBoundingBoxAction bba(vpReg);
bba.apply(root);
sceneTransform->center = bba.getBoundingBox().getCenter();
return root;
}
