// recursively build a table of geometry instances with ID and transform
// to be accessed when geometries are read in the second pass
bool OgreCollada::MeshWriter::createSceneDFS(const COLLADAFW::Node* cn, // node to instantiate
Ogre::Matrix4 xn) // accumulated transform
{
// apply this node's transformation matrix to the one inherited from its parent
const COLLADAFW::TransformationPointerArray& tarr = cn->getTransformations();
// COLLADA spec says multiple transformations are "postmultiplied in the order in which
// they are specified", which I think means like this:
for (size_t i = 0; i < tarr.getCount(); ++i) {
xn = xn * computeTransformation(tarr[i]);
}
// record any geometry instances present in this node, along with their attached materials
// and cumulative transform
const COLLADAFW::InstanceGeometryPointerArray& ginodes = cn->getInstanceGeometries();
for (int i = 0, count = ginodes.getCount(); i < count; ++i) {
COLLADAFW::InstanceGeometry* gi = ginodes[i];
if (m_geometryUsage.find(gi->getInstanciatedObjectId()) == m_geometryUsage.end()) {
// create empty usage list for this geometry
m_geometryUsage.insert(std::make_pair(gi->getInstanciatedObjectId(), GeoInstUsageList()));
}
m_geometryUsage[gi->getInstanciatedObjectId()].push_back(std::make_pair(&(gi->getMaterialBindings()), xn));
}
// recursively follow child nodes and library instances
const COLLADAFW::NodePointerArray& cnodes = cn->getChildNodes();
for (int i = 0, count = cnodes.getCount(); i < count; ++i) {
if (!createSceneDFS(cnodes[i], xn))
return false;
}
const COLLADAFW::InstanceNodePointerArray& inodes = cn->getInstanceNodes();
for (int i = 0, count = inodes.getCount(); i < count; ++i) {
LibNodesIterator lit = m_libNodes.find(inodes[i]->getInstanciatedObjectId());
if (lit == m_libNodes.end()) {
LOG_DEBUG("COLLADA WARNING: could not find library node with unique ID " +
boost::lexical_cast<Ogre::String>(inodes[i]->getInstanciatedObjectId()));
continue;
}
if (!createSceneDFS(lit->second, xn))
return false;
}
return true;
}
//------------------------------
void SceneGraphWriter::storeInstanceGeometries( const COLLADAFW::InstanceGeometryPointerArray& instanceGeometries,
const COLLADABU::Math::Matrix4& worldMatrix )
{
for ( size_t i = 0, count = instanceGeometries.getCount(); i < count; ++i)
{
COLLADAFW::InstanceGeometry* instanceGeometry = instanceGeometries[i];
OgreWriter::InstanceGeometryInfo instanceGeometryInfo( instanceGeometry, worldMatrix );
addGeometryUniqueIdInstanceGeometryInfoPair(instanceGeometry->getInstanciatedObjectId(), instanceGeometryInfo);
}
}