void maTranslator::writeDagNodes(fstream& f)
{
fParentingRequired.clear();
MItDag dagIter;
dagIter.traverseUnderWorld(true);
MDagPath worldPath;
dagIter.getPath(worldPath);
//
// We step over the world node before starting the loop, because it
// doesn't get written out.
//
for (dagIter.next(); !dagIter.isDone(); dagIter.next())
{
MDagPath path;
dagIter.getPath(path);
//
// If the node has already been written, then all of its descendants
// must have been written, or at least checked, as well, so prune
// this branch of the tree from the iteration.
//
MFnDagNode dagNodeFn(path);
if (dagNodeFn.isFlagSet(fCreateFlag))
{
dagIter.prune();
continue;
}
//
// If this is a default node, it will be written out later, so skip
// it.
//
if (dagNodeFn.isDefaultNode()) continue;
//
// If this node is not writable, and is not a shared node, then mark
// it as having been written, and skip it.
//
if (!dagNodeFn.canBeWritten() && !dagNodeFn.isShared())
{
dagNodeFn.setFlag(fCreateFlag, true);
continue;
}
unsigned int numParents = dagNodeFn.parentCount();
if (dagNodeFn.isFromReferencedFile())
{
//
// We don't issue 'creatNode' commands for nodes from referenced
// files, but if the node has any parents which are not from
// referenced files, other than the world, then make a note that
// we'll need to issue extra 'parent' commands for it later on.
//
unsigned int i;
for (i = 0; i < numParents; i++)
{
MObject altParent = dagNodeFn.parent(i);
MFnDagNode altParentFn(altParent);
if (!altParentFn.isFromReferencedFile()
&& (altParentFn.object() != worldPath.node()))
{
fParentingRequired.append(path);
break;
}
}
}
else
{
//
// Find the node's parent.
//
MDagPath parentPath = worldPath;
if (path.length() > 1)
{
//
// Get the parent's path.
//
parentPath = path;
parentPath.pop();
//
// If the parent is in the underworld, then find the closest
// ancestor which is not.
//
if (parentPath.pathCount() > 1)
{
//
// The first segment of the path contains whatever
// portion of the path exists in the world. So the closest
// worldly ancestor is simply the one at the end of that
// first path segment.
//
path.getPath(parentPath, 0);
}
}
MFnDagNode parentNodeFn(parentPath);
if (parentNodeFn.isFromReferencedFile())
{
//
// We prefer to parent to a non-referenced node. So if this
// node has any other parents, which are not from referenced
// files and have not already been processed, then we'll
// skip this instance and wait for an instance through one
// of those parents.
//
unsigned i;
for (i = 0; i < numParents; i++)
{
if (dagNodeFn.parent(i) != parentNodeFn.object())
{
MObject altParent = dagNodeFn.parent(i);
MFnDagNode altParentFn(altParent);
if (!altParentFn.isFromReferencedFile()
&& !altParentFn.isFlagSet(fCreateFlag))
{
break;
}
}
}
if (i < numParents) continue;
//
// This node only has parents within referenced files, so
// create it without a parent and note that we need to issue
// 'parent' commands for it later on.
//
writeCreateNode(f, path, worldPath);
fParentingRequired.append(path);
}
else
{
writeCreateNode(f, path, parentPath);
//
// Let's see if this node has any parents from referenced
// files, or any parents other than this one which are not
// from referenced files.
//
unsigned int i;
bool hasRefParents = false;
bool hasOtherNonRefParents = false;
for (i = 0; i < numParents; i++)
{
if (dagNodeFn.parent(i) != parentNodeFn.object())
{
MObject altParent = dagNodeFn.parent(i);
MFnDagNode altParentFn(altParent);
if (altParentFn.isFromReferencedFile())
hasRefParents = true;
else
hasOtherNonRefParents = true;
//
// If we've already got positives for both tests,
// then there's no need in continuing.
//
if (hasRefParents && hasOtherNonRefParents) break;
}
}
//
// If this node has parents from referenced files, then
// make note that we will have to issue 'parent' commands
// later on.
//
if (hasRefParents) fParentingRequired.append(path);
//
// If this node has parents other than this one which are
// not from referenced files, then make note that the
// parenting for the other instances still has to be done.
//
if (hasOtherNonRefParents)
{
fInstanceChildren.append(path);
fInstanceParents.append(parentPath);
}
}
//
// Write out the node's 'addAttr', 'setAttr' and 'lockNode'
// commands.
//
writeNodeAttrs(f, path.node(), true);
writeLockNode(f, path.node());
}
//
// Mark the node as having been written.
//
dagNodeFn.setFlag(fCreateFlag, true);
}
//
// Write out the parenting for instances.
//
writeInstances(f);
}
//
// Write out all of the connections in the scene.
//
void maTranslator::writeConnections(fstream& f)
{
//
// If the scene has broken any connections which were made in referenced
// files, handle those first so that the attributes are free for any new
// connections which may come along.
//
writeBrokenRefConnections(f);
//
// We're about to write out the scene's connections in three parts: DAG
// nodes, non-DAG non-default nodes, then default nodes.
//
// It's really not necessary that we group them like this and would in
// fact be more efficient to do them all in one MItDependencyNodes
// traversal. However, this is the order in which the normal MayaAscii
// translator does them, so this makes it easier to compare the output
// of this translator to Maya's output.
//
//
// Write out connections for the DAG nodes first.
//
MItDag dagIter;
dagIter.traverseUnderWorld(true);
for (dagIter.next(); !dagIter.isDone(); dagIter.next())
{
MObject node = dagIter.item();
MFnDagNode dagNodeFn(node);
if (!dagNodeFn.isFlagSet(fConnectionFlag)
&& dagNodeFn.canBeWritten()
&& !dagNodeFn.isDefaultNode())
{
writeNodeConnections(f, dagIter.item());
dagNodeFn.setFlag(fConnectionFlag, true);
}
}
//
// Now do the non-DAG, non-default nodes.
//
MItDependencyNodes nodeIter;
for (; !nodeIter.isDone(); nodeIter.next())
{
MFnDependencyNode nodeFn(nodeIter.item());
if (!nodeFn.isFlagSet(fConnectionFlag)
&& nodeFn.canBeWritten()
&& !nodeFn.isDefaultNode())
{
writeNodeConnections(f, nodeIter.item());
nodeFn.setFlag(fConnectionFlag, true);
}
}
//
// And finish up with the default nodes.
//
unsigned int numNodes = fDefaultNodes.length();
unsigned int i;
for (i = 0; i < numNodes; i++)
{
MFnDependencyNode nodeFn(fDefaultNodes[i]);
if (!nodeFn.isFlagSet(fConnectionFlag)
&& nodeFn.canBeWritten()
&& nodeFn.isDefaultNode())
{
writeNodeConnections(f, fDefaultNodes[i]);
nodeFn.setFlag(fConnectionFlag, true);
}
}
}