Still not possible to find out what's visible in the Timeline?
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@Cairyn said in Still not possible to find out what's visible in the Timeline?:
one that would return a list of all tracks in the scene.
Things in Cinema are often stored as internal branches (GetBranchInfo()). So you can read all the branches of all things to get all the things.
The "Active Object" examples does that to list the content of the scene, including the tracks.
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Thank you, @PluginStudent . I have tried to translate the C++ code from the example into a basic Python script that just writes the
GetBranchInfotree to the console; sadly there is a mysterious crash/hang somewhere...import c4d from c4d import gui emCount = 0 def showBranchInfo(depth, obj): global emCount # Validity check if obj == None: return # Object output emCount += 1 print " " * depth, "Count=", emCount, "(object)" if isinstance(obj, c4d.documents.BaseDocument): print " " * depth, "DOC:", obj.GetDocumentName() elif not isinstance(obj, c4d.BaseList2D): print " " * depth, "Not a BaseList2D: ", obj return else: print " " * depth, "OBJ:", obj.GetName() bis = obj.GetBranchInfo() if bis == None or len(bis) == 0: return for bi in bis: # list of dict{‘head’, ‘name’, ‘id’, ‘flags’} if len(bi) == 0: return # ### Test listHead = bi['head'] nodeName = bi['name'] # List head output emCount += 1 node = None print " " * (depth+1), "Count=", emCount, "(list head)", nodeName if listHead == None: print " " * (depth+1), "No list head" elif not isinstance(listHead, c4d.GeListHead): print " " * (depth+1), "Not a GeListHead:", listHead else: print " " * (depth+1), nodeName, listHead node = listHead.GetFirst() # Content of sublist branch locCount = 0 if node == None: print " " * (depth+2), "Empty list" while node != None: emCount += 1 print " " * (depth+2), "El:", locCount, node locCount += 1 if isinstance(node, c4d.BaseList2D): showBranchInfo(depth + 3, node) # no else case; node was already printed node = node.GetNext() # missing here: recurse into children of "node" or "obj" def main(): print " " print "GetBranchInfo" print "=============" showBranchInfo(1, doc) if __name__=='__main__': main()If I limit emCount or depth to certain values, this recursion works fine (as mentioned in the code it's not going down into the child lists of a
BaseObjectbut that's a thing I can add later).
If I just run the code with no limits, C4D hangs (and in one instance even crashed with an access violation) while doing... something. Even after two days of experimenting, I have not found the exact point where it fails. (Half of the code is already validation...) I guess I will need to set up a complete debugging environment to catch the culprit... before even returning to the original question... -
Not sure if it is related to your crash, but I have never seen someone using
isinstance()this way.In the C4D API, there is IsInstanceOf() to check for inheritance or type. See also Type.
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@PluginStudent
isinstanceis the plain Python class comparison.IsInstanceOf()does not work here because it compares against type constants, and there is (AFAIK) no such constant forBaseDocumentorBaseList2DorGeListHead.EDIT: Oh, I'm stupid. I just saw that such a constant is used in the original example... okay, let's try that...
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@PluginStudent No, didn't work with
IsInstanceOfeither.For completeness:
TbasedocumentandTbaselist2dexist but are only documented in the C++ manual; missing in Python.Tgelistheaddoes not exist in either, so I still need to check the class against that with the Pythonicisinstance. -
Hi Just to let you know its seems there is currently a bug somewhere (still have to figure out) but to avoid any issue check if the returned GeListHead and then if you iterate over all its children that each c4dAtom returned is alive with C4DAtom.IsAlive before doing anything on it(e.g.s print them).
That should fix your issue.
Cheers,
Maxime.MAXON SDK Specialist
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@m_adam Thank you, unfortunately that didn't work either... I check the object, the list head, and the list nodes all for being alive, and I do not get any output that they aren't. The crashes continue.
I have compiled the SDK, and the "Active Object Properties" dialog works fine even in places where the Python script hangs. So, it might be a Python-only issue.
So far, I think that these places are when the script encounters a "Tags" object (type 200001048). The first place I saw this was under
ProjektHooks/PLKHUD/PSUNDOHEAD/PKHOP. When I skipped that branch explicitly, the next place of crash was underModeling Objects Hooks/Modeling Objects Branch/Plane ManipulatorandPivot Manipulator(both branches contain a "Tags" element). Didn't continue after that.However, trying to exclude these node types didn't help either. Apparently, the objects are so volatile that any way of touching them creates the crash already.
(Since the scene tags also hide under these nodes, I do not want to exclude them, anyway.)Here's the code I tried last:
import c4d from c4d import gui emCount = 0 handledList = [] def showBranchInfo(depth, obj, f): global emCount, handledList, maxCount, dialogCount try: # Validity check if obj == None: return if obj in handledList: print "Already handled! : ", obj print >>f, "Already handled! : ", obj f.flush() return else: handledList.append(obj) if not obj.IsAlive(): print "Object not alive!" print >>f, "Object not alive!" f.flush() return if obj.GetType() == 200001048: print "Object is 200001048!" print >>f, "Object is 200001048!" f.flush() return except: print >>f, "ERROR in validity check" f.flush() return try: # Object output emCount += 1 print " " * depth, "Count=", emCount, "(object)" print >>f, " " * depth, "Count=", emCount, "(object)" f.flush() if isinstance(obj, c4d.documents.BaseDocument): print " " * depth, "DOC:", obj.GetDocumentName() print >>f, " " * depth, "DOC:", obj.GetDocumentName() f.flush() # this is also a BaseList2D so we can continue elif not isinstance(obj, c4d.BaseList2D): print " " * depth, "Not a BaseList2D: ", obj print >>f, " " * depth, "Not a BaseList2D:", obj f.flush() return else: print " " * depth, "OBJ:", obj.GetName() print >>f, " " * depth, "OBJ:", obj.GetName() f.flush() except: print >>f, "ERROR in object output" f.flush() return try: child = obj.GetDown() if child != None: while child: showBranchInfo(depth + 1, child, f) child = child.GetNext() except: print >>f, "ERROR in subobject recursion" f.flush() return try: bis = obj.GetBranchInfo() if bis == None: print "ERROR: no branch info retrieved" print >>f, "ERROR: no branch info retrieved" f.flush() return # empty branch info is allowed, so no len() check! except: print >>f, "ERROR in GetBranchInfo" f.flush() return try: for bi in bis: # list of dict{‘head’, ‘name’, ‘id’, ‘flags’} try: if len(bi) == 0: print "ERROR: no entries in dict list" print >>f, "ERROR: no entries in dict list" f.flush() return listHead = bi['head'] nodeName = bi['name'] # print bi['id'] # print bi['flags'] except: print >>f, "ERROR in dict list check" f.flush() return try: # List head output emCount += 1 node = None print " " * (depth+1), "Count=", emCount, "(list head)", nodeName print >>f, " " * (depth+1), "Count=", emCount, "(list head)", nodeName f.flush() # Crash irgendwo hier if listHead == None: print " " * (depth+1), "No list head" print >>f, " " * (depth+1), "No list head" f.flush() elif not listHead.IsAlive(): print "List head not alive!" print >>f, "List head not alive!" f.flush() elif not isinstance(listHead, c4d.GeListHead): print " " * (depth+1), "Not a GeListHead:", listHead print >>f, " " * (depth+1), "Not a GeListHead:", listHead f.flush() else: print " " * (depth+1), nodeName, listHead print >>f, " " * (depth+1), nodeName, listHead f.flush() node = listHead.GetFirst() except: print >>f, "ERROR in list head output" f.flush() return try: # Content of sublist branch locCount = 0 if node == None: print " " * (depth+2), "Empty list" print >>f, " " * (depth+2), "Empty list" f.flush() while node != None: if node.IsAlive(): if node.GetType() != 200001048: emCount += 1 print " " * (depth+2), "El:", locCount, node print >>f, " " * (depth+2), "El:", locCount, node f.flush() locCount += 1 if isinstance(node, c4d.BaseList2D): showBranchInfo(depth + 3, node, f) # no else case; node was already printed else: print "List node is 200001048!" print >>f, "List node is 200001048!" f.flush() return else: print "List node not alive!" print >>f, "List node not alive!" f.flush() node = node.GetNext() except: print >>f, "ERROR in sublist branch handling" f.flush() return # missing here: recurse into children of "node" or "obj" except: print >>f, "ERROR in dictionary loop" f.flush() return try: print >>f, " " * depth, "Returning from depth:", depth f.flush() except: print >>f, "ERROR in return" f.flush() return def main(): print " " print "GetBranchInfo" print "=============" f = open("L:/getbranchinfo.txt", "at") showBranchInfo(1, doc, f) f.close() if __name__=='__main__': main()You can happily ignore the
try/exceptblocks, as they never caught any error.
Considering that the code now consists of 80% error checking, this is a very frustrating exercise.Interestingly, my initial example that uses
GetCTracks()works fine (for what it does) and does not crash, even when handling (scene) tags. I suspect the issue ultimately lies in theGetBranchInfo()function somewhere. -
creating a cube and call op.GetBranchInfo is enough to trigger a crash, since its a C++ crash, there is no room for python to catch it.
MAXON SDK Specialist
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@m_adam oops... didn't expect that, since the Active Object Properties sample works fine (solely in C++).
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Okay, it's definitely the Tags node. I added some code to check for the name "Tags" in the list returned by GetBranchInfo() to skip that dictionary entry before even the list head is touched. That works, the recursion/iteration is running through without crash.
Of course, that makes the scene tags disappear from the list, so I also added in an
elsecase that explicitly callsGetTags()on the original object, and continues the recursion with any returned tags.For testing, I also added a collector list for the tracks (which were the original goal of this exercise...) and print the tracks at the end of the code. For a few test scenes, this apparently works; I have no idea about the overall soundness and completeness of this workaround though.
Here's the code for anyone who might face the same issue:
import c4d from c4d import gui emCount = 0 handledList = [] tracks = [] def showBranchInfo(depth, obj, f): global emCount, handledList, maxCount, dialogCount, tracks # Validity check if obj == None: return if not obj.IsAlive(): print "Object not alive!" print >>f, "Object not alive!" f.flush() return if obj.GetType() == 200001048: print "Object is 200001048!" print >>f, "Object is 200001048!" f.flush() return if obj in handledList: print "Already handled! : ", obj print >>f, "Already handled! : ", obj f.flush() return else: handledList.append(obj) # Object output emCount += 1 print " " * depth, "Count=", emCount, "(object)" print >>f, " " * depth, "Count=", emCount, "(object)" f.flush() if isinstance(obj, c4d.documents.BaseDocument): print " " * depth, "DOC:", obj.GetDocumentName() print >>f, " " * depth, "DOC:", obj.GetDocumentName() f.flush() # this is also a BaseList2D so we can continue elif not isinstance(obj, c4d.BaseList2D): print " " * depth, "Not a BaseList2D: ", obj print >>f, " " * depth, "Not a BaseList2D:", obj f.flush() return else: print " " * depth, "OBJ:", obj.GetName() print >>f, " " * depth, "OBJ:", obj.GetName() f.flush() # assemble the tracks of the object addTracks = obj.GetCTracks() # returns a list tracks.extend(addTracks) # go through the children of the object if present child = obj.GetDown() if child != None: while child: showBranchInfo(depth + 1, child, f) child = child.GetNext() # check the branch info and go into all dependent branches bis = obj.GetBranchInfo() if bis == None or len(bis) == 0: print " " * (depth+1), "No branch info retrieved, or empty" print >>f, " " * (depth+1), "No branch info retrieved, or empty" f.flush() return for bi in bis: # list of dict{‘head’, ‘name’, ‘id’, ‘flags’} if len(bi) == 0: print "ERROR: no entries in dict list" print >>f, "ERROR: no entries in dict list" f.flush() return nodeName = bi['name'] if nodeName != "Tags": listHead = bi['head'] # print bi['id'] # print bi['flags'] # List head output emCount += 1 node = None print " " * (depth+1), "Count=", emCount, "(list head)", nodeName print >>f, " " * (depth+1), "Count=", emCount, "(list head)", nodeName f.flush() # Crash irgendwo hier if listHead == None: print " " * (depth+1), "No list head" print >>f, " " * (depth+1), "No list head" f.flush() elif not listHead.IsAlive(): print "List head not alive!" print >>f, "List head not alive!" f.flush() elif not isinstance(listHead, c4d.GeListHead): print " " * (depth+1), "Not a GeListHead:", listHead print >>f, " " * (depth+1), "Not a GeListHead:", listHead f.flush() else: print " " * (depth+1), nodeName, listHead print >>f, " " * (depth+1), nodeName, listHead f.flush() node = listHead.GetFirst() # Content of sublist branch locCount = 0 if node == None: print " " * (depth+2), "Empty list" print >>f, " " * (depth+2), "Empty list" f.flush() while node != None: if node.IsAlive(): if node.GetType() != 200001048: emCount += 1 print " " * (depth+2), "El:", locCount, node print >>f, " " * (depth+2), "El:", locCount, node f.flush() locCount += 1 if isinstance(node, c4d.BaseList2D): showBranchInfo(depth + 3, node, f) # no else case; node was already printed else: print "List node is 200001048!" print >>f, "List node is 200001048!" f.flush() return else: print "List node not alive!" print >>f, "List node not alive!" f.flush() node = node.GetNext() else: print "Tags skipped!" print >>f, "Tags skipped!" f.flush() if isinstance(obj,c4d.BaseObject): taglist = obj.GetTags() print " " * (depth+2), "Tag list, length=", len(taglist) print >>f, " " * (depth+2), "Tag list, length=", len(taglist) f.flush() for tag in taglist: showBranchInfo(depth + 3, tag, f) # missing here: recurse into children of "node" or "obj" print >>f, " " * depth, "Returning from depth:", depth f.flush() def main(): global tracks print " " print "GetBranchInfo" print "=============" f = open("L:/getbranchinfo.txt", "at") showBranchInfo(1, doc, f) for track in tracks: print track print >>f, track f.close() if __name__=='__main__': main()
(also, unsolicited advertising because I really spend too much time with this)
https://www.patreon.com/cairyn
there you go! -
Hi, I found the issue, unfortunately, nothing on your side you can do to fix it.
I marked this topic as solved, and will bump the topic once a fix is included in a public release.
Keep in mind this is a Python only issue.Cheers,
Maxime.MAXON SDK Specialist
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@m_adam okay, good that it's found... I guess I can go with the code above for now that excludes tags explicitly and gathers them in a different recursion.
As per the original issue (there is no function in the API that returns the currently visible tracks in timeline n), I guess I would need to make a requirement/suggestion on Maxon's site? Or is something like this planned already?
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The bug is fixed in R23.
Cheers,
Maxime
