Hi @mia-elisenberg,
Thanks for reaching out to us!

I must note that as per our Support Procedures we cannot debug your code. Hence, in your future postings I kindly ask you to try simplifying your code to a minimal viable example, which highlights your question.

Regarding your question, creating keyframes for nodes can be a little trickier comparing to the ordinary objects, but the general data accessing scheme stays the same. @Dunhou has thankfully posted the simplified example for your question, which already shows crucial pieces of how one would access the CTrack, CCurve and CKey for the node port. (@Dunhou I won't get tired showing our appreciation in playing an active role in our community! 😉 ). Namely, you're expected to use GetBaseListForNode to get the BaseList2D element that corresponds to the node you have. Additionally, NimbusBaseInterface.GetDescID can be used to get the DescID of the port. After you have this information, the process of interacting with animation data isn't any different. Your can check the animation examples in our repository: Cinema-4D-Python-API-Examples/scripts/04_3d_concepts/scene_elements
/animation.

The only thing I'd like to point out here is handling color data. Namely, CKey is designed to operate with float values, but Opacity channel works with color data. Hence, you need to create a separate CTrack for each color channel. You basically do this by pushing your DescID one level further to access the elements of your color data. Please find small example below (based on the code shared by @Dunhou):

descLevelsRGB: list[c4d.DescLevel] = [ c4d.DescLevel(c4d.COLOR_R, c4d.DTYPE_REAL, 0), c4d.DescLevel(c4d.COLOR_G, c4d.DTYPE_REAL, 0), c4d.DescLevel(c4d.COLOR_B, c4d.DTYPE_REAL, 0) ] opacityValue: list[float] = [0.55, 0.66, 0.77] # example data to store in the keyframe ctime: c4d.BaseTime = c4d.BaseTime(doc.GetTime().GetFrame(doc.GetFps()), doc.GetFps()) for opacityChannelDescLevel, opacityChannelValue in zip(descLevelsRGB, opacityValue): # Get opacity channel DescID and push it to access color channel channelDescID: c4d.DescID = nimbusRef.GetDescID(opacityPort.GetPath()) channelDescID.PushId(opacityChannelDescLevel) track: c4d.CTrack = c4d.CTrack(opacityPortBL2D, channelDescID) opacityPortBL2D.InsertTrackSorted(track) curve: c4d.CCurve = track.GetCurve() key = c4d.CKey() track.FillKey(doc, opacityPortBL2D, key) # this is optional key.SetValue(curve, opacityChannelValue) key.SetTime(curve, ctime) curve.InsertKey(key)

Cheers,
Ilia