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    Redshift deleting using old information

    Cinema 4D SDK
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    • ferdinandF
      ferdinand
      last edited by ferdinand

      Hi,

      I am not quite sure if I do understand your question correctly. From what I am understanding, you have the graphview nodes A and B, where the nodes are the relationship A -> B, and you are deleting A, but would expect B to maintain its state after that?

      Cinema does not do that, probably for the reason that it would contradict the state machine nature of a node based interpreted language. Your only option to maintain the states of the input ports formerly driven by your user data node, would be to iterate over all output ports of that user data node and cache their current states, then iterate over all input ports each output port is being connected to, disconnect them one by one and write the cached state to the BaseContainer of the node that input port is attached to.

      Cheers
      zipit

      MAXON SDK Specialist
      developers.maxon.net

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      • SwinnS
        Swinn
        last edited by

        Would it be possible for you to show me a few lines of code that demonstrate what you are talking about? Especially disconnecting the ports one at a time. Thanks.

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        • ferdinandF
          ferdinand
          last edited by ferdinand

          Hi,

          There are quite a few hoops to jump through, but this example should get you the idea.

          import c4d
          
          def get_port_descid(node, port):
              """Returns the DescID for a ``GvPort``.
          
              If all our ports would be for static description elements, this would be
              easy. It would be just ``port.GetSubID()``. Unfortunately we are dealing
              with a lot of dynamic descriptions in the context of Xpresso, and at
              least I am not aware of any builtin methods that would return the 
              ``DescID`` of a ``GvPort`` in a more sane way.
          
              This solution is especially lazy, a solution less prone to errors
              would be to iterate over the description of the ``GvNode`` and see which
              combination of ``m, s, u`` is in there.
          
              Args:
                  node (``c4d.modules.graphview.GvNode``): The node of the port.
                  port (``c4d.modules.graphview.GvPort``): The port to get the DescID for.
              
              Returns:
                  ``tuple[int]`` or ``None``: The resolved DescID.
              """
              # The fragments (DescLevels) of the DescID of the port. The problem is
              # that all methods always return an integer-
              m, s, u = port.GetMainID(), port.GetSubID(), port.GetUserID()
          
              # Now we are just trying to access the node and see if it raises an
              # (attribute) error. If so, we just try the next combination.
          
              # There are no user data DescLevels below 1.
              if u > 0:
                  try:
                      node[(m, s, u)]
                      # It is a user data DescID.
                      return (m, s, u)
                  except AttributeError as e:
                      pass
          
              try:
                  node[(m, s)]
                  # It is a dynamic description DescID.
                  return (m, s)
              except AttributeError as e:
                  pass
          
              try:
                  node[s]
                  # It is a static description DescID.
                  return s
              except AttributeError as e:
                  pass
          
              return None
          
          def main():
              """Entry point.
              """
              # This example is for a Xpresso GraphView instance, since I do not
              # have access to RedShift. I did use two constant nodes and a math 
              # node as an example scene.
              if not op or not op.GetTag(c4d.Texpresso):
                  return 
          
              tag = op.GetTag(c4d.Texpresso)
              master = tag.GetNodeMaster()
              root = master.GetRoot()
          
              if not root:
                  return
          
              nodes = root.GetChildren()
              if not nodes:
                  return
          
              # I just took the first top-level node as the node to disconnect, 
              # which was one of the constant nodes connected to the math node.
              out_node = nodes[0]
          
              # Go over all output ports in our node to disconnect/remove.
              for out_port in out_node.GetOutPorts():
                  # Get all input ports the current output port is connected to.
                  connected_ports = out_port.GetDestination()
                  # Severe all connections from our output port.  
                  out_port.Remove()
                  # Let Cinema catch up.
                  c4d.EventAdd()
                  # This one of the nastier parts. We will have to unwind the
                  # DescID the output port has been build for. See the 
                  # respective function for details.
                  out_did = get_port_descid(out_node, out_port)
                  # We couldn't resolve the DescID properly.
                  if out_did is None:
                      continue
                  # Now we are just going over all input ports, get the DescID
                  # they are pointing at and write the value from our output_node
                  # to the input_node with these two DescIDs.
                  for in_port in connected_ports:
                      in_node = in_port.GetNode()
                      in_did = (in_port.GetMainID(), in_port.GetSubID())
                      in_did = get_port_descid(in_node, in_port)
                      if in_did is not None:
                          in_node[in_did] = out_node[out_did]
          
          if __name__=='__main__':
              main()
          

          Cheers,
          zipit

          MAXON SDK Specialist
          developers.maxon.net

          1 Reply Last reply Reply Quote 1
          • SwinnS
            Swinn
            last edited by

            Thanks, zipit, you are a Code God! Much appreciated. 🙂

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            • SwinnS
              Swinn
              last edited by

              Hmmm. I tried to implement the code (fixed indent errors in the first def) and the print out looks like it is catching what it should but the User Data is not being copied over to the inputs before it gets deleted. Any idea what I am doing wrong?

                  def get_port_descid(node, port):
                      m, s, u = port.GetMainID(), port.GetSubID(), port.GetUserID()
                      if u > 0:
                          try:
                              node[(m, s, u)]
                              return (m, s, u)
                          except AttributeError as e:
                              pass
                          try:
                              node[(m, s)]
                              return (m, s)
                          except AttributeError as e:
                              pass
                          try:
                              node[s]
                              return s
                          except AttributeError as e:
                              pass
              
                      return None
              
                  for item in spline_id:
                      rs_mat = doc.SearchObject ("S" + str (item) + " Gas " + str (bake_name))
                      rs_tag = rs_mat.GetTag(c4d.Ttexture)
                      rs_mat = rs_tag.GetMaterial()
                      outputNode = rs_mat[c4d.REDSHIFT_GRAPH_NODES]
                      gvMaster = outputNode.GetNodeMaster()
                      gvRoot = gvMaster.GetRoot()
              
                      currentNode = gvRoot.GetDown()
                      while currentNode is not None:
                          if currentNode.GetName() == "Neon Redshift":
                              for out_port in currentNode.GetOutPorts():
              
                                  connected_ports = out_port.GetDestination()
                                  out_port.Remove()
              
                                  c4d.EventAdd()
              
                                  out_did = get_port_descid(currentNode, out_port)
                                  print out_did
                                  if out_did is None:
                                      continue
              
                                  for in_port in connected_ports:
                                      in_node = in_port.GetNode()
                                      in_did = (in_port.GetMainID(), in_port.GetSubID())
                                      in_did = get_port_descid(in_node, in_port)
                                      if in_did is not None:
                                          in_node[in_did] = currentNode[out_did]
              
                              currentNode.Remove()
                              break
              
                          currentNode = currentNode.GetNext()
              
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              • SwinnS
                Swinn
                last edited by

                Because data is coming from User Data, do I need additional info as per this post?
                https://developers.maxon.net/forum/topic/5195

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                • ferdinandF
                  ferdinand
                  last edited by ferdinand

                  Hi,

                  I did not really test the user data stuff, I just included it, since I knew you are going to need it. But looking at my code now, the user data stuff does not make much sense. It should probably be node[(m, u)] or node[(s, u)]to test for user data ids (probably the first one). User data DescIDs follow the form ID_USERDATA, x, so for example 700, 1 for the first element. You have to poke around a little bit to find out what is what, but my guess would be node[(m, u)].

                  If you keep running into errors, you should try the description stuff I mentioned in the function docstring instead. The approach of the function is not the safest 😉

                  PS: You also do not need the line in_did = (in_port.GetMainID(), in_port.GetSubID()), this is just some garbage I forgot to delete before I realised that I was going to need a dedicated function for this 😉

                  Cheers,
                  zipit

                  MAXON SDK Specialist
                  developers.maxon.net

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                  • SwinnS
                    Swinn
                    last edited by

                    The original code yields image 1:
                    Screen Shot 2020-05-31 at 5.13.22 AM.png
                    m, u yields image 2:
                    Screen Shot 2020-05-31 at 5.14.23 AM.png
                    s, u yields image 3:
                    Screen Shot 2020-05-31 at 5.15.05 AM.png
                    It doesn't look like any of the actual User Data Values (3 of which are colour) are coming through. Here are images of the node and the UD:
                    Screen Shot 2020-05-31 at 5.18.21 AM.png
                    Screen Shot 2020-05-31 at 5.18.46 AM.png
                    Neither m,u or s,u causes the actual User Data to transfer to the nodes before the User Data node gets deleted. Is there something I am missing?

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                    • ferdinandF
                      ferdinand
                      last edited by ferdinand

                      Hi,

                      I actually meant doing that inside the get_port_descid function. However, I just did it for you and found out that for user data DescID elements the port returns some gibberish for m, s, u like for example 20000000 1000 -1 for a port for the first user data element for a null (we would at least expect 700 and 1 to pop up in there).

                      The problem is that ports for user data elements and the DescID they are being build for always have been a bit weird (see GvNode.AddPort). To build a port for the first user data element of a node, we would initialise it with the DescID (700, 5, 1) (the weird part being the 5, which is the integer for the symbol DTYPE_SUBCONTAINER). The other problem is that ports do not really expose the element they point at to the outside world.

                      I am afraid that you will have to wait for MAXON to shed some light on the topic, but I would not hold my breath for them coming up with a solution. It might very well be the case that you cannot infer the DescID for ports pointing at user data elements.

                      Cheers,
                      zipit

                      MAXON SDK Specialist
                      developers.maxon.net

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                      • SwinnS
                        Swinn
                        last edited by

                        Cool. I will try a different approach. Thanks for all your help on this, zipit. 🙂

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                        • SwinnS
                          Swinn
                          last edited by Swinn

                          I tried inputting the User Data directly into a RS port using Python and this code:

                          import c4d
                          
                          def main():
                          
                              obj = op.GetObject()
                              neon_col_INPUT = obj[c4d.ID_USERDATA,834]
                          
                              # List: Spline, Colour, Power, Gas, Blend.
                              spline_UD = {1: 618}
                          
                              for item in spline_UD:
                                  rs_mat = doc.SearchObject ("S" + str (item) + " Gas")
                                  rs_tag = rs_mat.GetTag(c4d.Ttexture)
                                  rs_mat = rs_tag.GetMaterial()
                                  outputNode = rs_mat[c4d.REDSHIFT_GRAPH_NODES]
                                  gvMaster = outputNode.GetNodeMaster()
                                  gvRoot = gvMaster.GetRoot()
                          
                                  colour = obj[c4d.ID_USERDATA,spline_UD[item]]
                                  print colour
                          
                                  power = obj[c4d.ID_USERDATA,619]
                                  gas = obj[c4d.ID_USERDATA,65]
                                  blend = obj[c4d.ID_USERDATA,66]
                          
                                  currentNode = gvRoot.GetDown()
                                  while currentNode is not None:
                                      if currentNode.GetName() == "RS Material":
                                          RSMaterial[c4d.REDSHIFT_SHADER_MATERIAL_EMISSION_COLOR] = colour
                                          break
                          

                          Now my code causes C4D to hang. Can you help?

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                          • SwinnS
                            Swinn
                            last edited by

                            I figured out a way to get this to work. They key is separating the User Data out of the RS XPresso node but still maintaining a connection to this node through a regular XPresso node. Cinema won't let me drag Redshift nodes from the RS XPresso window to the C4D XPresso window. Nor can I drag them from the AM.

                            The solution is to delete the User Data from the RS XPresso window, paste it into a new C4D Xpresso window, then use Set Driven (Absolute) on the RS nodes I need what is essentially double access to. Cinema then automatically creates a new XPresso node, which I then cut the contents from and paste them into my UD Xpresso node.

                            My only question is what is the difference between Set Driven (Absolute) and Set Driven (Relative)? Does it make a difference? Thanks.

                            P 1 Reply Last reply Reply Quote 0
                            • ferdinandF
                              ferdinand
                              last edited by

                              Hi,

                              sorry, I did not see your replies. But I cannot help you as I do neither have access to Redshift nor am very fluent when it comes to Cinemas features.

                              Cheers,
                              zipit

                              MAXON SDK Specialist
                              developers.maxon.net

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                              • P
                                PluginStudent @Swinn
                                last edited by

                                @Swinn said in Redshift deleting using old information:

                                My only question is what is the difference between Set Driven (Absolute) and Set Driven (Relative)? Does it make a difference?

                                Both setups add a Range Mapper node. In case of 'Relative', this range mapper creates an offset. See the online help.

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                                • SwinnS
                                  Swinn
                                  last edited by

                                  Thanks, PluginStudent! 🙂

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                                  • ManuelM
                                    Manuel
                                    last edited by

                                    hi,

                                    your question is sometimes not obvious 😄
                                    Even with the scene it's a bit compicated.

                                    What i can say about your code is that you should be more defensive in your code. Always check the value before continue.

                                    For example what if the object is not found ? You should continue to the next item or stop ?

                                    for item in spline_UD:
                                            rs_mat = doc.SearchObject ("S" + str (item) + " Gas")
                                            if rs_mat is None:
                                                # Because we don't have object to continue, we iterate to the next item.
                                                continue
                                            ...
                                    

                                    Cheers,
                                    Manuel

                                    MAXON SDK Specialist

                                    MAXON Registered Developer

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