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>>Cook (In-Process) Not exactly working. When I execute 'Dirty and cook this node' on a python Script node, the code is executed on the local seesion. However, when I execute 'Dirty and cook this node' on a ROP Fetch node, the script seems to be executesd, according to the checkbox's icon sign, but nothing happens on the both of local and background sessions.

Try this option.   Cook (In-Process) Runs the script during the cook stage in the same process as the Houdini session.

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Hi,  I am trying to control the rest length scale of a vellum sim with an attribute I created outside of the solver upwards in the stream. I managed to get it into the solver via a sop solver and attribute transfer but now I am struggling to connect that to the rest length scale. The vex field in the vellumconstraintproperties is not working for me, or I cant figure it out.    Cells_v04.hipnc

Hi, I have a question about a TOP Network process (please see the attached picture). I want to run two steps when executing Dirty and Cook: 1- Run a Python script that updates or sets a new cache path on a File Cache node. 2- Then run the actual simulation using a ROP Fetch node. The problem isn’t with the Python script itself, but rather that the Python Script node seems to execute in the background Houdini session used by TOPs, instead of the current local Houdini session. I want the script to apply changes to my local session, and then trigger the ROP Fetch simulation task. I suspect that using a Python Script node isn’t the right approach here — I probably need another method to execute the script locally before running the ROP Fetch. Or maybe I could fix by changing parameters like a Generate When parm or Evaluate scripting During parm, etc, not sure at all.  Of course, I could just run the Python script manually and then Dirty & Cook the network, but I have multiple dependent simulation steps, and I don’t want to manually update the File Cache nodes every time. So, is there a recommended way to achieve this?