Hello everyone,

I'm hoping someone can assist me with an issue I'm facing while developing a procedural asset in Houdini.

I have created an asset that procedurally generates rooms and doors within a scene. Each door has position attributes (and possibly other settings) that I would like to expose through the Parameter Interface of the asset to enable easier control over the doors.

My challenge is to dynamically create parameters in the interface for each generated door. Since the number of doors generated can vary, I'm looking for a method to automatically create parameters for each door.

I have already tried using "Create Spare Parameters" in the Parameter Interface, but this method only creates the parameters once and doesn't update them based on the number of generated doors.

I'm sure there's a more advanced way to tackle this issue using Python Scripting in Houdini, but unfortunately, I'm not very experienced with Python.

I would greatly appreciate any suggestions, sample code, or guidelines on how to create dynamic parameters for the generated doors in my asset.

Thank you in advance for your help and advice. Any contribution is highly appreciated!

Hi Davide,

it is challenging to provide support without any file example. It is a matter of testing what would work and about clarity.

Otherwise it would take a long time to make a test case and then try something out.

Have a nice day!

You should be able to use multiparms

If you want to use Python and the HOM API then you can basically get or set parameters (parm).

If you drag and drop a parm from the parmeter editor to the Python shell you can see the absolute path.

example:

hou.parm(”/avsolute/path/node/parm”).method()

.metod() is just a plceholder.

Usually you can write:
.eval() to get a value
or
.set(”10”) to set a parm.

Then try searching this forum for examples from past questions.

Also if you want a parm to read a promoted value then you set a keyframe to the parm that reads a value.

If possible try promoting the entire multiparms, because it is complicated, and maybe impossible, to connect individual parms from subnet to promoted after you made an HDA.

I am afraid having too many controls would make the hda confusing and hard to use but nevertheless its good to know how to do this.

I just made a simplest example for this without using python. It might give you some insights on how you could go about it.

Since it is dynamically updating the parms each time the number of rooms increase or decrease, which ever parms you already setup might get destroyed. Hmm not really ideal, but here you go.

Mohanpugaz
I am afraid having too many controls would make the hda confusing and hard to use but nevertheless its good to know how to do this.

I just made a simplest example for this without using python. It might give you some insights on how you could go about it.

Since it is dynamically updating the parms each time the number of rooms increase or decrease, which ever parms you already setup might get destroyed. Hmm not really ideal, but here you go.

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You are absolutely right! For now, the solution you provided works perfectly for me, and it's very helpful in understanding how to approach the situation. I sincerely thank you for your assistance and contribution. If you have any other suggestions or ideas in the future, I'd be more than happy to listen to them. Thanks again!

Mohanpugaz
I am afraid having too many controls would make the hda confusing and hard to use but nevertheless its good to know how to do this.

I just made a simplest example for this without using python. It might give you some insights on how you could go about it.

Since it is dynamically updating the parms each time the number of rooms increase or decrease, which ever parms you already setup might get destroyed. Hmm not really ideal, but here you go.

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"I tried this solution, but the file gets filled with bugs, causing errors, and the foreach loops no longer work correctly."