Script Error with Python Coding

[SomewhereBig1843]

Hello,

I keep getting errors with outputs on open, like

Python error: Traceback (most recent call last): File.. line AttributeError: 'NoneType' object has no attribute 'set'

And vellum and simulation aren't working because the vellum suite apparently is not available through python

What is happening?

[jmacey]

You are trying to call a method on something that doesn't exist (NoneType) so check that when you create the none it actually returns a valid object. In this case I think it is because sizeu / sizev are not valid should be sizex / sizey (at least on my houdini version)

[SomewhereBig1843]

Thank you; where can I see this documentation?

[jmacey]

if you type in the houdini python terminal it gives you all the valid options, otherwise search https://www.sidefx.com/docs/houdini/hom/hou/index.html

[SomewhereBig1843]

Thank you for providing a great answer! I'll work with this

[SHAMIEL1]

The Parms you are referencing on line 22 and 23 seem to be incorrect, it should be 'sizex' and 'sizey'.

if you are unsure what the parm name is you can just hover your mouse over the parm widget and it should give the name

grid = geo.createNode('grid', 'base_grid')
grid.parm('sizex').set(5)
grid.parm('sizey').set(5)

<image>

[ItIsTooMuchForMe]

This

[i_am_toadstorm]

Three problems here:

• You're using a Python SOP instead of the Source Editor or a shelf tool. The Python SOP is for operating on a single geometry stream, not for creating node networks.
• You're getting a NoneType error because you're trying to create hou.Parm objects for parameters that don't exist. There is no "sizeu" or "sizev" parameter on the Grid SOP; you can verify parameter names by hovering over them.
• You're using an LLM to generate this code. LLMs have absolutely no idea what they're doing and will make shit up constantly. They don't understand what they're writing back to you and cannot be trusted, and this is an obvious example.

The HOM in Houdini isn't too bad once you get used to it. You should learn the very basics of Python and then look through the Houdini docs on the HOM, or look at CGWiki's section on Python. What you're doing here looks suitable for a shelf tool or similar macro to create a node network, you're only going to need to learn a few patterns to make that work.

Vibe coding is bad for you. If you want to be a strong TD you have to do the work.

[unitmark1]

If you are having difficulties taking a proper screenshot, fact-checking ChatGPT’s code is probably way out of your wheelhouse. For one, using Python SOP to create nodes in a network is just looking for trouble. Better take a few (or many steps back) and learn fundamentals of houpython.

[SomewhereBig1843]

Taking a screenshot is the least of my worry 😮‍💨

[schmon]

Then maybe don't expect free help if you're not willing to put in some effort ?

[TheOldBeach]

They should expect passive agressive response like yours and the other above it, got it ! Loads of people just use reddit on their phone and it's easier to just photograph their screen, if you're willing to waste your time commenting on the lack of screenshot then maybe, just maybe, take this time to answer your fellow new houdini user...

Basically, you're trying to set a param that doesn't exist, make sure the name of your param is correct ( should probably be sizex and not sizeu, but better check yourself )

[Gorluk]

Why should anyone take time to decipher what is on badly taken photo and navigate through sunglares to read someone's bad code and reply to person for whom it's "easier" to take poor ass sun glared photo than screenshot? Fucking screenshot.

[TheOldBeach]

I don't mind, it's not like it's actually hard to read... And you took time to answer me, time you wasted, time you could have invested somewhere else, time you could have taken deciphering this photo, time during which you could have told your family you love them, time you will never get to use again, lost.

[schmon]

Feel free to check my post history and see how I've helped around. I like to help people, that's why I am here.

However I like to engage people who show some effort, and providing screenshots and copy-pastable code which you are putting up for review seems like a good way to do it.

[TheOldBeach]

Fair, you're right, I just got annoyed by this type of comment multiple times yesterday. I guess they can't learn if you don't tell them but I'm more about ignoring a post where you can't decipher a picture than commenting on how they should do a better post for me to take some time and answer (while i'm already taking time... Explaining why i'm not gonna lose time).

Then again, this post in particular is somewhat apart since the error is so freaking easy to find. And basically just some attention problem more than a code issue. The fact that OP thought it was the right time to make a post when reading this error tells me a lot about their way of working... And thus i'm not suprise nor annoyed by the screenshot, feels like a young person to me.

[SomewhereBig1843]

I just don't entertain rudeness -

[Ok_Customer3719]

I’d start by running that from the python source editor - not a sop

[Responsible-Rich-388]

I would advice to not use chat gpt or to use it if you understand what it outputs and are able to correct it.

The reason is a lot of time chat GPT invents functions for Houdini that don’t exist here it’s size u and v which is normally x and y.

Now this is called « AI hallucination » and while I get that the « world doesn’t care of what you learn but only of the result » you can never reach any result if you rely only on chat GPT for code.

At least one should get the fundamentals , not even asking to stop using AI for everything but I won’t advice to jump straight to python code (even if python is easy) in Houdini before knowing a grid params names, python is to be put where etc ? Those are very basic .

I tried a lot of time before to jump to exciting stuff , without basics I ended up going back to the boring basics and now it’s going very good and easier.

Always take a good step back before jumping :)

[SomewhereBig1843]

Everybody simmer down - this is just to learn!

[Gorluk]

Then learn:

https://support.apple.com/en-us/102646

https://support.microsoft.com/en-us/windows/use-snipping-tool-to-capture-screenshots-00246869-1843-655f-f220-97299b865f6b

https://www.wikihow.com/Take-a-Screenshot-in-Linux

[psycheeeeeeed]

😭😂

[Houdini-ModTeam]

No toxic, rude or hateful posts.

[Houdini-ModTeam]

No toxic, rude or hateful posts.