I am creating an hda (otl) that I would like to add paint sop capabilities to. Does anyone know how to do this?

In type properties I have set the Default State to paint. This works as far as it prompts me in the view port with painting instructions, but I am not getting a brush.

In order to use the paint capabilities of the node, you need to enter the state of the node.

One way to do this is to select the node even though its inside the HDA. In order to do this, create a button name it “Paint”, in Type Properties>>Parameters>>CallbackScript for the button type in hou.pwd().hdaModule().node( “nameOfThePaintNode” ).setSelected( True ) and switch language from Hscript to Python and in Type Properties>>Node>>EditableNodes type in the nameOfThePaintNode

So now pressing the button should enter the state of the paint node and let you paint!

Hi MrReedSmith,

If you cant please explain,

Can you tell me when you use the term hdaModule()?

I am a beginner in Houdini.

I can see that you have written hou.pwd().hdaModule().node( “nameOfThePaintNode” ).setSelected( True ) but in the screenshot it is
hou.pwd().node( “paint1” ).setSelected( True )

Thank you

I put this on my callback script (python)

I got this error message

SyntaxError: ('invalid syntax', ('<stdin>', 1, 28, ‘hou.pwd().hdaModule().node(\xe2\x80\x9c./paint_zoneID\xe2\x80\x9d).setSelected(True)\n’))

I´ve used this way, it´s really cool, just need to make suro the params in your topNode follow houdini conventions

https://www.sidefx.com/docs/houdini/nodes/sop_state/stroke.html [www.sidefx.com]

Gerardo Castellanos
I put this on my callback script (python)

hou.pwd().hdaModule().node(“paint_zoneID”).setSelected(True)

I got this error message

SyntaxError: ('invalid syntax', ('<stdin>', 1, 28, ‘hou.pwd().hdaModule().node(\xe2\x80\x9c./paint_zoneID\xe2\x80\x9d).setSelected(True)\n’))

I just got this error too Turns out it's the forum's fault - if you look carefully you'll see the quote marks in the snippet you cut and pasted are “smart quotes” - 66 and 99 - rather than good ole' fashioned code quotes. Delete them and retype them.

But besides that, I also had to remove the hdaModule() bit.

Depending on what your HDA needs to do, you probably need to move the display flag to your Paint SOP too, so my callback ended up looking like this:


… plus I had to add a similar button to “finish” painting and move the Display flag back to the end of my network again.

For those still struggling, check this attribute paint masterclass at 54:00 https://youtu.be/gAT8ueaKAvs?t=3243 [youtu.be]