Hi!

I'm making a Heightfield HDA. I would like to add a Heightfield_Paint sop inside. Currently, when I select my HDA, go over the viewport and press Enter, I don't get the paint brush tool (obviously). How can I get the paint tool to "activate" when I press enter (or click on a button?).

Hello. There's a simple method to get it working with Enter key. You're not going to need any additional buttons with python callbacks or nothing like that. We can utilize default state option in type properties but with a few more steps.

1. Allow editing of contents on your HDA
2. Open Type Properties
3. Under Parameters, drop in a Folder. Under Parameter Description, set its Name and Label, then change Folder Type to "Import Block"
4. Scroll down to "Import Settings" and toggle it on. In Source field, type "op:heightfield_paint1" (or whatever you named the node for example op:PutExactNodeNameHere)
5. Under Existing Parameters, enable toggle "Show Invisible Parameters". On the right hand side from that toggle is a cogwheel, click on it and, on its dropdown menu, tick "Promote Invisible Parameters"
6. Click on cogwheel again > Refresh Imports. It will promote all heightfield_paint1's parameters one level up (to HDA's level).
7. Now go to Type Properties > Node and set Editable Nodes to "heightfield_paint1"
8. Set Default State to "sidefx_stroke". I found that this default state doesn't throw any errors but it unfortunately doesn't project the brush onto the heightfield. Even though it won't project the brush in the viewport, heightfield_paint node will still preserve its functionality to project the stroke curve's points onto the heightfield.

I've appended an HDA so you can compare the settings. I hope it helps!

Fantastic!
Thanks for taking the time! Work very well!

Ah, one last thing. What If I need 2 paint nodes so I can paint 2 mask affecting different things?