This is driving me nuts.. in the polyextrude node I have been trying to select the boundary edge group that is being outputted by the particle fluid surface node for almost 9 hours now and I just can't find a way to select it. I have tried everything I can think of but I can't get it to select from the viewport or Tree view. Please help me.

No file or image to show the problem, no honey :-)

Please attach an image which shows what is going on,
and if possible, attach the file with the problem.

Sure no problem. Here is the video and the time stamp for the relevant portion of the video where he is explaining the boundary group being polyextruded

It is at 1:48:52.

https://www.youtube.com/watch?v=n5jkDII4Sbc&t=6527s [youtube.com]


edit: I tried to upload images but it won't accept them. The part I want to know about is very clear in the video at the time I referenced. In the poly extrude node there is a “group” field. I need to know how to select the “boundary” group that is selected in the example.

Do you convert geometry from “poly soup” to “polygon” before extrude?