there's absolutely no simulation there though

I mean procedural built. 😊

that depends on whether you want geo to be displaced in the direction of normals or only on the axis that you need, you can try using displace and see whichever works best for you.

I'm afraid not: my hard drive died since then, so I've lost lot's of data including my houdini projects.

Heyo, seems like you've made a mistake in the expression you've put in there. Maybe missing a bracket, or a coma.

you're missing the value ranges for it, the correct syntax is fit(rand(@ptnum+255),0,1,xmin,xmax)

You could also use fit01() instead

Side FX Houdini, it's in the title ^^`

Depends if you want a variation in that direction. You can use Zero Centered Perlin to go both ways on + and -

@@BizarreSelfProduction OK , i try , thx

I'm sure you will be able to do it yourself, the whole script is quite short and straightforward)

During the tutorial I've stopped on the nodes that have the key features resulting the the desired effect. Like "copy stamp" and "attribvop" for the noises. All the rest are pretty much the same as default values. You can also check out the icicles tutorial as it has the same approach but I go over every single node.