I have a basic grid setup that I have altered its Y axis with noise expression to create some bumps in a point sop. And at the end, I added a smooth sop to toned down the spikes.

What I want is to offset an object above surface no matter where it travels. So I copy and paste the noise value from the grid stream and into object's point sop. Now, since I have a smooth sop at the end of the grid stream, the object is not following along correctly…

So I would like to know how should I get the new Y axis value so my object would follow the the smoothedout-noised-grid better.

Please share what you think or correct what I might have done wrong, thanks!

You should have a look at the ray sop.

http://www.sidefx.com/docs/houdini13.0/nodes/sop/ray [sidefx.com]

Thanks, badhairday! Ray looks like a nice tool to play with! D

Though do you think I should export the grid geometry as .bgeo or obj. and re-import back it in order to have it worked with the ray sop?

What I wondered is the possibility of manipulating point value after smooth sop applied. Or smooth sop should always come after all the changes? I am trying out noise function with point sop and came up this question.

I will try more when I get home, thanks again!