what is the meaning of the expression in the sop solver example? Thank

[maphysart]

I try the dentingwithpop sop solver example hip in the help file. Inside the dopnetwork solvergeo, there are two expression I can not understand.

1st. in the copy_per_impact node:

dopnumrecords("../..", stamp("../OUT", "OBJID", 0), "Feedback", "Impacts")

2nd in the merge_dop_object node:

`stamps("../OUT", "DATAPATH", "../..:dentme/Geometry")`

so what is the meaning of OBJID? I am confused because the OUT is only a null node. It does not have any attributes or parameters called OBJID. Besides, What is DATAPATH? I could not find it in the global or standard variables. Futhermore, why use ../..: , what is the meaning of ":" ?

Thanks a lot. I hope you can give me some hints.

[michael]

there is a help card for the sopsolver - and at the top it describes what OBJID is

the rest is houdini's path syntax - also described in the documentation

[maphysart]

Thanks a lot to Michael.

I found DATAPATH and OBJID, and know more about Sop solver. They are global parameters, so I did not find them in the OUT node.

But there are still some questions:

I add a float parameter in the copy_per_impact node within geosolver sop network.

and put in

`stamp("../OUT", "ST", 0)`

I wish to get the simulation time from the dent outside this sop network. But it did not work.

Besides, I searched "path" or "path syntax" in the help doc and found nothing. Could you or anybody give me more detail about the path syntax? Thanks .