Hi all,
I'm writing because at work I'm taking over someone else fx asset
to setup vehicle fluid sim and I'm not really into DOPs my self
and having some problem in understanding some of the concept in there…
Especially for some of the node like “Gas Particle To Field”.

While is clear what they are meant to do, isn't really clear how they got setup.

For instance I have:

Destination Field: “vel”
Particles: “Geometry2”
Attribute: “v”

While I understand all of those channel, I do not have any idea
why the channel “Particles” have the string “Geometry2” in there and thats it…??

I understand it should point to at least a sop or pop node where the particle system lives
or there should be somewhere a node or a obj or a geometry node call “Geometry2”???

Can you turn on some light on this?
I can not find any “Geometry2” around the network none in any sops in the scene…is this a mistake or is “Geometry2” a kind of keyword or reserved keyword I can use to refer to something like a predefined channel/name or whatever it has to be?

Many thank you
A.

alexnardini1
Hi all,
I'm writing because at work I'm taking over someone else fx asset
to setup vehicle fluid sim and I'm not really into DOPs my self
and having some problem in understanding some of the concept in there…
Especially for some of the node like “Gas Particle To Field”.

While is clear what they are meant to do, isn't really clear how they got setup.

For instance I have:

Destination Field: “vel”
Particles: “Geometry2”
Attribute: “v”

While I understand all of those channel, I do not have any idea
why the channel “Particles” have the string “Geometry2” in there and thats it…??

I understand it should point to at least a sop or pop node where the particle system lives
or there should be somewhere a node or a obj or a geometry node call “Geometry2”???

Can you turn on some light on this?
I can not find any “Geometry2” around the network none in any sops in the scene…is this a mistake or is “Geometry2” a kind of keyword or reserved keyword I can use to refer to something like a predefined channel/name or whatever it has to be?

Many thank you
A.

Geometry2 refers to name of geometry data in DOPS. The name really could be anything since you can set the name of all custom data. The particle string basicly tells from what DOPs geometry data houdini will find the attribute to transfer into a field.

If you open your details view and expand it. You will find what data you got in there.

1. Here I´m importing geometry and set the DOPS data to be called geometry2.

2. Details view of my data.

Hey mawi,
thank you very much for your reply!

It does make sense but still there is something I dn't get.

I understand now that that string can have any string in there
to name that data but based on what the help says:

“Particle: The geometry whose point attributes will be copied to the destination field.”

It make me think somewhere else, and you make me point to the fact that somewhere else should be within DOP world, it must exist some geometry data call “Geometry2” from where I'm grabbing it's point attribute? In my case “v” into “vel”??

Is it correct or am I still missing or not getting the point ?

many thank you for your help.
A.

Ok, never mind…I got it…thanx God!

There is a “SOP Geometry” node from where he was importing
some points into DOP with “v” attribute and
with the “data name” set to “Geometry2”…got it!

This is from where he is grabbing then the point attribute with Gas Particle To Field…

Thank you, I was looking everywhere for this “Geometry2” but not within DOP!..it does make sense and very very handy!

A.