Oct. 20, 2017 06:13:29
having run through two different tutorials that that both stick particles to a surface using vops, one does it in dopnet and the other in a Sop network. I tried to swap the particular vex processes but ran aground.
Inside the vopnet with some of it's ICE style familiarity i can see what goes on but I realise I'm actually lost regarding the multiple types of vops and how they work in different places like a sopnet or a dopnet.
Why so many different vops? why not just one if it's just driving vex under the hood? What's the difference between an attribute vop a point vop or a pop vop for example?
Why are some vops available in some places but not others? Why can i not have an attribute vop inside a dop network?
Last question, why does a vop laid down in a sop net have 4 inputs but one laid down in a dopnet only have one?
Plenty of doco/tutorial stuff for specific task but not much for overall joined up-ness.
N.B I added the hip file with both tutorial setups just in case.
Oct. 20, 2017 07:20:46
i dont have an easy answer for you.
I also think this can be quite confusing.
And i think a lot is changing(has changed) with regards to this.
As you see at the bottom of this page:
Define a custom SOP operator with a program that edits geometry point attributes.
So some of the stuff is legacy…
“pops” are now part of “dops” (n H16)
this was not yet the case.
hope this helps a bit.
And: I only started learning Houdini 4 years ago. And it was so frustrating:
- i read about vex compilation and other stuff
- and when i found out about vex wrangles i was sooo happy.
Oct. 20, 2017 10:59:11
it's a steep climb for sure but the view will be worth it.
Oct. 20, 2017 12:27:20
I'm just a beginner myself, but I'll try to share my insight.
in SOPs, a Point/Primitive/Vertex VOP is just an Attribute VOP with the Run Over parameter already adjusted for the type you want to change. it's just a shortcut.
other than that VOPs are going to behave a little different depending on the context, like if you put down a Volume VOP you gonna get density attribute to work with out of the box.
in DOPs I'm not too sure what the differences are, but from their name - Geometry VOP, Gas Field VOP, POP VOP, VOP Force - you can have an idea, and all of these work on the Dynamics Context, so considering the previous frame, simulation time, relationships, etc
I agree it's a bit confusing.
May 16, 2021 06:36:29
I am a learner, I'm quite confused about what is the difference between vopnet and attribute vop .
I have gone through different pages and I got to know about different attribute vop but I am unable to understand what is the basic difference between vopnet and vop