I knew I was missing something, just didn't know it was something so obvious
I feel a bit dumb now, but that makes me want to learn more so I guess is a good thing.

Thank you mister Edward for your help!

Good day everyone,

I have been checking on Max Rose's tutorials and other incredibly useful material online regarding APEX.
I am currently trying to rig, skin and animate a simple walk cylcle of a proxy spider to be able to then use it in a very simple crowd system.
Nothing complex so far, but I am getting stuck on the Bone Deform phase using the Autorig Component.
I believe I am not doing something correctly, but the skeleton is there, the mesh is there, the guide skeleton is there...

When I hit ENTER on the bonedeform autorig component, I can't see the mesh even though I promote everything. And of course, it doesn't deform the geo.

If someone could give me a hand with the scene uploaded it would be really appreciated.
I included everything in the zip file, and using H 20.0.688 for this.

Thanks y'all!

Hi everyone!



I have been working on this all day but I can't quite find the solution!

I am doing something easy in my mind but quite tricky when animation comes into place:

1- Create a velocity field with a curl noise around a geometry
2- Generate a smoke sim from the same geometry
3- Make a popsim where I blend the advection between the two different Vel fields (curl first, then smoke after a @age threshold is reached).

So far all good.
I have been testing this on a static guy and it works.
The problem is that I can't find a clean solution to make it work when the character walks in space. As soon as I do that (obviously) the curl noise starts swimming into world space and the particles start losing the advection.

I thought about using a point deform for the curl noise points inside a sop solver in the pop net but it didn't work.

Does anybody have any weird and amazing solution to this?

Please check the file!

THANKS!

Hey everyone,

just stumbled upon this book on amazon.jp https://www.amazon.co.jp/o/ASIN/4862463592/bdbooks-22 [www.amazon.co.jp]

I managed to obtain some parts of it and I must say it's very good book and not just for beginners.
It has many interesting pages on SOP and VEX lands and actually I made me spend quite some time trying to translate it as I was really really interested.
The lack of books about H is well known so I kept wandering around the japanese amazon website, and it's literally full of them!

Now, I am not sure if this is something I could call a proposition for a tutorial, hell I am not even sure this post will have any use, but I was hoping that maybe, just maybe, SESI could push this info to some international editorial and have some of those books translated or something. It shouldn't necessarily be free, as Japanese people pays for those books of course, but still it would create such a tremendous resource for learning, teaching etc etc.

Any thoughts?

You just need to enforce it as a vector ramp and then use any attribute to control such as @P @v @N @pscale @id and so on.


There are already different topics where this has been answered tho, so I suggest searching in both forums before opening another one if you don't wanna risk to not being answered :>

Oh boy, quite tricky indeed. Basically the problem seems to be retaining an attribute that acts as i@id would but for each independent “set” of patterns. So fare none of the attributes existing in those points work with that logic.
I've tried to find a way to let them inherit the id from the input geo but, as that one is constantly changing, I couldn't.

I am afraid I am a bit lost right now, probably a bit more digging could help, but for now Ben's method is not giving you any way to connect points with an attribute out of the box.

Hopefully somebody more skilled than me in coding will jump in and solve this one!

mestela
Sort of works, might give you some ideas…

There you go, “magic Matt” just gave you what I think you were really after then!

Adriano

Cristotek
I am currently in Lisbon so I think you'll read this on your tomorrow but anyway:

if your quest is having points/particles following a predefined path then you might be better off using sops method actually.

I am no H-guru by any mean but from my experience, to have that geometric path being used as a path in POPs you'd probably have to dive heavily into VEX inside a POP-wrangle. But even then I doubt you would get anything really controllable, especially if you want to have the ability to alter your pattern and have everything still following the paths. Plus I think the speed of such POP sim wouldn't be ideal (I could be wrong here).

So I've made a simple and quick setup which creates a super easy pattern and extracts points form each line. The rest is the magic of carve+modulo.

Hope it helps

Thanks a lot Christotek, much appreciated that you dug into the topic

You are welcome even if I didn't help much eheh…
Happy you found a solution in the end, and pretty neat result too!
Keep us posted on the final outcome if you can!

I am currently in Lisbon so I think you'll read this on your tomorrow but anyway:

if your quest is having points/particles following a predefined path then you might be better off using sops method actually.

I am no H-guru by any mean but from my experience, to have that geometric path being used as a path in POPs you'd probably have to dive heavily into VEX inside a POP-wrangle. But even then I doubt you would get anything really controllable, especially if you want to have the ability to alter your pattern and have everything still following the paths. Plus I think the speed of such POP sim wouldn't be ideal (I could be wrong here).

So I've made a simple and quick setup which creates a super easy pattern and extracts points form each line. The rest is the magic of carve+modulo.

Hope it helps

Yep! You were right, I was keeping everything into one constraintNet, and that was indeed the issue (plus that thing about updating it after frame 20)!

Well, kinda silly as an error but thanks so much for taking the time man. Now I just gotta find a nice controllable way of breaking those connection like saliva would.

Cheeeeers

If there's anything I can improve on my post description please let me know as it seems this is going unanswered for a bit now
Cheers all

Hey all

kinda long title, also not a new topic but scavenging around the forums I haven't find a solution yet so here it is:

I have a rbd sim with a sphere splitting in two. When the parts split I have a wire sim connecting few points to create some some sort of slime-ish filaments (remeshing them afterwards of course).

I've got the wire sim working fine with both rbdpinconstraint and rbdspringconstraint but I can't seem to use the nice and dandy approach of adding a sopsolver to the constraint network to break them according to either force, distance or torque. That's because, on the constraint network the “override with sop” value is (and has to) set to one in order to update the constraint position being fed in the dop net.
So I am kinda curious to see what you guys come up with to solve this small issue…
I've thought of using sbd spring constraints but I'm unclear how could I create the same behaviour for many wires and on many points depending on stretching values, but maybe I am missing something simple.

Thanks all, here's the hip.

Hey all, sorry for disappearing.

Just wanted to say thank you to mister Goldfarb for those tutorials he's posting. When I started this thread I wasn't expecting all this success and, even though I know for a fact that SESI had those on schedule already, it was absolutely mind blowing seeing how closely Michael followed all our suggestions.

So that's it, I am following very closely all the tutorials that are coming out and I can't wait to watch the new ones Michael is still doing!

Thanks again!

arctor
you should start seeing them before Christmas.

I will be patiently waiting for it under the my node-tree

arctor
I'm basically doing this tutorial (that was recommended to us) but in Houdini :
https://www.3dtotal.com/tutorial/1836-maya-rigging-introduction-to-rigging-by-jahirul-amin-animation-character-vehicle [www.3dtotal.com]

Yep, I am looking forward to see that one! Do you have a rough idea when it will be nice and ready?

Thanks

Sergio Peixoto
Also would love to see some in animation, and more specific ways to automate movement like for example, using procedural simulation on the rig to form natural movements like in the example below
https://www.youtube.com/watch?v=mUmWFgwhUII&list=PLDC5PFurDN8d4GBuPjj3j9ZLzUn6zW5p0&index=63&t=1213s [www.youtube.com]

What the guy is doing on Maya is something very basic to setup. He's just applying a sine function to an attribute that controls the spine twisting of the creature. You can easily do that just adding a parameter for the rotations you want to change and apply some out-of-the-box MotionFX right-clicking on that channel

arctor

powerstroke3000
if the recently released rigging training was the one that was mentioned in this thread

Bjørn's Cat rigging series is not the one that I'm doing right now.

very happy to hear this! Although that series is a very good introduction to new and old rigging ways I am thrilled to see what sesi staff can pull out!

Thanks for the hard work arctor!

I'd suggest you the Bullet constraints route for that.

yeeep, wedge rop eheh, typo!

Well, thanks for all the explanation!

Hey galagast, thank you so much for the help!

Right after I wrote this post I went out and suddenly it stroke me on the bus the idea of using the wrangle rop. I felt so silly for not having thought of that before!
As soon as I came back home I saw your reply and started digging inside the scene, such a nice little setup there! Thank you very much for sharing that. I did not get a couple things that I'd like to ask you:

1- why does the “get_points” wrangle works only if you plug the animated bottles in the second input? I mean, I see that the code looks up at the second input obviously, but when I tried using the 1st input and changing the vex snippet accordingly it did not work.

2- on the file sop that reads all the caches in loop, you had detail(-1,“iteration”,0). It worked fine in your scene, but it kept giving me errors on my end. I replaced it with the relative path of the metadata node and it worked. I didn't understand why

3- the measured volume was giving me negative values D: I had to do a *(-1) after to have it positive, but still gave me a very low value compared to the volume I was expecting to have (imagine it gave me a 3 when it should have been a 7 for example)

Apart from that, everything works perfectly and the scene/sim is very very light and RAM friendly, so thank you again!

Hi everybody,

I am trying to get a “simple” idea to work but I am not managing so far.
What I am trying to do is:

1- A bullet simulation of a bunch of bottles in a box, sliding on the surface (the easy part, done).
2- Grab that cached animation of 56 bottles and use it for a relatively low-res FLIP sim.

The main problem is, obviously, get the fluid contained inside the bottle following the cached animation.
I have added already tried all the things that I know of: increasing the vdb collision thickness (both sourcing a vdb from SOPs, and using houdini's own volume collision representation), decreasing the vel-grid size, up-ressing the sim, using more substeps (both adaptively and “brute force”, swapping collision method to “Fast-moving Colliders”, changing the every detection method, changing the scene scale, changing the solver scale and so on. Seems like no matter what I do the fluid keeps leaking outside the bottles, even if the collision guide of my FLIP Object shows correct representation of the mesh. My animation is not even that fast, so I am really scratching my head here. Hopefully someone can get it to work somehow.
Also, if I were to increase the thickness of the collision volumes they would, obviously, cross and intersect with each other at some point, creating holes where they intersect which we obviously don't want.
So my final question here is: is there any way to sim this all in one go? Because the only other option seems to be simulating 1 bottle at the time *56…which is a route I would rather not take…

I am posting the simplified version hip, thank y'all