Agent interacting with Pop Grains

[FA1LURE]

Hello everyone,

First time poster. Coming from a C4d / Realflow background.

I have been able to accomplish what I am trying to do with regular objects as a sphere or a cube lets say.

I downloaded a zombie crawl from https://www.mixamo.com/#/?page=1&query=zombie . I imported the fbx into an agent and added an unpack node under the agent as I read this was the only way to be able to get it to react with RBD / Fluids etc.

My scene consists of a cube with a transform on it to make it a rectangle which I applied a wet sand preset. The rectangle is above the imported fbx zombie. I have a ground plane. I tried making the zombie a RBD and I also tried making it a deforming object.

The goal is to sim to grains with the zombie in place (I removed the $T animation channel). Once the grains seemed to be settled and looking like a nice pile of dirt, I spit out an initial_state.sim file. I added the to my dop network. I then selected the zombie and clicked on Awaken by Geometry. I also turned on Enable auto sleep and Start asleep on the pop solver.

I am having several issues.

I would like once I have my initial state, for all the particles to be frozen or "asleep" unless the zombie interacts with them. Also I was to be able to control the velocity of how his movements affect the particles collisions... and those particles would in turn AWAKEN more particles etc.

I can not get any of those to work.

I searched every post on the forum with grains. I learned a few things from Rohan Dalvi's tuts. So I am kinda stuck and hoping someone could help me out.

I have attached the latest iteration of where I am currently (stuck).

Let me know if you have any questions on my end. I just recently bought indie and redshift and loving it so far. Still wrapping my head around attribute wranglers and vex, but one day at a time. Thanks guys!

William

 

grains_zombie_crawl_006.zip

Edited July 15, 2018 by FA1LURE

[FA1LURE]

I actually rebuilt it and its working now.

Is there a way to have the animated character exert a velocity value?

I would like to be able to control how much its movements make the grains move etc.

Any help would be sick.

 

Thanks!

[FA1LURE]

You know I actually had it working after I rebuilt it and it just stopped working all of a sudden.

I'll try to redo all the steps again to see if I can post a working version and maybe you guys can tell me what im doing wrong or if there is a method that you have used in the past that you works.

[FA1LURE]

Ok.

So I rebuilt everything with the little knowledge I have of Houdini atm.

Hoping someone can point me in the right direction.

Here are three sims that are pretty much identical for the most part.

I am curious as to other experiences as approaching something this this workflow wise.

As stated before, the grains are being emitter from a rectangle and once they settle enough I spit out an "initial_state.sim"

The I turn on the Pop Awaken node which is referencing the animated geo. I also sleep the particles in the popsolver.

The re run the sim. I am happy for the sole purpose that I was able to get it to this point. But this not good at all imo and there are so many things that I want to have in there, but I have yet to find any information online that goes in depth to pop grains.

I would like for the sim where the mocap is crawling through the dirt, I was thinking of it as a zombie coming out of its grave type of thing.

 

Any ideas on what I can add or tweak settings wise.

Here are the three scenes attached.

Let me know.

 

Thanks!

 

 

 

 

 

 

 

grains_change_direction.hiplc

grains_soccer_tackle.hiplc

grains_zombie_crawl.hiplc