Unusual liquid particle movement HELP NEEDED

Anonymous

Unusual liquid particle movement HELP NEEDED

Anonymous
Not applicable

Hi to those on the forum reading this post right now! 

I am experiencing some very weird behavior with my liquid particles that I am simulating and was hoping someone out here might be able to figure out what the cause is. 

 

I am trying to create a scene where waves are lightly crashing against an object lodged into the shore of a beach. I've set up my simulation by creating a boss ocean and using the output as a motionfield for my liquid. Even though the ocean wind direction is a straight 270 degrees, and the motionfield direction magnitude to 0 (and zero'd out the xyz for good measure), my water particles keep moving to the right of the container I've set up! [Please watch attached video for reference] 

 

I have triple checked my geometry to make sure all the top vertices of the beach floor are level along the y-axis so I know its not an issue with the ground plane. Is there some setting that I am missing or need to turn off?? I am new to water simulations and have been working through various youtube tutorials.... I've been at this for over a month and I keep getting the same thing over and over again. I just want my water to flow back down the slope like it would in real life.... please help!!! 

 

Bifrost version 2.2.1.2-202106080857-835896f

Maya 2019 (student version) 

Windows 10 64bit

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Anonymous
Not applicable
Not sure if this helps at all but I've been following these specific tutorials:
https://youtu.be/OThS0plEv0A
https://youtu.be/RPKTQF8yur4

The only difference between my scenes and their scenes is the size of the geometry; mine being overall wider and a much smaller scale.
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syracoj
Autodesk
Autodesk

are you able to forward me your scene file? You can zip then attach it here.

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Anonymous
Not applicable

Here's the mb file, you might get some start up errors cause the cache and the textures wont be linked anymore. I changed some of the values from my initial posting as I was trying to figure things out but it's still behaving the same way. 

Appreciate any help you can give!!

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Anonymous
Not applicable

@syracoj were you able to figure anything out from the mb file? 

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syracoj
Autodesk
Autodesk

@Anonymous 

thanks for the scene file. Will take a look at it today.

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syracoj
Autodesk
Autodesk

 

I set all the colliderProp nodes Thickness attribute from 1 to 0 (under the conversion attribute group) on the node.

 

I also remodelled the collision geometry (“bottom_geo”) as well as Container_geo so that their polygonal thickness was at least 1 Maya unit thick.

 

I took the boss mesh that is being used as the 4th motionField and meshProp4 geometry input and did an extrusion on it to give it some thickness (at least 1 Maya Unit thick). Since I extruded I had to reposition it by moving it down so it was somewhat centred with the Bifrost liquid main body.

 

On the 4th motionField itself, even though it was greyed out, I turned on ‘Enable Additional Velocity’ then zeroed out the x axis Additional Velocity. After that I turned ‘Enable Additional Velocity’ back off. This step shouldn’t make any difference but I did it for good measure/just to make sure.

 

I also disabled all the meshProperties that were connected to motionFields that were not enabled. Essentially just leaving the motionField4 and meshProp4 intact since they are being used with one another.

 

In order to get this all to work I had to uncheck all the cache and initial state attribute groups to assure it wasn’t looking/trying to load a cache file I did not have.

 

After this, when I did a playblast, I could no longer see the strange particle motion moving along x as was seen before.

 

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Anonymous
Not applicable

@syracoj 

Thank you so much for your help!! That looks 10x better than anything I was getting! 

If possible, could you please explain how you went about finding this solution? Was this process of changing the colliderProps thickness attribute, having thicker geometry, having only one meshProp with a corresponding motion field (didn't even realize thats what the meshProp was!), and zeroing out the additional velocity  on the motion field all sort of "standard practice" when it comes to bi frost simulations like this? Or at least, when the scale is so small? 

 

As well, based on your solution, I'm assuming you can change the geometry of the colliders without having to unlink and relink them to the liquid node? Does this also apply for motionfields? Could I have changed the BOSS spectral wave output properties without having to creating a new motionfield? 

 

I'm very keen on actually learning the proper processes of building simulations and I want to try again from scratch following this advice so any answer would be appreciated! 

 

Once again, thank you very much for your help! 

 

 

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syracoj
Autodesk
Autodesk

When we set the collider thickness to 0 the resulting solid of the collider better fits the collision primitives geometric shape. Increasing the thickness adds additional offset padding to the geometric shape. So if you want it to match as close to the colliding objects geometric shape set it to 0.

 

If you open up the node editor and press tab/type: bifrostShape you can create another bifrostShape and connect the bifrostLiquidContainers solid output to its (new bifrostShape) object port. On the new shape you will want to set it to display voxels. The solid is the collider. If you switch the collision thickness from 1 to 0 you will see on the shape the change in the voxels in the viewport. This can give you a visual indication of what is going on.

 

For solid water tight collision geometry I try and model the collision objects thickness to be greater than or equal to at least 1 Maya unit (cm in Maya but the cm is interpreted in Bifrost Liquids as 1 meter) when I can. If I need something smaller than that then I use the shell mode rather than solid mode (also on the colliderProp node).

 

The motion field is taking the motion of the animated input mesh, which is fed through a meshProp node and then into the motionField and using its motion to kind of accelerate the particle fluid.

 

Zeroing out the additional velocity on the motion field was just a precaution. Even though it was greyed out (indicates it shouldn’t be used), I wanted to make sure that it wasn’t somehow (perhaps by way of defect) causing the particles to be pushed along the x axis because of this setting.

 

You can change any of the prop nodes or colliders by rewiring them in the node editor.

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We use StackAdapt to deploy digital advertising on sites supported by StackAdapt. Ads are based on both StackAdapt data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that StackAdapt has collected from you. We use the data that we provide to StackAdapt to better customize your digital advertising experience and present you with more relevant ads. StackAdapt Privacy Policy
The Trade Desk
We use The Trade Desk to deploy digital advertising on sites supported by The Trade Desk. Ads are based on both The Trade Desk data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that The Trade Desk has collected from you. We use the data that we provide to The Trade Desk to better customize your digital advertising experience and present you with more relevant ads. The Trade Desk Privacy Policy
RollWorks
We use RollWorks to deploy digital advertising on sites supported by RollWorks. Ads are based on both RollWorks data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that RollWorks has collected from you. We use the data that we provide to RollWorks to better customize your digital advertising experience and present you with more relevant ads. RollWorks Privacy Policy

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We can access your data only if you select "yes" for the categories on the previous screen. This lets us tailor our marketing so that it's more relevant for you. You can change your settings at any time by visiting our privacy statement

Your experience. Your choice.

We care about your privacy. The data we collect helps us understand how you use our products, what information you might be interested in, and what we can improve to make your engagement with Autodesk more rewarding.

May we collect and use your data to tailor your experience?

Explore the benefits of a customized experience by managing your privacy settings for this site or visit our Privacy Statement to learn more about your options.