Hello

What I want to do is really simple but I couldn't solve it because I'm a beginner. To tie the ship to the land with a rope. I create an obi solver and tie the ship. The ship is big and has a high volume, about 700,000 mass. When I move the ship, the rope constantly stretches and doesn't hold the ship. I couldn't figure out what other settings I should make and what I'm missing.

I switched the one that attaches the rope to the boat to dynamic. The one on land is static. other settings are default.

I'd be glad if you could help.
Thank you.

Hello. I am using the latest Obi Fluid 7 with Unity 2022.3.43f1.

I noticed that when running a script with the following code while the Backend mode of the Obi Solver is set to GPU, performance deteriorates. Regardless of the processing inside the Solver_OnCollision function, simply registering a function as an event listener to .OnCollision causes a performance drop.

Example:
void OnEnable()
{
    if (solver != null)
    {
        solver.OnCollision += Solver_OnCollision;
    }
}

void OnDisable()
{
    if (solver != null)
    {
        solver.OnCollision -= Solver_OnCollision;
    }
}

private void Solver_OnCollision(object sender, ObiNativeContactList e)
{

}
However, when the Backend mode is set to CPU, the impact on performance is minimal.

Why does this happen?
Is there a way to use GPU Backend mode without causing a performance drop while still using this script?

New component coming to ObiRope 7.0.5: ObiPinhole.

This is something that has been requested quite often: the ability to attach a rope to a point while allowing it to slide/pass trough that point - just like a thread passing trough the eye of a needle.

Pinholes implement that and a lot more: they have full two-way coupling with rigidbodies, they're motorized, and you can even define the friction between the rope and the pinhole. They work for ropes and rods, both open and closed/looped, and fully support rope tearing/cutting. Here's the WIP manual page for them, which contains more details and some use cases:

https://obi.virtualmethodstudio.com/manu...nhole.html

Let me know if you have some feedback, questions or suggestions!

Hi,

I need to track the the transform of cloth particles or specially 2 individual corner particles who I have assigned Particle Group named lets say "Left Corner Particle" and "Right Corner Particle".

Is there is any way I can fetch the transform using Particle Group?

Hi,

I am using Obi Fluid 7.0.4 in Unity 2023.1.3f1 with Universal 2D, and I encountered the following error message:

Hi,

I am testing collision between Fluid and cloth. 
Works fine between ObiCloth and ObiFluid, but when switching to ObiTearableCloth, fluid doesn't collide anymore with Tearable cloth. Do I need extra setup for collision to work ?

thanks,
Diego

First off, I just want to say how amazing Obi Fluid is! I've had so much fun creating various liquids for my projects—huge thanks for the fantastic work. Keep it up! 

The Issue:
I initially ran into an issue with the compute backend struggling when handling a large number of colliders in the scene. The fluid wouldn't collide with anything, but I found a fix on the forum by adjusting:

• Colliders: ~150 (mostly Box Colliders), positioned close together.
  
• Fluid Resolution: 3
  
• Particle Count: Around 185k particles—at this point, the fluid starts ignoring colliders and becomes jittery.
  

1. Instability at High Particle Count
   • Even with a high-end GPU, the compute backend becomes unpredictable when the particle count increases.
     
   • Reducing the resolution only delays the breaking point.
     
2. Collisions Causing Jitter
   • The fluid behaves erratically when colliding with many objects, even with particle count around 100k.
     
   • This jitteriness leads to excessive foam generation.
     

1. Jittering Fluid at High Particle Count 
   demo
   
2. Fluid Passing Through Multiple Colliders
   demo
   

Hi, in my company we have Obirope asset and i have a few problems setting it up.

We have overcomplicated vr setup using MetaXR sdk. Obirope 7.0.3, burst solver. 
There is image limit on forum so i uploaded it here. In Editor it looks ok (attachment 1. Cables in editor image),
but when app is built and run on quest2 cables are not snapped in place(attachment 2. Cables on the device).

Attachments 3-7 show my in editor setup. On image 4 control points on the edges collide with noting. Image 7 shows attachments that are set up on both sides of rope.
Stuff is connected to each other using meta SnapInteractable to SnapInteractor connection creating ”chains” of objects (they must be coupled/decoupled dynamically).
I also tried to write custom script for forcing renderable position into target Transform position. Sadly there is no visible change on the device.

Another issue is that I have problems with setting up rope as cable so it will behave more like cable, not like rope. Any suggestions?
And fps drop (-20fps) but I assume it's caused by multiple ropes, for now I just want rope endings to attach. 

Please let me know if I can specify something more or you need any additional information regarding my setup.

I'm working on this scene where I have a chain that is connected to 2 hooks. Both particle attachments are set to static. In the first attached image "Editor Setup" you can see how the setup looks in the editor. When I run this scene, the green mesh rotates downwards (due to the rigidody and hinge components) and we get the second image "Scene Running (Static)". Up until now everything is behaving as expected. 

Since I want the amount of strain on the chain to influence the rotation of the bottom hook (green mesh) I make the bottom particle attachment dynamic (and add the needed obi collider and rigidbody components to the bottom hook). When I don't change the settings of the chain, running the scene will lead to very erratic behavior: The chain immediately disconnects and all the components just start shaking uncontrollably (seen in image 3 "Dynamic No Changes").

I then tried modifying the chain constraints but it always results in a chain that doesn't have enough strain on it and that doesn't connect to the the mesh properly (as seen in image 4 "Dynamic With Stretch Compliance").

In the fifth attachment "Constraints" I have the constraints I used for the static image and the dynamic one + the Obi Solver settings. I tried tweaking every possible constraint to get a working dynamic attachment but nothing has worked. Any ideas what I could possibly be doing wrong?

Thanks in advance!

Attached Files

Thumbnail(s)
                   

Hello!

Using Obi Rope, I'm trying to make a simple system where a rope is connected to a wall (attachment pin), and to an object that the player can control (another attachment pin); both of those static. I want to make sure that when the object moves away from the wall attachment, the rope gets longer, and when it gets closer, the rope gets shorter. I'm using a cursor, and I tried a few different solutions, but I couldn't get it to work. Here is the current code: