Dear Developers,
I have encountered a bug related to particle sleeping, which has caused significant issues in my application scenario. As demonstrated in the video, I initially set the sleep threshold value to 0.5. When particles are emitted at a low height, they correctly enter a sleep state. However, when the emission height is increased, the particles fall to the ground and exhibit slow creeping movements. At this point, I have to increase the sleep threshold to 10 to get them to sleep. The higher the velocity the particles experience during activity, the harder it is for them to sleep, which seems unreasonable.
My particles have a relatively small radius of 0.01m. However, this issue also occurs with larger particles, such as those with radii of 0.03m, 0.05m, and 0.08m. Could you please explain why this happens and how it can be resolved? The burst solver back end also shows this issue, although to a lesser extent.
I look forward to your response.
Best regards,

bug video：↓
https://www.bilibili.com/video/BV1kebHec...782833d31a

hi!

①
I see multiple variables about particle coordinates in IkSolver. They are: positions, restPositions, prevPosition, startPosition.
What is the specific update time for them?

②
In my case，I used two rigid bodies to try to lift the soft body.
Since I can't lift the soft body directly through friction, my design is to use collision detection to update the positions of the particles on the contact surface, so that the outer wall of the soft body is lifted by the rigid body.
For example, as shown in the following code, when OnObiCollision, the y component change of the rigid body is provided to the colliding particles. Although this implementation can make the soft body shake slightly, it still cannot be lifted completely.
If my code implementation is correct, I don't quite understand this problem. In my code, shouldn't the contact surface of the soft body be completely at the same height as the rigid body?
   

Hi everyone,

I'm having trouble with the Obi Cloth asset in Unity. I'm trying to fit a 3D shirt model onto a 3D human model, but the shirt behaves unpredictably and appears to explode.

Details:

- Unity Version: 2022.3.3f1
- Obi Cloth Version: 6.5.4

Setup:
- A human model with MeshCollider and ObiCollider
- A shirt model with ObiCloth, ObiClothRenderer, and a correctly assigned blueprint
- ObiSolver with 8 substeps and Max Depenetration set to 10

Problems:

The shirt tears and looks like it's exploding, even when initially not colliding with the body.

Error Message when Generating Blueprint:

NullReferenceException: Object reference not set to an instance of an object
Obi.ObiActorBlueprintEditor.Refresh () (at Assets/Obi/Editor/Common/Blueprints/ObiActorBlueprintEditor.cs:416)
...


(But I can click on Edit and see the particles of the shirt).

I've tried adjusting physical parameters like Stretch Compliance and Bend Compliance, but without success. Does anyone have any idea how I can fix this issue?

Thanks in advance for your help!

Hello,
I have recently tried out the new grid-based fluid renderer and it looks fantastic, very captivating. Now, I would like to extract the mesh from a specific frame. There are many interesting things that can be done with this mesh, such as freezing it and setting it as a mesh collider. The possibilities are quite exciting to think about.
So, how should I go about doing this? How can I extract the mesh from a specific frame and turn it into a prefab, etc.?
Thank you!

Hello,
Thank you very much for the tremendous effort you put into Obi 7. I have obtained the custom package for this version. However, I have done a lot of work using Obi Fluid 6.5, and I have projects in the older version. How can I quickly update these projects to Obi Fluid 7 to avoid redundant work? When I tried to directly import the installation package and overwrite the existing one, many errors occurred.

Hey,



I'm getting this import error. In my previous post things worked, then I tried importing a different obi product (obi fluid) and something got corrupted causing errors that won't self-resolve.



https://imgur.com/a/ud40C13





When deleting/re-importing I keep getting this error, for either or both:

Just testing out your example scenes in empty iOS project in Unity 2022.3.36f1

DllNotFoundException: libOni assembly:<unknown assembly> type:<unknown type> membernull)
Obi.OniBackend.CreateSolver (Obi.ObiSolver solver, System.Int32 capacity) (at Assets/Obi/Scripts/Common/Backends/Oni/OniBackend.cs:17)
Obi.ObiSolver.Initialize () (at Assets/Obi/Scripts/Common/Solver/ObiSolver.cs:883)
Obi.ObiSolver.AddActor (Obi.ObiActor actor) (at Assets/Obi/Scripts/Common/Solver/ObiSolver.cs:1148)
Obi.ObiActor.AddToSolver () (at Assets/Obi/Scripts/Common/Actors/ObiActor.cs:348)
Obi.ObiActor.OnEnable () (at Assets/Obi/Scripts/Common/Actors/ObiActor.cs:323)

Hello guys,

I need your help to find out if it's possible to create an Obi Rope between 2 trackers?
The idea is to make an extinguisher with a tracker on the "body" of the extinguisher, and an extinguisher at the end of the extinguisher nozzle with a hose connecting the 2 ends. As shown in the photo.

Has anyone tried this before? Do you have any advice for this particular case? I'm sure I'm not the first person to want to create a flexible linked by 2 trackers  .

I have a scene set up similarly to the chain sample scene, with a chain attached statically to the ceiling at one end, and dynamically to a rigidbody at the other. In the editor they appear like:
   

Upon running the game with gravity disabled on the body, the chain is stretched down a bit:
   

If gravity is enabled on the dynamic body, the chain stretches down further, and the body becomes slightly disjointed from the chain:
   

Each time the root object containing the solver, chain, and body is disabled and subsequently reenabled, the body becomes further disjointed by the same amount:
       

This behavior can be replicated by manually disabling / enabling the chain and ball while running the chain sample scene. In my case, I can compensate for the initial disjoint by shifting the body up slightly in the editor, but I'm having trouble preventing the further disjoint on re-enable. Is there a recommended way to prevent/mitigate this behavior?

Hello! I am using ObiRope to simulate fishing rod with reel. 

What i have: 
1. Cursor to resize my rope when the player reel in.
2. Hook. Just rigidbody attached dynamically with ObiParticleAttachment at the end of the rope. Static attachment at the fishing rod top point.

I apply force to fishing hook when player cast or fish move with hook. After that my rope will be stretched and i want to prevent this by giving extra length. How can i get the speed of first 1-2 rope particle point and also tension force? How can I compare the current rope tension with the tension at rest? I need these values to calculate resize speed and make more realistic fishing rod behaviour. Or maybe there is other solution for my case?

Thanks for your advices!