(08-12-2020, 09:40 AM)josemendez Wrote: Hi there,

Can't reproduce the first error, either in a blank project or updating from 5.3 to 5.6.2. Make sure you don't have configurable enter play mode options enabled, as these aren't supported.

Regarding the shader error: if you're not using URP, you can just get rid of the Assets/Obi/Resources/ObiMaterials/URP folder. These materials are meant for URP support.

(08-12-2020, 03:26 PM)emz06 Wrote: The null argument error only happens in my current scene. But it does not happen if I open the demo scenes, or if I create a new scene, and place my prefab'ed solver from the problematic scene.

Does that give a clue of what is wrong?

Quote:ObiTriangleMeshHandle handle = new ObiTriangleMeshHandle(null);

if (source != null && !handles.TryGetValue(source, out handle))
{

(08-12-2020, 03:29 PM)josemendez Wrote: Do you have references to null meshes in your scene? For instance, a MeshCollider taking no mesh as input? I think this might be a bug in Obi, caused by null meshes being passed to the collider system.

Edit: this is a bug in Obi indeed. Having a MeshCollider with no mesh input in the scene triggers it. To fix it, modify the GetOrCreateTriangleMesh() method in ObiTriangleMeshContainer.cs so that it starts like this:


Edit2: seems like this fix isn't working properly in some cases. Will spend a bit more time investigating and get back with a more robust fix.

Thanks for reporting this!

(08-12-2020, 04:52 PM)emz06 Wrote: Thanks for that.
I did check all my mesh colliders, and I didn't find one which was null.

Even with your modification, I am getting a NullReferenceException *at the same moment* that I press the Play button (that is: BEFORE the scene is played):
(then I get this exception once per frame)


NullReferenceException: Object reference not set to an instance of an object
Obi.ObiParticleRenderer.get_ParticleMeshes () (at Assets/Obi/Scripts/Common/Rendering/ObiParticleRenderer.cs:27)
Obi.FluidRenderingUtils.VolumeReconstruction (UnityEngine.Rendering.CommandBuffer cmd, Obi.FluidRenderingUtils+FluidRenderTargets renderTargets, UnityEngine.Material thickness_Material, UnityEngine.Material colorMaterial, Obi.ObiParticleRenderer[] renderers) (at Assets/Obi/Scripts/Fluid/Rendering/FluidRenderingUtils.cs:137)
Obi.ObiFluidRenderer.UpdateFluidRenderingCommandBuffer () (at Assets/Obi/Scripts/Fluid/Rendering/ObiFluidRenderer.cs:118)
Obi.ObiBaseFluidRenderer.OnPreRender () (at Assets/Obi/Scripts/Fluid/Rendering/ObiBaseFluidRenderer.cs:80)
UnityEngine.GUIUtility: ProcessEvent(Int32, IntPtr) (at /Users/bokken/buildslave/unity/build/Modules/IMGUI/GUIUtility.cs:197)

EDIT:
I think it has to do with the script ObiKinematicVelocities.cs, which seems to have been removed in the new version.

I was using this on one of the objects, because I had a fast moving platform, moving sideways, and I wanted to translate the particles on that platform. 
Is there an alternative to ObiKinematicVelocities.cs?

Quote:## [5.6.1]

### Fixed
- Bug in Burst backend: solver bounding box size was typically underestimated.
- Bug in Burst backend: when using volume constraints: "InvalidOperationException: The NativeContainer ApplyVolumeConstraintsBatchJob.particleIndices has not been assigned or constructed"
- Bug in Burst backend: not releasing native arrays when empty solvers -with zero actors in them- are present in the scene.
- Bug in Oni backend: volume constraints not working properly when multiple actors are present in the solver.
- Fixed crash when using ObiLateUpdater or ObiLateFixedUpdater with the Burst backend.
- Reduced GC allocation in dynamic particle attachments.
- Fixed bug in Skin constraints, that caused them to fail restricting particle movement in certain circumstances.

### Changed
- Updated Oni iOS library to XCode 12.1. Make sure to use XCode 12.1 or up to build for iOS when using the Oni backend.
- ObiKinematicVelocities component has been removed. Its functionality is now built into the engine, and automatically used for kinematic rigidbodies.

### Added
- Sample ObiContactDispatcher component, that will call custom enter/stay/exit contact events.
- Support for multiple solvers in sample script in ObiContactGrabber.
- Added util LookAroundCamera component.