Whitelist ParticleSystemForceField component for avatar/world interaction.
The ParticleSystemForceField component new to Unity 2018, combined with "external forces" module can open up a whole new breadth of avatar/world interactions not seen since Ik controlled GPU Particles. Mimi made an example showing what this component can do: https://i.imgur.com/yglb74H.gifv For the module to be useful, it must be allowed on avatars so that (combined with IKFollower) leg and arm positions can emit forces. Doing so can enable new types of 30dof interactions not seen before between avatars or between avatars and particle systems in worlds. Worlds that wish to block avatar particle interactions must only uncheck avatar layers including Player, MirrorReflection etc. For this reason it should be safe to allow avatars to carry this component without impeding world creation. https://docs.unity3d.com/2018.4/Documentation/Manual/class-ParticleSystemForceField.html
 Client Hang on Exit
When closing the client (tested closing from in-game menu) VRChat seems to go through the motions of a proper shutdown (avatars despawn for a few frames and then I'm kicked back to SteamVR) but the app remains unresponsive on the desktop. It requires a manual task kill to fully exit. Probably a known issue but just adding it here for issue tracking.
 Changing the animation with slider don't work
the problem is that in vrchat that does not work now, the utilities of this are many, such as changing the weight of the postprocessed with a slider, or rotating objects with slider, this only occurs in vrchat, in unity it works correctly. expected: https://gyazo.com/1156dbd8803fd302ee1ae2d8fa2dc7f4 in vrchat: https://gyazo.com/281a4fdec21cbca6d205829dffe4774b id of the testing world: https://vrchat.com/home/world/wrld_f6c2e33f-9552-4949-82e3-fc5b02197290 How does the system work: https://drive.google.com/file/d/1nPdNMcuvgysUgCvxxrxXfrhpao1l268F/view?usp=sharing
 Some shaders on non-2018 content do not appear correctly
Avatars with standard unity shaders uploaded from previous versions are now invisible. Avatars with poimoi and certain other custom shaders are now invisible as well. But certain other shaders such as a custom matcap shader I bought from the unity store still works. It might be the shaders themselves not being designed for this version of unity, but I am not sure.
https://docs.unity3d.com/Manual/Constraints.html This system seems to be far better suited to perform a lot of task previously accomplished with other comments, while providing additional options for avatar creators Allows limb copying without fixed joints (allowing avatars with multiple arms or legs) Allows using world particles in situations that IKFollower doesn’t allow (Attach to non-IK-following bone) that previously required fixed joints I believe these allow you to Animate holstering / unholstering weapons without needing to duplicate the mesh (IIRC, FinalIK supported this) Aim/LookAt constraints can be used to replicate hydraulics pistons or other mechanical joints for robotic avatars (previously this could be achieved with dynamic bones any maybe FinalIK) These components likely can be used to achieve other effects. These components hopefully won’t have the disadvantages of the systems they replace, such as; IKFollower: only allowed on IK-following bones (As per documentation) Rigid Bodies: Known to break in Combat enabled worlds (https://vrchat.canny.io/bug-reports/p/avatar-rigid-bodies-break-in-combat-enabled-worlds) Rigid Bodies: Some configurations of joints can drift out of place over time or during teleports.
 Periodic hitch in all worlds
There is a periodic hitch that happens once every second on the 2018 open beta. This hitch happens in all worlds, but gets worse if you are in a world with many objects or have many avatars loaded. The hitch is quite noticeable in worlds with more than a few hundred objects in the scene. I took some graphs of frame time using Intel GPA. The world I tested in just has a few lightmapped meshes: wrld_83a2a007-0d76-45e2-9607-fb97320933d6 this can be repro'd in all worlds I have visited and happens regardless of the avatar I am in as well. Re-uploading the world on 2018.4.9 does not seem to change the hitching. The first attached screenshot is on live and the second is on the 2018 beta.
Worlds using Substance Designer materials causes scene to fail to load (Only happens in VRChat)
This involves any world updated to 2018 using substance designer materials and would get this error: ERROR: Built-in support for Substance Designer materials has been removed from Unity. To continue using Substance Designer materials, you will need to install Allegorithmic's external importer from the Asset Store Should be fixable on VRChat's end as for my projects files is using the importer and loads the scene no problem and i am sure its fixable on VRChat's End.