Updated Gaia Pro to 3.4.1 and it broke grass

[GH Games]

Hi, I update Gaia Pro 2021 today to 3.4.1 after updating my Unity to 2023.1.5f1 and HDRP to version 15.0.6 and ever since the grass in my scenes has looked like the image below.

The "Insert image from URL" seems to be broken so I have to post the link.

https://pasteboard.co/UpOMEzbS46Xl.png

Anyway, does anyone know what is happening and/or how I can go about fixing it?

Thank you.

[Peter]

Hi @GH Games, this is a bug in the newer unity / hdrp versions unfortunately. We spent quite a bit of time investigating this over here in this thread:
https://canopy.procedural-worlds.com/forums/topic/747-grass-not-rendering-properly/#comment-9156

What we found was that this happens because HDRP Motion vectors are not calculated correctly anymore when the terrain is not aligned at x=0, y=0, z=0. This happens with the unity terrain detail system as well. Unity has confirmed this is a bug, it is being tracked here:

https://issuetracker.unity3d.com/issues/hdrp-motion-vectors-are-wrong-for-terrain-not-positioned-at-the-origin-when-built-or-in-play-mode

The thread linked up above mentions two workarounds: Deactivating Motion Blur in Post-Processing, or deactivating Motion Vectors altogether, however this creates issues with other elements that require Motion Vectors e.g. Temporal Anti Aliasing.
 

 

[GH Games]

@Peter thank you very much for the reply, I disabled motion blur and it works perfectly now 🙂

[Bryan]

Thank you for the update!