I am not sure if you will fix this, but I just want to say that immersive portals (https://www.curseforge.com/minecraft/mc-mods/immersive-portals-mod) is incompatible. When you load up the mod with this mod it looks like this mod is just disabled and no visible changes will get made.

0.52 of IP came out, and I can say that the mods are definitely no longer incompatible, although it's still not perfect:

@qouteall
Can you not just re-use the main render's view & projection matrices, and only override location of the former one and offset rotation? Regardless, thanks a lot.

I wrote you a reply on the curseforge page, but fixing this caused an issue when using both mods: the camera shakes rapidly in backwards third-person mode. This did not occur prior to the Immersive Portals fix.

I wrote you a reply on the curseforge page, but fixing this caused an issue when using both mods: the camera shakes rapidly in backwards third-person mode. This did not occur prior to the Immersive Portals fix.

I was about to report this as well.

IP overrides the transformation for two things: 1. Change the camera transformation for portal rendering 2. Display the rotation animation after the player cross a portal with rotation transformation that make the immediate camera pose an illegal camera rotation.
I can disable that transformation override when not rendering portal and no rotation animation is being performed

I noticed that this mod provides an event for changing camera but I prefer quaternion over Euler angle

Maybe fixed in the next version of IP