Is it a mod compatibility issue?

No

Minecraft version

1.20

Describe the issue

hi, when using this cool mod and a iris shader like the one i am using SEUS PTGI HRR 3 and Vanilla PBR texture pack does the portal view clip through everything and also when holding something in the hand like a sword and looking slightly up do portals get cut through.

here are example images:
with shader and Texture pack:

without a shader still iris:

and straight on the portal with shader Texture pack:

here with shader and default texture pack:

i have no idea on how to fix it but i think it's something to do with shadow maps that iris shader makes that shaders use.
i hope it's helpful in some way

ImmPtl is incompatible with path tracing shaders.

I am going to add PTGI into warning list

is it compatible with optifine? i only have used iris because of it'S intigrated in the launcher i use Prism Launcher

is it compatible with optifine? i only have used iris because of it'S intigrated in the launcher i use Prism Launcher

Immersive Portal is not compatible with Optifine

good to know