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The Iris Project•2mo ago•

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Iris shaders (Bliss/Photon): Blockbench 3D item model visible in first-person but invisible in third

Hi! I’m making a custom 3D item model (Blockbench → Java model JSON) on Minecraft Java 1.21.11.

What I’m trying to do

I have a custom model (minecraft:item/guitar) used for an item (iron_axe via item model dispatch).
The model renders fine in first-person, but it becomes invisible in:
- third-person
- dropped item (as an entity on the ground)
- item frames

This happens only when using shaders. Without shaders it looks normal.

Environment

- Minecraft Java: 1.21.11
- Shaders: Bliss, Photon (both show the same issue)
- Shader loader: Iris (and Sodium)
- Resource pack: custom (contains assets/minecraft/models/item/guitar.json)
- Model was created in Blockbench

What I already tried

- render_type: "solid" (no change)
- The model is visible only in first person, so it’s not a missing-file issue.

Suspicions / questions

Could this be related to:
- thin geometry / zero-thickness elements

If anyone knows how to make a 3D item model render correctly in third-person + dropped item + item frame with Iris shaders, please let me know

If you need additional files, I can share my iron_axe.json (item model dispatch) and pack structure too.