Bug Description
The AltModelBlockRenderer that Sodium returns from Renderer.get().altModelBlockRenderer() seems to not respect the ambientOcclusion parameter passed in, and unconditionally emits quads which are shaded by cardinal direction, but lack any form of ambient occlusion baked into the vertex colors. This behavior differs from Indigo's AltModelBlockRenderer implementation, which bakes the AO into the vertex colors the way I would expect it to.
Screenshot when using Indigo:
Screenshot when using Sodium:
This issue affects sodium-fabric-0.8.9+mc26.1.1.jar, and possibly earlier versions that I didn't test.
Reproduction Steps
The above screenshots were from my LOD terrain renderer, but a more minimal stand-alone class which demonstrates this issue can be found here: AOTest.java
Upon calling capture(), it will create a Mesh containing the geometry of the blocks in an 11x11x11 block area centered around the player, and start rendering it 20 blocks above the player's location at the time of capturing. The mesh can then be inspected visually to see whether or not it has the correct AO everywhere.
Log File
latest.log
Crash Report
crash-2026-04-12_23.59.07-client.txt
Bug Description
The AltModelBlockRenderer that Sodium returns from
Renderer.get().altModelBlockRenderer()seems to not respect theambientOcclusionparameter passed in, and unconditionally emits quads which are shaded by cardinal direction, but lack any form of ambient occlusion baked into the vertex colors. This behavior differs from Indigo's AltModelBlockRenderer implementation, which bakes the AO into the vertex colors the way I would expect it to.Screenshot when using Indigo:
Screenshot when using Sodium:
This issue affects
sodium-fabric-0.8.9+mc26.1.1.jar, and possibly earlier versions that I didn't test.Reproduction Steps
The above screenshots were from my LOD terrain renderer, but a more minimal stand-alone class which demonstrates this issue can be found here: AOTest.java
Upon calling
capture(), it will create a Mesh containing the geometry of the blocks in an 11x11x11 block area centered around the player, and start rendering it 20 blocks above the player's location at the time of capturing. The mesh can then be inspected visually to see whether or not it has the correct AO everywhere.Log File
latest.log
Crash Report
crash-2026-04-12_23.59.07-client.txt