Need help, Material not chagning with map IDs

I’m having trouble following this video. I’m trying to assign material IDs in the last part at 4:15, but nothing changes. The material is still staying on top of everything instead of only the parts that should be assigned. On top of that the ID map isn’t displaying correctly when i check it. Anyone know what could be wrong

I had the same problem, and a comment in the video you linked to helped me resolve it! So thanks for that!

The Youtube user MrParanoia says: “Edit Materials Setting” and set material to “Transparent”.

Apparently, according to MrParanoia, this won’t work on displacements and normals(?), but that wasn’t an issue on my side.

Good luck!

that caused the material ids to work, but they’re still in the wrong places