Decal to show on asset set NOT to render on main pass?

Hi folks,

I’d like to have an translucent cylinder that receives translucent decals. Knowing that’s not possible, I tried to make a duplicate that had an opaque shader set to not render in main. That should keep it collidable, but it’s not drawing to the buffer, so no luck there. I found something about turning on Render Custom Depth, but it was always for some sort of outline shader or a “silohuette of the mesh” implementation, not a standard decal. Does anyone have an insight?