Placement works by detecting when a block entity is placed containing a specific item. The full list of supported block entities can be found here.

Setup

The item

1. Pick your block entity of choice
2. Give it the proper nbt, replacing example:test with your block’s id

{BlockEntityTag:{Items:[{id:\"minecraft:stone\",Count:1b,Slot:0b,tag:{smithed:{block:{id:\"example:block\"}}}}]}}

Handle the placement

1. Create a main handler function, this function runs at the block that was placed. The original blocks information is preserved, thus checking its block state is possible.
   • Example:

@tag smithed:core/place_block
execute if storage smd:core blockApi{id:”example:test”} run function {
    summon armor_stand ~ ~ ~
    setblock ~ ~ ~ barrel replace
}

I recommend placing all of your block placement logic within this handler function

Troubleshooting

If a particle appears when the block is placed, that means your pack isn’t handling the original block entity properly. Setting your smd.logLevel to atleast 1 will show you the warning message in chat.