On a side note, is there any real difference between atom smashing and dumping something into the magma sea to melt into the SMR?
I am pretty sure that both situation erase the item from existence. However there is one benefit of an atom smasher in that it does not require tunneling thirteen brojillion feet down into the ground through multiple layers of DOOM in order to get rid of a few unwanted doodads...
The difference is that any magma-proof items you dump won't get destroyed, so the game will still keep track of it, and you lose out on the benefit of getting rid of the stuff to begin with.
Yes and no.
SMR is funny stuff.
1) If you dump something onto a tile that has magma
and SMR it will completely vanish, the same as atom smashing it or chucking it into a chasm. It falls off the map. Its gone forever.
2) If you dump something onto a tile with magma where the
floor is not SMR then if it is not magma safe it will be incinerated. Wood will burn away to nothing, but iron or steel will sit there.
3) If you dump something onto a tile
without magma but with SMR, nothing will happen. It just sits there. Dorfs can even walk across the SMR without suffering any injuries. Its just a regular floor.
I've verified this stuff in my misadventures of building magma disposal chutes, my prefered method of garbage disposal. Its entirely automatic once its set up, you don't even need a lever puller or repeater, just dig down into the magma ocean above SMR, so the tile the object lands on has both magma
and SMR and its gone forever. It has to have both. If it has magma but not SMR it won't work. If it has no magma but SMR it won't work. Needs both.