Oooh! I was thinking this kind of feature could be handy.

@Scooby: I'm still trying to track down why that happens, but I've always found the ghost blocks disappear after saving and reloading.

@legendary kotus: N toggles mirroring (same as Creative's keybind)

Warning as this mod may break you build. I was placing blocks in mirror mode too fast. One side was not placing, normally means next level will not place or be floating. Well with this mod you get a ghost block that can not be removed in any way. Trying to remove the mod now in hopes that the 3hrs of work already into the build is not lost. Can not build off the block and says grid will split when attempt to grind it with the grinder doing nothing.

How to turn it off

so far so good, it certainly works on my server!
but i found a issue. since we have the build info mod installed, which allows us to place blocks further away from us by holding ctrl + scrol (up/down), this mod stops working once we start placing blocks too far away from the character. is there a limit that disables mirror placing once the block gets placed too far away from the engineer?

Im assuming theres no way to fix the fact that blocks that have a "mirror" variant cant place themselves on the other side

@Ernos: I haven't ran into any problems placing single blocks (multiblocks continue to be a hassle), even at speed, but I mostly play on my local dedicated server (so no network ping), I wonder if your mirror failures might be ping related? The mirroring logic (including initial checks if the place is occupied / has neighbours) is triggered clientside before telling the server to spawn it, so if thats not how the vanilla game places blocks, if you have high ping, maybe your client doesn't think your block is placed yet? Just guessing.

If you can narrow down under what circumstances it happens, I might be able to fix.

hey I'm using this for a large build, and I'm having to place blocks fairly slowly, like half as fast as I could without this mod, otherwise it is just failing to mirror the block. Not sure if this is a limitation of Space Engineers or of how the mod is implemented.

Otherwise though, this is a great mod and I'm really appreciating it, as I really care about symmetry and don't like having to redo large chunks because I was off by one when replicating a structure on the opposite side of a ship.

Absolute Chad Engineer for updating this!

Awesome! TY.