Currently there's some issues with showfake, and in general it's pretty complex handling with directly editing the chunk packet's data and all.
With bundle packets now being a thing, it's possible to bundle together the original chunk packet with separate block change packets for the fake blocks, which seems to fix the tile entity issue & looks a lot cleaner imo.
I've used ClientboundSectionBlocksUpdatePacket instead of just normal block change packets, to be a little more efficient with large amounts of fake blocks - currently it sorts the blocks into sections every single time, but can store them per section in FakeBlockMap to avoid that.
As for performance, I've done some stress testing with ~100k fake blocks and it seemed to work fine (albit on a local server lol, but this is a pretty extreme case anyway).
Currently there's some issues with showfake, and in general it's pretty complex handling with directly editing the chunk packet's data and all. With bundle packets now being a thing, it's possible to bundle together the original chunk packet with separate block change packets for the fake blocks, which seems to fix the tile entity issue & looks a lot cleaner imo. I've used
ClientboundSectionBlocksUpdatePacketinstead of just normal block change packets, to be a little more efficient with large amounts of fake blocks - currently it sorts the blocks into sections every single time, but can store them per section inFakeBlockMapto avoid that.As for performance, I've done some stress testing with ~100k fake blocks and it seemed to work fine (albit on a local server lol, but this is a pretty extreme case anyway).