Blocks

Blocks do a lot in Minecraft, given that it’s a voxel-based world. In most cases, when a block is placed or mined, the server needs to reply with a block change packet.

If this packet isn’t sent, the client just assumes the packet was dropped or the client wasn’t allowed to place the block, replacing it with air after a second or two.

1. Breaking
2. Placing

Breaking

Packet	Contents
C->S Mine	Telling the server to destroy a block
S->C Block Change	Tells the client a block was changed

Placing

Packet	Contents
C->S Place	Telling the server to place a block
S->C Block Change	Tells the client a block was changed