Struct ItemAfterVerticalCollisionEvent 

pub struct ItemAfterVerticalCollisionEvent<'a> {
    pub dimension: &'a str,
    pub client: bool,
    pub entity: u32,
    pub state: BlockState,
    pub block_pos: [i32; 3],
    pub item_pos: [f64; 3],
    pub stack: &'a mut Option<ItemStack>,
}

What BlockPart::item_after_vertical_collision is told. Each field is that hook’s argument of the same name, described in the hook’s doc.

Fields

dimension: &'a str

client: bool

entity: u32

state: BlockState

block_pos: [i32; 3]

item_pos: [f64; 3]

stack: &'a mut Option<ItemStack>