This is called before an entity is rendered.
If cancelled, the entity is not rendered.
This field defines whether the event is cancelled or not. Any mod can cancel and un-cancel an event. What an event does when cancelled is event-specific, and noted in that event's documentation.
The entity being rendered.
The x coordinate where the entity is being rendered this frame.
x
The y coordinate where the entity is being rendered this frame.
y
The z coordinate where the entity is being rendered this frame.
z